Entries |
Document | Title | Date |
20080221762 | Method and Device for Controlling a Standstill Circuit of an Automatic Transmission - The invention relates to a method and a device for controlling a standstill circuit of an automatic transmission of the vehicle, comprising a decision unit for selection of the target gear, a low-speed monitoring unit and a standstill circuit, which, when the vehicle is standing still or when its speed falls below a predetermined limit speed, brings about or prepares the activation of a starting gear. | 09-11-2008 |
20080288146 | SYSTEMS AND METHODS FOR DETECTING AND REDUCING HIGH DRIVELINE TORSIONAL LEVELS IN AUTOMOBILE TRANSMISSIONS - The present disclosure provides systems and methods to detect and reduce any high driveline torsional levels, such as due to the cylinder deactivation in variable displacement system engines or aggressive lock-up strategies for fuel efficiency, in automobile transmissions. The present disclosure utilizes a controller in an automobile to operate a computationally thrifty method for quickly detecting noise and vibration disturbances in the transmission. This quick detection enables fuel economic calibrations that aggressively reduce the disturbances by controlling slip in a launch device of the transmission. As problem disturbances arise, they are detected before occupants notice objectionable behavior. Once detected, the disturbances are reduced, such as by increasing launch device slip, which effectively intercepts the objectionable disturbances before they are transferred through the entire drivetrain. The present disclosure can also apply to launch devices in Dual Clutch Transmissions and Electronically-controlled Manual Transmissions. | 11-20-2008 |
20090005942 | Method for Controlling an Automatic Transmission - An automatic transmission control method in which at least one of a starting clutch, a clutch coupling and transmission elements, for selection as well as engagement and disengagement of a gear step, are determined as a function of respectively existing variables representing the driving situation as well as the driver's wishes can be activated by actuators which are controlled by a control and regulation device. The method comprising the steps of collecting and normalizing the input variable into standard input variables; weighting with weighting factors and summarizing; converting the weighted input variables into intermediate variables; selecting a specific range of values which represents a specific shifting sequence; and implementing the shifting operation. | 01-01-2009 |
20090076694 | CONTROLLER OF DRIVER FOR VEHICLE - A control apparatus for a vehicular drive system arranged to electrically transmit a portion of an output force of an engine through an electric path, which control apparatus is configured to reduce loads of components associated with the electric path and to restrict a temperature rise of the components associated with the electric path, making it possible to reduce the required size of a cooling system. | 03-19-2009 |
20090222179 | DYNAMIC LEARNING OF SOLENOID P-I CURVES FOR CLOSED LOOP PRESSURE CONTROLS - In a pressure control system having a solenoid-operated fluid valve that has an output hydraulic pressure which varies in accordance with a solenoid input signal, a dynamic learning block is configured to adjust the initial, default values for control points stored in a pressure-current (P-I) data table based on observed (measured) operating points that reflect the solenoid's actual transfer characteristic. A feed forward control block is configured to generate the solenoid input signal having a level based on the adjusted control points in the data table, which improves the accuracy of the solenoid input signal. An adjustment method uses a plurality of circular buffers each configured to store observed operating points falling within a respective range, and provides a mechanism to allow adjustment of the control points based on only partial data. | 09-03-2009 |
20090248264 | CONTROL APPARATUS FOR AUTOMATIC TRANSMISSION - Strain gauges and a torque value calculating unit detect a torque value acting on a sun gear based on a reaction force. An input equivalent value calculating unit calculates an input torque equivalent value based on the detected torque value, and a hydraulic pressure control unit controls output from a starting clutch by controlling operation of a hydraulic servo, based on the input torque equivalent value calculated by the input equivalent value calculating unit. Therefore, by measuring the input torque equivalent value derived from a value for torque acting on the fixed sun gear in an automatic speed change mechanism and then monitoring the input torque equivalent value as a target input torque, the control unit precisely controls the hydraulic pressure to the starting clutch FB control. | 10-01-2009 |
20090259374 | METHOD OF CONTROLLING A TRANSMISSION RATIO - The invention relates to a method for controlling a transmission ratio (r) of a continuously adjustable transmission ( | 10-15-2009 |
20090265067 | Method for Controlling Shifting of a Stepped Automatic Transmission - A method for controlling gear shifts in an automated stepped gear transmission of a motor vehicle in which operating parameters of the motor vehicle are continuously determined and evaluated for initiating and carrying out a shift from a currently engaged gear to a target gear such that, before a shift, the shift speed for initiating the shift and the target gear are determined. For better adaptation of the shift, in particular the determination of the shift speed and the target gear, to the current driving and operating conditions of the motor vehicle, the shift types “shift-speed-orientated shift” and “target-speed-orientated shift” are provided and, immediately before a shift operation, it is decided, as a function of at least one of the operating parameters in which, of the two shift types, the shift is to be carried out. | 10-22-2009 |
20090312924 | Control device and control method for vehicle - When an automatic transmission is shifted from neutral to a a forward gear, an ECU calculates the appropriate target gear. If the target gear speed is the second forward gear or higher, a target command pressure of a first engagement element is immediately increased to a maximum pressure regardless of an input torque, and a target command pressure of a second engagement element is gradually increased in accordance with the input torque. | 12-17-2009 |
20090312925 | TORQUE CONVERTER CONTROL DEVICE AND CONTROL METHOD THEREOF - When an upshift is performed while a traveling condition of a vehicle corresponds to a driving condition or a downshift is performed while the traveling condition of the vehicle corresponds to a coasting condition, a second target slip amount is set as a target slip amount for a period extending from the start of gear ratio variation following issuance of a gear position change start command to completion of the gear ratio change, and when a downshift is performed in the driving condition or an upshift is performed in the coasting condition, a first target slip amount is set as the target slip amount for a period extending from issuance of the shift command to completion of the shift. | 12-17-2009 |
20090319141 | AUTOMATIC TRANSMISSION CONTROL APPARATUS AND METHOD - During control of a shift of a first friction engagement element from an engaged state into a disengaged state and a shift of a second friction engagement element from a disengaged state into an engaged state for a gear shift to a first target gear from a second target gear, a desired torque capacity of the first friction engagement element is set based on an actual transmission gear ratio by interpolation from values of the desired torque capacity corresponding to at least first and second reference transmission gear ratios, wherein the first reference transmission gear ratio is a transmission gear ratio at start of an inertia phase of the shift control. When the first reference transmission gear ratio is between the actual transmission gear ratio and the second reference transmission gear ratio, the desired torque capacity is set to the value corresponding to the first reference transmission gear ratio. | 12-24-2009 |
20090319142 | SPEED CHANGE CONTROL SYSTEM OF AUTOMATIC TRANSMISSION - When it is judged that a vehicle speed detected by a vehicle speed sensor is equal to or lower than a predetermined very low value, that is, for example, 5 km/h, the hydraulic pressure applied to an engaging-side frictional element is sharply increased, sharply reduced and then held higher than a given value capable of effecting a piston stroke of a corresponding piston unit until a time when the piston stroke is completed. Upon completion of the piston stroke, the hydraulic pressure is increased to a 10 maximum value in a time that is smaller or shorter than that set when the detected vehicle speed is higher than the predetermined very low value. | 12-24-2009 |
20100004833 | Vehicle and control method thereof - When the detected value of a rotation speed sensor is normal, it is determined whether or not a vehicle is stopping by using a predetermined rotation speed N | 01-07-2010 |
20100017080 | CONTROL APPARATUS, CONTROL METHOD, AND COMPUTER-READABLE STORAGE MEDIUM FOR CONTINUOUSLY VARIABLE TRANSMISSION - A control apparatus for a continuously variable transmission includes a clamping force increase portion. The continuously variable transmission includes a pair of a primary pulley and a secondary pulley on which a transmission belt is wound. A shift of the continuously variable transmission is performed by changing effective diameters of the primary pulley and the secondary pulley. The clamping force increase portion increases a belt clamping force when it is determined that a torque capacity is decreased by determining that drive power input to the primary pulley is decreased by an amount equal to or larger than a predetermined amount while the secondary pulley is in a stopped state or a substantially stopped state, as compared to when it is determined that the torque capacity is not decreased. | 01-21-2010 |
20100017081 | METHOD FOR CONTROLLING A CONTINUOUSLY VARIABLE AUTOMATIC TRANSMISSION FOR A MOTOR VEHICLE - A method for controlling a continuously variable automatic transmission for a motor vehicle, equipped with a forced downshift device known as a kick down implemented by the driver fully depressing the accelerator pedal to obtain the vehicle's maximum acceleration, and with an electronic engine management system. The method determines the engine speed at which maximum engine power can be obtained, as a function of an operating state of the engine and of components connected to the engine, for example a particle filter, and as a function of environmental conditions outside the vehicle, for example the altitude during kick down procedures. | 01-21-2010 |
20100042300 | METHOD FOR CONTROLLING AND/OR REGULATING AN AUTOMATIC GEARBOX - A process of controlling and/or regulating an automatic transmission in which a predetermined shifting speed of the gear shift is carried out and adjusted during a shift program, and in which the detection of a constant-speed driving of the vehicle is carried out at least during the shift program. | 02-18-2010 |
20100042301 | SPEED RATIO CONTROL DEVICE AND METHOD FOR WORKING VEHICLE - A working vehicle that uses the output of an internal combustion engine ( | 02-18-2010 |
20100057315 | AUTOMATIC TRANSMISSION SYSTEM AND HYDRAULIC CONTROL DEVICE AND METHOD THEREOF - An automatic transmission system includes a transmission having transmission elements with lubrication-requiring portions and hydraulic actuators therefor, a switching valve that supplies hydraulic fluid to the hydraulic actuators, a valve actuator that actuates the switching valve, a shift range detection unit that detects a selected shift range of the transmission, and a control unit that controls the valve actuator to actuate the switching valve in accordance with the selected transmission shift range. The switching valve has a bypass position to provide a supply of the hydraulic fluid to the lubrication-requiring portions by bypassing a transmission oil cooler. The control unit judges whether the transmission is in a low lubrication state based on a given operating parameter of the transmission and controls the valve actuator to switch the switching valve to the bypass position at the time the transmission is judged as being in the low lubrication state. | 03-04-2010 |
20100076653 | METHOD FOR CONTROLLING A DRIVE TRAIN OF A MOTOR VEHICLE - A method of controlling a drivetrain of a vehicle in which the drivetrain comprises a motor, a transmission with starting gears and a clutch located between the motor and transmission, a manual shift lever, and a control unit, for controlling the transmission and clutch, that communicates with a speed sensor, and an accelerator pedal and shift lever actuation sensors. When starting off from coasting, a starting gear is determined in a manner that can be influenced by the driver via actuating the manual shift lever. To assist the driver, it is checked whether the transmission is in neutral and the clutch is engaged, if the vehicle speed is within a specified speed range. If so, the clutch is disengaged, another gear is engaged, and starting is initiated in combination with situation-dependent clutch engagement and carried out as a function of accelerator pedal actuation, provided the shift lever has not been actuated. | 03-25-2010 |
20100082208 | CONTROL SYSTEM FOR AUTOMATIC TRANSMISSION - An automatic transmission control system calculates a sustention output, needed to sustain a vehicle speed, based on the running resistance, calculates a request output based on, for example, an accelerator pedal angle, calculates a current gear ratio maximum output, which is a maximum output of a vehicle at the current gear ratio, based on the maximum output performance of the engine, and also calculates a post-upshift maximum output that is the maximum output of the vehicle at a gear ratio resulting from an upshift. When a first value based on the sustention output, request output, and a reserve output becomes larger than a second value based on the current gear ratio maximum output, a downshift is decided. When a third value based on the sustention output, request output, and reserve output becomes smaller than a fourth value based on a post-upshift maximum output, upshift is decided. | 04-01-2010 |
20100087996 | Apparatus and Method for Regulating Active Driveline Damping in Hybrid Vehicle Powertrain - The present invention provides an improved method and apparatus for regulating active damping in a hybrid vehicle powertrain. The method includes: monitoring the damping command sent to the active damping system; determining a mean reference point, which may be a filtered value of the damping torque command; determining if the unfiltered damping torque command value switches from one side to the other of the mean reference point; if a switch is detected, determining if the size of the switch exceeds a predetermined minimum; if it does, then increasing a total number of switches; determining if the total number of switches exceeds a switch threshold; if the total number of switches exceeds the switch threshold, determining if the current damping torque exceeds a damping torque threshold; and decreasing the damping torque if the total number of switches exceeds the switch threshold and the current damping torque exceeds the damping torque threshold. | 04-08-2010 |
20100121544 | DRIVING POWER DISTRIBUTION CONTROL APPARATUS, DIFFERENTIAL LIMITING CONTROL APPARATUS, METHOD FOR CONTROLLING TORQUE COUPLING, AND METHOD FOR CONTROLLING DIFFERENTIAL APPARATUS - A driving power distribution control apparatus includes a torque coupling and an ECU. The torque coupling is provided in a drive power transmission system that transmits torque of an engine to each of a plurality of wheels. Based on the frictional engaging force of an electromagnetic clutch, the torque coupling is capable of changing the amount of torque that can be transmitted to right and left rear wheels, which serve as auxiliary drive wheels. The ECU controls the operation of the torque coupling based on the driving state of the vehicle. When slip of any one of the wheels is detected, the ECU reduces the torque transmission amount to a predetermined torque or a lower value. | 05-13-2010 |
20100125397 | DRIVE LINE OPERATION METHOD - The invention concerns a method for operating a vehicle drive train, whereby the drive train comprises a drive unit, a transmission, and an all-wheel splitter having an automatically operating clutch, positioned between the transmission and the output, whereby the clutch of the all-wheel splitter is operated in a continuous slip mode and in a way that it is splits a transmission output torque in the sense of a variable torque distribution to driven axles of the output, whereby the split of the transmission output torque to the driven axles, is performed by a control unit, being implemented into the all-wheel drive strategy in a way that the transmission output torque, less a predetermined nominal torque being set by the all-wheel drive strategy, is transferred to a first axle, and the nominal torque is transferred to a second axle. In this invention, when defined operating conditions are met, a clutch monitoring function is activated and the nominal torque, set by the all-wheel strategy, is replaced by a torque definition of the clutch monitoring function in a way that, first, the torque which is transferred by clutch to the second driven axle, is increased, then being kept constant, and thereafter again reduced. | 05-20-2010 |
20100131162 | GEAR CONTROL SYSTEM AND METHOD - A gear control system includes a pulse modulating circuit, a motor, and a central processing unit operatively coupled to the pulse modulating circuit and configured to control rotation of the motor from an original gear position to a desired gear position via the pulse modulating circuit. A motor position detecting device is operatively coupled to the central processing unit and detects the motor rotation position and transmits the motor position information corresponding to the motor rotation position to the central processing unit. The central processing unit determines whether the motor has reached the desired gear position based on the motor position information, and actuates the pulse modulating circuit to transmit pulses to actuate the motor to reach the desired gear position when the motor has not reached the desired gear position. | 05-27-2010 |
20100161187 | SHIFT-BY-WIRE DEVICE AND TRANSMISSION DEVICE MOUNTING THEREON THE SAME - A shift-by-wire device including a shaft position sensor that detects a shaft rotating angle, a drive unit that drives an actuator of the shaft, an operational function unit including an operational CPU that receives the shaft rotating angle from the shaft position sensor, receives a shift command from an administrative electronic control unit to transmit the shaft rotating angle of the shaft to the administrative electronic control unit, and controls the drive unit according to the shaft rotating angle and shift command. The device further includes a monitoring function unit including a monitoring CPU that receives the shaft rotating angle in order to monitor whether there is an abnormality in the operational function unit and transmits the shaft rotating angle to the administrative electronic control unit when a detected abnormality occurs in the operational function unit. | 06-24-2010 |
20100168970 | CONTROL APPARATUS AND CONTROL METHOD FOR AN AUTOMATIC TRANSMISSION, PROGRAM FOR DIRECTING A COMPUTER TO EXECUTE THE CONTROL METHOD, AND STORAGE MEDIUM ON WHICH PROGRAM IS RECORDED - An ECU executes a program that outputs a shift command when a determination has been made to perform a power-on downshift (i.e., YES in S | 07-01-2010 |
20100168971 | Control of Multi-Speed Transmission - Apparatus and method for efficiently controlling an automatic transmission in an electric vehicle. The method may be implemented by selection of one of at least two belt clutches having different ratios. The timing for disengagement and engagement of each clutch and the proper sequencing of the disengagement and engagement of the clutches is determined to optimize the efficiency of the transmission. A direct drive motor is directly coupled to the transmission's output shaft to provide momentary power to maintain a nearly constant rate of acceleration during shifting. The method may further be applied for shifting an electric vehicle with a first motor coupled to an output shaft through a single belt clutch and a direct drive motor. | 07-01-2010 |
20100191428 | SHIFT CONTROL DEVICE FOR VEHICULAR CONTINUOUSLY VARIABLE TRANSMISSION - In a shift control device for a vehicular continuously variable transmission with an arrangement in which a normal shift mode is switched to an acceleration shift mode in response to an acceleration demand, a shift control is performed to prevent deterioration to running performance due to a transition to the acceleration shift mode by increased running resistance such as ascending road running or the like against a driver will. | 07-29-2010 |
20100191429 | CONTROL DEVICE OF A CONTINUOUSLY VARIABLE TRANSMISSION - A low-side target gear ratio “alpha” and a high-side target gear ratio “beta” are calculated using an up-use map Ma and a down-use map Mb based on a vehicle speed and an accelerator opening amount, and with regard to a region wherein the target gear ratio “alpha” is not more “high” than an actual gear ratio and the target gear ratio “beta” is not more “low” than the actual gear ratio, a gear ratio of a continuously variable transmission is held. | 07-29-2010 |
20100211276 | CONTROL DEVICE FOR AUTOMATIC TRANSMISSION - In order to realize favorable transmission characteristics in power-off upshift in clutch-to-clutch shift, an ECU detects an upshift request in a power-off state (request of clutch-to-clutch shift), and then outputs a control signal to a hydraulic circuit such that an on-coming clutch is engaged. When the on-coming clutch torque capacity becomes larger than 0 to have transmission torque, a sweep-down control signal is output to the hydraulic circuit such that an off-going clutch is released. | 08-19-2010 |
20100228455 | TRANSMISSION CONTROL MODULE WITH VALVE CONTROL - An exemplary system includes at least one valve configured to control fluid flow in a dual-clutch transmission system. A solenoid is operably connected to the at least one valve and configured to move the valve to a plurality of positions. A primary processing unit is in communication with the solenoid and configured to determine an intended position of the valve. A controller is configured to receive the intended position of the valve from the primary processing unit and generate a primary control signal associated with the intended position of the valve. The solenoid is configured to move the valve to the intended position based on the primary control signal. A secondary processing unit is configured to receive information from the primary processing unit and prevent the primary control signal from controlling the solenoid if the primary processing unit is unable to control the solenoid. | 09-09-2010 |
20100241325 | SYSTEM AND METHOD FOR OPERATING A DUAL CLUTCH TRANSMISSION DURING FAILURE OF AN ENGINE SPEED SENSOR OR A BUS CONNECTION BETWEEN CONTROL MODULES - It is disclosed a system and method for maintaining the operation of an automated transmission ( | 09-23-2010 |
20100241326 | Control apparatus for automatic transmission - A control apparatus for an automatic transmission, the control apparatus includes a main pump that is rotation driven by an engine and supplies hydraulic oil via an oil passage of a vehicle automatic transmission; an auxiliary pump that is rotation driven by an electric motor and supplies hydraulic oil to the oil passage to assist the main pump; a regulator valve that regulates a line pressure of the oil passage to a predetermined value; a regulator valve control section that sends a command to regulate the line pressure to the regulator valve; a line pressure obtaining section that obtains the line pressure of the oil passage; and an auxiliary pump start section that controls starting of the auxiliary pump. | 09-23-2010 |
20100250077 | ADAPTIVE SHIFT LEARN CONTROL FOR AUTOMATIC TRANSMISSIONS - A control system includes first and second clutches of a transmission and a control module. Each of the first and second clutches includes an on state and an off state. The control module cycles the first clutch between the on state and the off state using a stepped command signal while the second clutch is maintained in the on state. The control module monitors an output parameter of the transmission that is based on the stepped command signal. The control module controls the transmission based on the output parameter. | 09-30-2010 |
20100262345 | CONTROL APPARATUS FOR MULTI-SPEED AUTOMATIC TRANSMISSION - A control apparatus for a multi-speed automatic transmission which is equipped with a manual shift mode that allows a speed step to be shifted up or down manually by an operation of a driver of the vehicle is provided. The control apparatus permits a downshift to be manually performed, provided that during the manual mode, one of vehicle speed, engine rotation speed, and turbine rotation speed of the multi-speed automatic transmission is less than or equal to a downshift permission criterion value that is set according to the speed step achieved by the downshift. The control apparatus corrects the downshift permission criterion value by a speed-value-increasing correction amount that is computed according to the situation of travel of the vehicle. The control apparatus includes a speed-value-increasing correction amount computation portion that computes the speed-value-increasing correction amount separately for each of numbers of steps over which downshifts occur. | 10-14-2010 |
20100305823 | AUTOMATIC TRANSMISSION CONTROL APPARATUS, CONTROL METHOD, PROGRAM FOR REALIZING THAT METHOD, AND RECORDING MEDIUM ON WHICH THAT PROGRAM IS RECORDED - An ECU controls an automatic transmission that can be manually shifted. The ECU executes a program that includes i) the step of, when there are a plurality of allowed gears that are allowed at the time of a downshift operation (i.e., YES in S | 12-02-2010 |
20100318270 | CONTROL APPARATUS OF DRIVING FORCE IN CASE OF BELT SLIPPING FOR VEHICLE EQUIPPED WITH V-BELT CONTINUOUSLY VARIABLE TRANSMISSION AND CONTROL METHOD THEREOF - A control apparatus of a driving force in case of belt slipping includes a belt slip control detecting unit adapted to detect that the belt slip control is in execution, a belt contact radius ratio calculating unit adapted to calculate a belt contact radius ratio of the V-belt to the pulleys, and a power source output torque determining unit adapted to determine a target power output torque according to the belt contact radius ratio in execution of the belt slip control in response to signals from the belt slip control detecting unit and the belt contact radius ratio calculating unit. | 12-16-2010 |
20100324791 | METHOD FOR CONTROLLING A HYDROSTATIC DRIVE - The invention relates to a method for controlling a hydrostatic drive having at least one first hydraulic consumer and one second hydraulic consumer. The two hydraulic consumers are driven by a common drive machine. First of all, a first power requirement of the first hydraulic consumer is determined ( | 12-23-2010 |
20100332090 | METHOD AND SYSTEM FOR AUTOMATED CONTROL OF TRANSMISSION RATIO CHANGE - The present invention relates to a method and system for automated control of transmission ratio change which balances the requirements for power with energy efficiency. A plurality of sensors detect environmental conditions of a vehicle. An environmental conditions analysis unit analyzes the environmental conditions to determine whether the detected environmental conditions indicate a likelihood of a transmission ratio increase. When the detected environmental conditions indicate the likelihood of the transmission ratio increase, an automatic transmission changes in operation from a normal state to a prepared state. However, after a predetermined amount of time, the automatic transmission changes from the prepared state back to the normal state when there is no user indication that the transmission ratio should be increased. | 12-30-2010 |
20100332091 | HYDRAULIC CONTROL DEVICE AND HYDRAULIC CONTROL METHOD FOR VEHICLE AUTOMATIC TRANSMISSION - During a non-shift operation when a predetermined gear of an automatic transmission is kept, a hydraulic control unit increases an engagement hydraulic pressure to a friction engagement device associated with the gear formation by a predetermined hydraulic pressure with respect to a line hydraulic pressure. Therefore, in comparison with a case where a hydraulic pressure equivalent to the line hydraulic pressure is set as an engagement hydraulic pressure to the friction engagement device for obtaining a hydraulic pressure equivalent to the line hydraulic pressure, shift response (hydraulic pressure response) variations when shifting from a non-shift state (steady state) into a shift state are suppressed by the margin of the predetermined hydraulic pressure. In addition, in comparison with a case where the engagement hydraulic pressure to the friction engagement device is set to a maximum hydraulic pressure to reduce the response variations, power consumption of each linear solenoid valve is suppressed. | 12-30-2010 |
20100332092 | DEVICE AND METHOD FOR CONTROLLING AUTOMATIC GEARBOX - It is an object of the present invention to provide control device and control method for an automatic transmission which are capable of selecting a gear shift stage which accords with an intention of a vehicle driver irrespective of an accelerator opening angle. When an accelerator pedal opening angle is large, a target vehicle speed is calculated using a read-ahead vehicle speed and, when the accelerator pedal opening angle is small, the target gear shift ratio is calculated using an actual vehicle speed. | 12-30-2010 |
20110004382 | SYSTEM FOR ESTIMATING A VEHICLE MASS - A vehicle mass estimation system for use in a vehicle, such as a truck, including a transmission is provided. A processor may be operable to receive a signal relating to a mass of at least a portion of the vehicle. The processor may be further operable to estimate a vehicle mass based, at least in part, on the signal. The processor may be further operable to select a desired gear ratio for engagement in a transmission based, at least in part, on the estimated vehicle mass. | 01-06-2011 |
20110010062 | Method for Adapting a Drive Torque - A method adapts a drive torque that is transmitted to driven wheels of a motor vehicle, especially during cornering. A supplementary torque which arises during a gear change operation and is produced by a moment of inertia, in particular that of an engine, is transmitted to the driven wheels in dependence on a longitudinal/transverse acceleration of the motor vehicle and of a friction coefficient of the tires. | 01-13-2011 |
20110010063 | CONTROL DEVICE FOR VEHICULAR DRIVE APPARATUS - A control device for a vehicular drive apparatus, includes: a torque converter having a pump wheel, a turbine wheel and a stator wheel rotatably disposed between the turbine wheel and the pump wheel; an electric motor operative to drive and/or apply a brake to the stator wheel; a first connecting/disconnecting means operable to connect/disconnect the electric motor and the stator wheel to and from each other; a second connecting/disconnecting means operable to connect/disconnect the electric motor and an output shaft to and from each other; and mode switching means for switching a first mode in which the first connecting/disconnecting means is held in a connecting state to allow the electric motor to control a rotating state of the stator wheel and a second mode in which the second connecting/disconnecting means is held in a connecting state to enable the electric motor to perform power running and regeneration, depending on a running condition of a vehicle. | 01-13-2011 |
20110015840 | SHIFT CONTROL OF AUTOMATIC TRANSMISSION - A subtransmission mechanism | 01-20-2011 |
20110015841 | method for ascertaining a wheel reference speed of a wheel on a vehicle having a hydrostatic drive, and device for ascertaining a wheel reference speed of a wheel of a vehicle having a hydrostatic drive - A method for ascertaining a wheel reference speed of a wheel of a vehicle having a hydrostatic drive which uses a transfer medium, the hydrostatic drive acting at least on the one wheel, and the hydrostatic drive having an oscillating motor which may be swiveled to a pumping mode via which a torque may be applied to the wheel, and a wheel speed sensor for detecting the particular wheel speed being situated near the wheel, and the oscillating motor being appropriately adjusted while the wheel speed sensor ascertains the wheel reference speed in order to allow resistance-free flow of the transfer medium through the oscillating motor. The exemplary embodiments and/or exemplary methods of the present invention further relates to a device having arrangements for carrying out the method, and configured as a hydraulic drive control unit, for example. | 01-20-2011 |
20110029208 | SYSTEM AND METHOD FOR MONITORING THE STABILITY OF A HYBRID POWERTRAIN - A system and method for monitoring the stability of a hybrid powertrain system includes monitoring the system and its subsystems output response signals to its inputs to identify the system operating status. For example, for a hybrid powertrain system equipped with an electrically variable transmission (EVT), three signals are monitored. They are the two electrical motor speeds representing the direct subsystem response to their feedback control inputs and the EVT output speed representing the entire system's response. A stability monitoring system includes a mean determination module that determines a mean signal of the signals and an oscillation determination module that determines a signal oscillation signal based on the instant signal and the mean signal. The monitoring system also includes a signal mean crossing determination module that determines the signal crossing its mean signal and the oscillation peak detection, storage and comparison modules that determines system instability indicators for the control system to take corrective actions. | 02-03-2011 |
20110029209 | CONTROL DEVICE AND CONTROL METHOD FOR CONTINUOUSLY VARIABLE TRANSMISSION - An ECU executes a program including the steps of starting restriction of a target revolution number NINT of a primary pulley revolution number NIN to a limit value NGRD or lower and canceling restriction of the target revolution number NINT to the limit value NGRD or lower when a condition that the target revolution number NINT set by using a map is lower than the limit value NGRD is satisfied. | 02-03-2011 |
20110035124 | METHOD OF OPERATING AN AUTOMATIC TRANSMISSION AS WELL AS CONTROLLER - A method is provided for operating an automatic transmission for a vehicle, that includes, but is not limited to detecting whether a target speed of the vehicle is set, calculating an optimum acceleration gear in dependence of an actual virtual accelerator pedal position, and, if the optimum acceleration gear differs from a current gear, storing the actual virtual accelerator pedal position, shifting to the optimum acceleration gear and ignoring newly calculated actual virtual accelerator pedal positions for an acceleration period of time. Since the actual virtual accelerator pedal position is stored in the case of a detected necessary gear shift and further calculated actual virtual accelerator pedal positions are ignored for a time, the operating of the transmission is based mainly on the value of the actual virtual accelerator pedal position at the time, when a necessary gear shift is detected. The risk that due to insignificant changes of the accelerator pedal position the gear is shifted up and down several times (“gear hunting”) until the target speed is reached is reduced. | 02-10-2011 |
20110035125 | CONTROL APPARATUS FOR AUTOMATIC TRANSMISSION - A control apparatus for an automatic transmission includes a torque calculator configured to calculate a torque required during a speed change for a hydraulic clutch at a target speed stage based on an output torque of an engine. A supply fluid pressure calculator is configured to obtain, from the calculated torque, a supply fluid pressure to be supplied to the hydraulic clutch by using a clutch friction coefficient. A fluid supplier is configured to supply the obtained supply fluid pressure to the hydraulic clutch to perform the speed change for an output of the engine through a gear corresponding to the target speed stage. A clutch plate temperature estimating device is configured to estimate a plate temperature of the hydraulic clutch. A fluid pressure correcting device is configured to correct the supply fluid pressure based on the estimated plate temperature. | 02-10-2011 |
20110046860 | LINEAR ACTUATOR WITH POSITION SENSING SYSTEM - An electromagnetic actuator assembly with a frame, a movable element, first and second sensor targets that are coupled to the movable element for movement therewith, first and second sensors that are coupled to the frame and a controller. The first sensor is configured to sense a position of the first sensor target and to produce a first sensor signal in response thereto. The second sensor is configured to sense a position of the second sensor target and to produce a second sensor signal in response thereto. The controller that receives the first and second sensor signals and identifies three or more discrete points along a path of travel of the plunger. A differential assembly that incorporates the electromagnetic actuator assembly is also provided. | 02-24-2011 |
20110054748 | ENGINE DRIVEN VEHICLE WITH TRANSMISSION - An engine driven vehicle includes at least one engine, and control devices that are arranged to control a transmission that is driven by the engine. The control devices are arranged to receive at least two sets of data, each set comprising at least one of a first signal that comprises information about the gradient of the surface on which the vehicle is being driven sent from a first sensor, and at least one second signal that comprises information about the vehicle's speed sent from a second sensor, and at least one third signal that comprises information about the vehicle's acceleration. The invention is characterized in that the control devices are also arranged to calculate at least one of two different resistance to travel constants k | 03-03-2011 |
20110054749 | System for Controlling Torque Converter Temperature During Torque Converter Stall Conditions - A method and system are provided for controlling the operating temperature of a torque converter during torque converter stall conditions. The torque converter has a pump rotatably driven by an internal combustion engine and a rotatable turbine fluidly coupled to the pump. The system first determines whether the torque converter is currently in a torque converter stall condition, and, if so, determines a slip speed as a difference in rotational speeds between the pump and the turbine, determines an engine output torque limit as a function of the slip speed and a desired slip speed, and controls the operating temperature of the torque converter by limiting output torque produced by the engine based on the engine output torque limit. | 03-03-2011 |
20110054750 | METHOD AND DEVICE FOR CONTROLLING SLIP IN A TRACTOR VEHICLE OR THE LIKE - A method and a device for controlling the slip of a tractor vehicle or the like, in which the drive wheel slip is determined and, if the actual slip is different from a specified nominal slip, the gear ratio of a controllable transmission in the drivetrain is adjusted in the direction of slip optimization. The transmission is a geared-neutral transmission whose output speed, at full drive power, can be adjusted to an extremely small value close to zero. | 03-03-2011 |
20110060509 | DESIRED TORQUE CONVERTER CLUTCH SLIP FEEDBACK RECOVERY ALGORITHM FOR TIP-IN MANEUVERS - A powertrain includes an engine, a transmission, and a torque converter located between the engine and the transmission. Subsequent to a rapid increase in engine torque commands, torque converter slip is controlled by monitoring a measured torque converter slip after the rapid increase in engine torque commands, determining a maximum measured torque converter slip value resulting from the rapid increase in engine torque commands based upon the measured torque converter slip, determining a target value to which to reduce the torque converter slip, determining a recovery profile to reduce the torque converter slip from the maximum measured torque converter slip to the target value, and utilizing the recovery profile to controllably reduce the torque controller slip. Determining the recovery profile includes commanding reducing slip through the profile at commanded torque converter slip values selected to prevent the torque converter slip from reaching zero. | 03-10-2011 |
20110066339 | AUTOMATIC TRANSMISSION - An automatic transmission including an input shaft connected to a drive source; an output shaft connected to a driving wheel; a one-way clutch; friction engagement elements which establish speeds by changing a transmission path between the input shaft and the output shaft based on the application state of the friction engagement elements and application of the one-way clutch, one of the friction engagement elements being a brake that is applied when coasting in a take-off speed. The automatic transmission also includes a controller that determines whether it is possible to initially establish the take-off speed using the one-way clutch based on a predetermined condition, and, if not possible, then the controller establishes the take-off speed by applying the brake. | 03-17-2011 |
20110071741 | METHOD AND APPARATUS FOR ENTERING NEUTRAL IDLE FROM A FORWARD DRIVE MODE - A transmission includes a plurality of clutches that are selectively engageable alone or in combination with each other to establish a plurality of forward drive modes, wherein one of the clutches is configured as a neutral idle (NI) clutch that is selectively actuated to shift the transmission into an NI state, and a controller. The controller is adapted to shift the transmission from a forward drive mode into the NI state during a coast-down maneuver prior to the transmission reaching a zero output speed. A method of shifting the transmission into the NI state includes determining the presence of a predetermined one of the forward drive modes using the controller, and using the controller to actuate a designated one of the clutches as an NI clutch to enter the NI state during the forward drive mode, during a coast-down maneuver, and prior to the transmission reaching a zero output speed. | 03-24-2011 |
20110082630 | OIL PUMP CONTROL APPARATUS OF VEHICLE - In an oil pump control apparatus of a vehicle includes a first driving power source for propelling the vehicle, a first oil pump driven by the first driving power source, a second oil pump driven by a second driving power source, and a hydraulically-operated portion supplied with working oil from the first and second pumps, a look-ahead vehicle speed estimation section is provided for estimating, based on a vehicle running condition, a look-ahead vehicle speed, which may occur a given elapsed time later. Also provided is a second-oil-pump control section configured to predict, based on the look-ahead vehicle speed, whether a lack in discharge pressure produced by the first pump from a required hydraulic pressure, and further configured to start up the second pump, when it is predicted that a lack in discharge pressure of the first pump from the required hydraulic pressure occurs. | 04-07-2011 |
20110087409 | TORQUE VECTORING DEVICE AND MEANS FOR ITS CONTROL - A torque vectoring device directs different torques at will to the two wheels of a drive axle on a road vehicle. It has two hydraulically controlled disc clutches, connected to a drive shaft, extending through the device, and in engaged condition intended for connecting the drive shaft to either of two gear sleeves, each in splines engagement with an eccentric tube eccentrically journaled in relation to the drive shaft, and a torque transmitting mechanism with a gear ratio of 1:1 between the eccentric tube and a differential case sleeve, coaxial with the drive shaft and forming part of a differential case of a differential on the drive axle, to which differential the torque vectoring device is connected. | 04-14-2011 |
20110112735 | LINE PRESSURE CONTROL DEVICE FOR AUTOMATIC TRANSMISSION - Fuel economy of a vehicle is improved by enlarging a low line pressure region of mapped data (hydraulic pressure control characteristics) on the basis of temperature of hydraulic oil. The mapped data of line pressure set to any of high pressure/low pressure regions on the basis of an engine load are stored in a storage section | 05-12-2011 |
20110112736 | VEHICLE CONTROL DEVICE - A vehicle control device having a shift-by-wire system that switches a driving range of a vehicle transmission by inputting a range switching signal to a shift switching device, includes: an abnormality detecting means that detects an abnormality that the shift switching device cannot switch the driving range, of the shift-by-wire system; and a driving force suppressing means that suppresses a driving force of a vehicle when an abnormality is detected in the shift-by-wire system and when a vehicle stop is predicted, and the driving force suppressing means switching a gear stage of the vehicle transmission to a higher-speed gear stage. | 05-12-2011 |
20110130932 | Vehicle Control System - A vehicle control system includes a determiner configured to determine whether or not a driver has performed a predetermined acceleration or deceleration operation; a detector configured to detect a value of at least one of a relative rotational position and relative rotational speed of an input shaft and an output shaft, the input shaft being positioned upstream of an engagement portion of driving power transmission members which are engaged with each other with a slack on a driving power transmission path, and the output shaft being positioned downstream of the engagement portion, and a controller configured to execute control for accelerating or decelerating the input shaft or the output shaft to reduce at least one of a contact speed and transmission torque of the driving power transmission members based on the value detected by the detector, if the determiner determines that the driver has performed the acceleration or deceleration operation. | 06-02-2011 |
20110130933 | LOCK-UP CONTROL APPARATUS FOR AUTOMATIC TRANSMISSION - A lock-up control apparatus includes a kick-down instruction detector configured to detect a kick-down shift transmission instruction during application of a lock-up clutch. A first lock-up control amount changer is configured to change the lock-up control amount when the kick-down shift transmission instruction is detected. An intermediate gear speed determinator is configured to determine whether the kick-down shift transmission instruction includes an intermediate gear speed shift transmission instruction to an intermediate shift transmission gear speed. A second lock-up control amount changer is configured to change the lock-up control amount when the kick-down shift transmission instruction includes the intermediate gear speed shift transmission instruction. A target gear speed shift transmission instruction detector is configured to detect a target gear speed shift transmission instruction. The third lock-up control amount changer is configured to change the lock-up control amount when the target gear speed shift transmission instruction is detected. | 06-02-2011 |
20110137532 | METHOD OF CONTROLLING VEHICLE WASHING MODE FOR VEHICLE EQUIPPED WITH SHIFT-BY-WIRE SHIFTING DEVICE - A method of controlling a vehicle washing mode for a vehicle equipped with shift-by-wire shifting device, may include performing an N-range-off determining step that determines whether a shift lever is in an N-range when an engine stops, performing an ACC determining step that determines whether the vehicle is in an ACC state, and performing a shifting step that shifts a P-range state of a transmission to a N-range state thereof by operating an actuator, when the N-range-off determining step determines that the shift lever is in the N-range when the engine was stopped, and when the ACC determining step determines that the vehicle is in the ACC state. | 06-09-2011 |
20110144872 | VARIATOR LOCKOUT VALVE SYSTEM - A variator lockout valve system for a continuously variable transmission includes a pair of shift valves. Each shift valve has at least one port that is fluidly coupled to a variator of the continuously variable transmission. Electro-hydraulic actuators control the position of each of the shift valves. When the shift valves are in one position, pressure control valves supply fluid pressure to the variator. If one of the shift valves is in another position, one of the pressure control valves is blocked from supplying fluid pressure to the variator. | 06-16-2011 |
20110153173 | METHOD FOR CONTROLLING AN AUTOMATIC MULTI-STEP SHIFT TRANSMISSION - A method of controlling an automatic transmission arranged in a vehicle between a drive motor and an axle drive of a drive axle or a transfer box such that the current road inclination is determined and, after driving onto a downhill stretch of road, to increase a braking action of the drive motor and/or a permanent brake, a shift to a lower gear is carried out and after a transition to a traction operation or after driving onto level ground, a shift to a higher gear is carried out. To improve transmission shifting behavior, when transitioning between a downhill stretch and level ground, it is provided that a function for detecting a downhill run-out is started and if a downhill run-out is detected, and a shift to a higher gear is carried out while still in a thrust operation before driving onto the level ground and/or before the transition to traction operation. | 06-23-2011 |
20110153174 | ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION WITH TORQUE LIMITING SYSTEM AND METHOD THEREOF - Is provided herein a torque-limiting electronically controlled CVT comprising a drive portion having a drive pulley including two opposed sheaves adapted to be actuated with an electric motor to set a transmission ratio between an engine and a ground contacting rotating member of a vehicle, an input module adapted to receive a signal indicative of whether a ground-contacting rotating member is airborne, a processing module adapted to determine a desired CVT ratio, and an output module adapted to actuate the electric motor to obtain the desired CVT ratio to match the circumferential velocity of the vehicle's airborne ground-contacting rotating member with the speed of the vehicle in order to limit a mechanical peak torque sustained by a drive system of the vehicle. Also provided hereby is a vehicle equipped with the CVT, a kit including such a CVT and a method of managing the CVT to limit the mechanical peak torque sustained by a drive train of a vehicle. | 06-23-2011 |
20110166756 | Anti-rollback Control System for Hybrid and Conventional Powertrain Vehicles - The present invention provides an anti-rollback control system for use in a motor vehicle, having a powertrain which includes an ICE and/or an electric motor, and an automatic or automated transmission system, for preventing undesired rolling of said vehicle on an incline. | 07-07-2011 |
20110172892 | PTO Control System - A PTO control system for allowing selection between an independent PTO mode and an interlock PTO mode, comprising a mode-switch command input device | 07-14-2011 |
20110184615 | Anti-rollback Control System for Hybrid and Conventional Powertrain Vehicles - The present invention provides an anti-rollback control system for use in a motor vehicle, having a powertrain which includes an ICE and/or an electric motor, and an automatic or automated transmission system, for preventing undesired rolling of said vehicle on an incline. Said anti-rollback control system comprises: a tilt sensor; a sensor that detects the selected transmission's operating mode; operator-independent accelerator pedal position-adjusting device; and an accelerator pedal control module. The control module receives signals from the sensors, process said signals, and send instructions accordingly to said accelerator pedal position-adjusting device to move the accelerator pedal to a predetermined position according to which the vehicle's powertrain generates a preset amount of mechanical power sufficient to create a force, in the intended direction of movement of the vehicle, equivalent to, or bigger than, the gravitational force tending to roll the vehicle in the unwanted direction. | 07-28-2011 |
20110190991 | AUTOMATIC TRANSMISSION CONTROL DEVICE, TRANSMISSION DEVICE, AND POWER OUTPUT DEVICE - An automatic transmission control device for improving shift feel includes a pressure regulating device that regulates a friction engagement element, and transmits power to an output shaft, which is input to an input shaft through a change of a shift speed by controlling the pressure regulating device to switch an engagement state. When changing shift speed while applying torque to the input shaft, the transmission changes the shift speed via (1) a torque phase where torque is changed according to shift speed after shifting, and (2) an inertia phase where an input shaft rotation speed is changed according to the shift speed after shifting. During a shift speed change, the regulating device executes the torque phase by engaging the engagement element at a predetermined pressure with slip and standby, and executes the inertia phase by reducing an amount according to the shift speed so a shifting condition falls within a predetermined range regardless of changed shift speed, and reduces input shaft torque by a set amount, while standing by at the predetermined engagement pressure | 08-04-2011 |
20110190992 | METHOD FOR THE CONTROL OF AN AUTOMATIC TRANSMISSION OF A MOTOR VEHICLE, CONTROL DEVICE FOR AN AUTOMATIC TRANSMISSION OF A MOTOR VEHICLE AND MOTOR VEHICLE - A method is provided for the control of an automatic transmission of a motor vehicle at least during downhill driving of the motor vehicle in coasting mode. The method includes, but is not limited to setting of a desired speed v | 08-04-2011 |
20110196586 | VEHICLE CONTROL DEVICE - When a capacity coefficient (Cre) of a torque converter is larger than or equal to a predetermined threshold (CreA), a speed ratio (e) is calculated on the basis of an actual power transmission efficiency (η) by referring to a predetermined unique relationship between a power transmission efficiency (η) and a speed ratio (e). Therefore, even in a second speed ratio variation range (R | 08-11-2011 |
20110231072 | METHOD FOR CONTROLLING A DRIVETRAIN OF A MOTOR VEHICLE HAVING AN AUTOMATIC CLUTCH - A method for triggering a signal for the separation of the drivetrain input section and drivetrain output section of a motor vehicle having an automatic clutch, characterized in that as a function of the change in clutch torque, and with a time (t | 09-22-2011 |
20110231073 | CONTROL APPARATUS OF AUTOMATIC TRANSMISSION - A control apparatus for a vehicle includes an automatic transmission configured to attain a predetermined shift-stage by releasing an engaged friction-engagement element and by engaging a released friction-engagement element; a variation-start detecting section configured to detect that a parameter which varies with a progress of inertia phase has varied; a memorizing section configured to sequentially memorize a state of the vehicle; and a learning section to configured to correct a control quantity for a next-time shift of the transmission on the basis of the state of vehicle memorized at a timing earlier by a given time interval than a timing when the variation-start detecting section detects that the parameter has varied. | 09-22-2011 |
20110238273 | Method of Aligning a Transmission Synchronizer - The present disclosure relates to methods of detecting misalignment in a transmission synchronizer and methods of alignment. Detection of misalignment is accomplished via monitoring a performance characteristic of a power source configured to provide an engagement force to the synchronizer. Where misalignment is detected a predetermined torque is applied to the input or output side of the synchronizer to rotationally align synchronizer components. | 09-29-2011 |
20110238274 | SHIFT CONTROL APPARATUS AND TRANSMISSION APPARATUS - A shift control apparatus controlling a stepped transmission. The apparatus is configured with a gear ratio setting unit, and a shift speed change determining unit. A shift speed change predicting unit predicts in advance a change of shift speed by the shift speed change determining unit based on the set gear ratio, a rate of change in the set gear ratio, and an engagement preparation time which is a time needed for engagement preparation of the friction engagement element. A shift control unit controls a hydraulic actuator so that engagement preparation of a friction engagement element to be engaged is performed when a change of shift speed is predicted, and controls the hydraulic actuator so that a hydraulic pressure needed for engaging the friction engagement element is supplied to a hydraulic servo when a change of shift speed is determined by the shift speed change determining unit. | 09-29-2011 |
20110246034 | POWER TRANSFER DEVICE AND CONTROL METHOD THEREOF, AND LOCK-UP CLUTCH DEVICE - A device with a stepped automatic transmission to transfer power from a power source to an axle using changeable shift speeds includes an input-side fluid transmission element connected to the power source, an output-side fluid transmission element connected to the transmission input shaft, a lock-up clutch engaging and disengaging the input-side and the output-side fluid transmission elements; a unit adjusting the lock-up clutch; a unit setting, when a downshift is to be performed in response to a predetermined request for a large drive force, a predetermined target slip speed value larger than a non-shifting-time value before a rotational speed of the power source exceeds a input shaft rotational speed after the downshift, and setting the target slip speed to decrease toward the non-shifting-time value along with lapse of time after the power source rotational speed source exceeds the post-shifting input shaft speed; and a unit controlling the engagement force so the slip speed becomes the set target slip speed. The target slip speed is a difference between the rotational speeds of the power source and the input shaft, and the non-shifting-time value is set when no shifting is performed. | 10-06-2011 |
20110246035 | CONTROL METHOD OF THE POSITION OF A SOLENOID VALVE USING DITHERING - Control method of the position of a solenoid valve using dithering; the control method provides the steps of: determining a target current across the solenoid valve which is expressed in digital form with a given minimum quantization interval; adding a dithering square wave to the target current; controlling the voltage applied to the solenoid valve to cause the current across the solenoid valve to track the target current added to the dithering square wave; jiggling the dithering square wave with a frequency which is a sub-multiple with respect to the maximum variation frequency of the current across the solenoid valve; and varying the amplitude of the dithering square wave for a fraction of the period of the dithering square wave itself and by an amount equal to the minimum quantization interval for temporarily determining a deviation of the mean value of the dithering square wave with respect to zero and therefore obtaining a corresponding variation of the mean value of the target current. | 10-06-2011 |
20110251765 | METHOD FOR THE CONTROL OF A SHIFTING OPERATION OF AN AUTOMATIC TRANSMISSION - A method is provided for the control of a shifting operation of an automatic transmission by means of an electronic transmission control unit. The transmission control unit receives of a maximum engine rotational speed EGSmax from an engine control unit, compares the current engine rotational speed EGScurrent with the maximum engine rotational speed EGSmax, and initiates upshifting if EGScurrent≧EGSmax-x, where x is a calibratable offset. | 10-13-2011 |
20110257855 | CONTROL SYSTEM AND METHOD FOR SHIFT FORK POSITION IN DUAL CLUTCH TRANSMISSIONS - A control system includes a pressure control solenoid and a flow control solenoid having an input in fluid communication with the pressure control solenoid. A piston adjusts a position of a shift fork and includes a first area in fluid communication with the pressure control solenoid and a second area in fluid communication with the flow control solenoid. A fork sensor senses a position of a shift fork. A flow determining module determines a fork velocity for the shift fork, adjusts the fork velocity to generate an adjusted fork velocity based on the position, and generates a flow command for the flow control solenoid based on the adjusted fork velocity. A pressure determining module generates a pressure command for the pressure control solenoid. The shift fork is at least one of moved from a sync position to an engaged position and from an engaged position to a neutral position. | 10-20-2011 |
20110288734 | POWERTRAIN CONTROL SYSTEM AND METHODS WITH ECM-TO-TCM PARAMETER TRANSFER PROTOCOLS FOR TCM BASED CONTROL - A control system includes an engine control module and a transmission control module. The transmission control module communicates with the engine control module via a network. The engine control module generates a mean engine speed signal and a minimum engine speed signal. The engine control module transmits the mean engine speed signal and the minimum engine speed signal to the transmission control module via the network. The transmission control module controls operation of at least one of a torque converter and a transmission based on the mean engine speed signal and the minimum engine speed signal. The torque converter is connected between an engine and the transmission. | 11-24-2011 |
20110295472 | CONTROL SYSTEM AND METHOD FOR ADAPTIVE CONTROL OF TRANSMISSION FLUID OPERATING PRESSURES - A control system for a transmission includes a pressure control module and a pressure adapt module. The pressure control module operates a hydraulic control system of the transmission at a target pressure during steady-state operation of the transmission. The target pressure is based on first and second learned pressures for different predetermined first and second torque ranges. The pressure adapt module selectively adjusts at least one of the first learned pressure and the second learned pressure based on a first pressure at which a slip condition of the transmission occurs. The first and second learned pressures define a learned pressure gain and offset. When adjusting the first and second learned pressures, the pressure adapt module limits increases and decreases in the learned pressure gain offset based on a predetermined pressure gain and offset. A method is also provided. | 12-01-2011 |
20110295473 | Variator pressure-set torque control - A method and system for configuring a hydromechanical transmission having a hydraulic pump and a hydraulic motor driven by the hydraulic pump and a pressure-driven actuator employs a particular torque-pressure curve configuration to maximize torque resolution with respect to actuator pressure changes while ensuring that the curve is substantially monotonic in each dimension and at any available motor speed within a predetermined motor speed limit and any available actuator pressure within predetermined actuator pressure limits. The resultant four-dimensional association between actuator pressure, motor speed, primary power source speed and motor torque allows selection of an actuator pressure to provide a desired torque. | 12-01-2011 |
20110295474 | TRANSMISSION LOAD PREDICTING SYSTEM FOR A STOP-START SYSTEM AND A HYBRID ELECTRIC VEHICLE - An engine system of a vehicle includes an engine torque module. The engine torque module determines an engine output torque profile including predicted torque outputs based on an accelerator signal and an engine state variable. A load control module determines a dynamic transmission load profile based on the engine output torque profile and an engine speed profile. The dynamic transmission load profile includes transmission loads as a function of engine speed during an auto-start of an engine. A compensation module generates a torque compensation signal based on the dynamic transmission load profile. An actuator module compensates for a change in a transmission load based on the torque compensation signal and during a transition of the engine from a cranking state to an idle state. | 12-01-2011 |
20110320096 | CONTROL APPARATUS FOR AN AUTOMATIC TRANSMISSION - The present invention provides a control apparatus for an automatic transmission which is capable of preventing friction engagement elements from being kept in an engagement state in accordance with the traveling state of a vehicle when a shift lever is operated to the position where an neutral range is formed, even if the malfunction of one or more solenoid valves occurs. | 12-29-2011 |
20120010793 | SHIFT CONTROL DEVICE FOR VEHICLE - A shift control device for vehicle is provided in which a first operating state (running state of a P-ECU | 01-12-2012 |
20120010794 | CONTROL APPARATUS FOR AUTOMATIC TRANSMISSION AND CONTROL METHOD THEREOF - In an operation of controlling an automatic transmission, an engagement pressure for each hydraulic servo in a normal operation is determined so that none of friction engagement elements slips at each shift speed in the normal operation, and so that in case of a failure in which the friction engagement element that is supposed to be disengaged in the normal operation is engaged, one of the friction engagement elements slips, and thus one of the shift speeds is established. In the control operation, upon detection of a failure state in which a gear ratio after a shift operation is a gear ratio of a shift speed different from a shift speed to be established, the slipping friction engagement element is disengaged, and the shift speed that is different from the shift speed to be established is temporarily retained. | 01-12-2012 |
20120022754 | SHIFTING CONTROL DEVICE FOR VEHICLE - It is provided a shifting control device for vehicle for electrically controlling a switching of a transmission to a parking range for performing a parking lock in response to an operation by a driver, the shifting control device for vehicle configured to determine the switching to the parking range when the driver performs a predetermined operation for switching to the parking range, based on whether plural vehicle speed signals different in response relative to an actual vehicle speed satisfy a predetermined condition; and the switching to the parking range being determined (i) using a corrected value obtained by correcting a vehicle speed signal having a slower response such that a difference in a vehicle speed based on the vehicle speed signal having the slower response and a vehicle speed signal having a quicker response is suppressed, or (ii) using a corrected value obtained by correcting a predetermined vehicle-speed threshold value associated with the vehicle speed signal having the quicker response such that the slower the response of the vehicle signal having a slower response is, the larger is the corrected value than the corrected value associated with the vehicle speed signal having the quicker response. | 01-26-2012 |
20120022755 | VEHICLE, CONTROL METHOD AND CONTROL APPARATUS FOR VEHICLE - Damping control, by which an engine is controlled to output torque for reducing up-and-down vibrations such as pitching and bouncing of a vehicle, is performed. When the damping control is interrupted, the behavior of engine torque after the damping control is interrupted is predicted. Shift of an automatic transmission is controlled in accordance with the predicted behavior of the engine torque. | 01-26-2012 |
20120022756 | SHIFT CONTROL DEVICE FOR VEHICLE - A shift control device is provided for a vehicle of shift-by-wire type having shift operation detecting means electrically detecting a shift operation of a driver, range switching means switching a shift range in response to the shift operation of the driver, failure detecting means detecting a failure in a shift operation detection executed by the shift operation detecting means, and vehicle state detecting means detecting a vehicle state upon detection of the failure in the shift operation detection, the range switching means being switched to a fail-safe mode, when the shift operation detection is recovered from a failed state to a normal state and the range switching means is switched from the fail-safe mode to a normal control mode, a recovery condition for determining switching of the fail-safe mode to the normal control mode being altered depending on the vehicle state. | 01-26-2012 |
20120041656 | OPERATION METHOD OF A TRANSMISSION DEVICE - A method of operating a transmission device comprising at least one input shaft and at least two output shafts. Torque that is present at the input shaft can be distributed between the two output shafts with a variable degree of distribution which can be changed according to the operating state depending on a transmission capability of at least one shift element. When a request to set a predefined degree of distribution is received, a mechanical self-locking torque of the transmission device—which influences the degree of distribution between the output shafts and is dependent upon the torque present at the input shaft—is determined, and a difference between the mechanical self-locking torque and a target overall locking torque of the transmission device that is equivalent to the required degree of distribution is determined. The transmission capability of the at least one shift element is set depending on this difference. | 02-16-2012 |
20120065853 | SYSTEM AND METHOD TO PREVENT SHIFT HUNTING - A method for preventing shift hunting in a powertrain is disclosed. The powertrain includes an engine and a transmission having a variator, a first gearset, and a second gearset. The engine is operated at a first substantially constant speed. A first transmission shift condition is detected. A desired transmission output torque is determined. The transmission is operated at a transmission torque different than the desired torque as a function of the first shift condition. | 03-15-2012 |
20120072086 | Apparatus and Method For Increasing Transmission Line Fluid Pressure - A transmission system that includes a transmission, a pressure sensor, a pressure booster, and a controller. The pressure booster being capable of raising the pressure of transmission fluid inside a closed-loop transmission by lowering the sensed pressure coming from the pressures sensor and being sent to the controller, thereby initiating a response from the controller that results in higher fluid pressures. The pressure booster does not lower the sensed pressure when the vehicle, and therefore, the transmission, is not in operation. Additionally, the pressure booster also does not increase the electric current through the electrical components of the fluid control system. The result is a transmission with a “firmer” feel between shifts and the correction of weak shifting problems such as gear slip. | 03-22-2012 |
20120089309 | VEHICLE CONTROL DEVICE - A vehicle control device includes an accelerator pedal adjusted in degree of operation, thereby adjusting power generated by an engine as a power source when running a vehicle. In the vehicle control device, in order to enhance fuel economy more reliably, fuel cut is carried out when the degree of operation of the accelerator pedal is other than zero, that is, when an accelerator is not fully opened and the vehicle is decelerating, the fuel cut that is the control in which supply of fuel used for operating the engine is stopped. Thus, even if the accelerator is not fully closed, a quantity of fuel injected by a fuel injector, and hence fuel consumption can be reduced. Accordingly, fuel economy can be enhances more reliably. | 04-12-2012 |
20120101700 | SYSTEM AND METHOD FOR CONTROLLING A TRANSMISSION TO IMPROVE EXHAUST BRAKING - A system for controlling a transmission of a vehicle powered by an engine includes a torque determination module and a shift determination module. The torque determination module determines a desired exhaust brake torque for the engine based on an actual speed of the vehicle and a desired speed of the vehicle. The shift determination module determines whether to shift between gear ratios of the transmission based on the desired exhaust brake torque and an exhaust brake torque capacity of the engine. | 04-26-2012 |
20120130610 | Non-Synchronous Automatic Transmission Up-Shift Control Utilzing Input Torque Signal - A non-synchronous automatic transmission up-shift control utilizes input torque measurements. The input torque is measured during an up-shift having preparatory, torque, and inertia phases. Target input torque profiles for the torque and inertia phases are determined based on the input torque during the preparatory phase. During the torque phase, an engine torque is controlled to cause the input torque to achieve the target profile for the torque phase. During the inertia phase, the on-coming clutch is controlled to cause the input torque to achieve the target profile for the inertia phase. | 05-24-2012 |
20120226422 | Shift control and method - A machine has a power train including a prime mover connected to a transmission having two or more selectable gear settings. The machine includes an electronic controller configured to receive and transmit signals indicative of machine parameters. The electronic controller contains computer executable instructions for determining a current value for at least one efficiency metric of the machine at a current gear setting of the transmission. Instructions for determining a first expected value for the efficiency metric at a first alternative gear setting, instructions for comparing the current value with the first expected value to determine an optimal gear setting as between the current gear setting and the first alternative gear setting at least partially based on engine speed, and instructions for indicating a gear shift recommendation and/or performing a gear shift to select the optimal gear setting are executed during operation. | 09-06-2012 |
20120253619 | METHOD AND SYSTEM FOR DRIVING OF A VEHICLE - A method for driving a vehicle which has a gearbox connected to a combustion engine and the gearbox is capable of being set to a number of different transmission ratios in order to deliver motive force to a driveshaft for propulsion of the vehicle. The vehicle is arranged for driving in at least a first mode and a second mode, such that in the first mode the gearbox is switched to a low transmission ratio and in the second mode the combustion engine is disconnected from the at least one driveshaft. When the vehicle is being driven in a situation where there is or will within a specific time be a reduced need for motive force for the vehicle, the method determines whether the vehicle should be driven according to the first mode or the second mode, on the basis of an ambient parameter. | 10-04-2012 |
20120259521 | CONTROL SYSTEM FOR BELT-TYPE CONTINUOUSLY VARIABLE TRANSMISSION - Surplus pressure is obtained from a difference between a hydraulic pressure value detected by a hydraulic pressure sensor and a target supplied hydraulic pressure. A determination is made about whether or not a possible hydraulic pressure in a prescribed time will become lower than a minimum required hydraulic pressure based on a current surplus pressure and a changing rate of the surplus pressure. If the possible hydraulic pressure is lower than the minimum required hydraulic pressure, correction is conducted to increase supplied hydraulic pressure. Accordingly, control is conducted so that the regularly required surplus pressure can be reduced to a minimum required amount. | 10-11-2012 |
20120277963 | FORECAST OF DRIVELINE LASH CONDITION FOR MULTIVARIABLE ACTIVE DRIVELINE DAMPING CONTROL - A method to predict a driveline lash condition includes monitoring an axle torque request signal, determining a predicted axle torque request value at a lead time based upon the monitored axle torque request signal, and predicting the driveline lash condition at the lead time based upon the predicted axle torque request value indicating an upcoming zero torque condition. | 11-01-2012 |
20130013162 | VEHICLE, CONTROL APPARATUS AND CONTROL METHOD FOR EQUIPMENT - The first setting value showing holding pressure for a metal belt is set for each of a plurality of control modes A to H. The second setting value changing lagging behind the first setting value is calculated based on the first setting value for each of the plurality of control modes A to H. A target value is set to be equal to or more than the greatest second setting value among a plurality of second setting values. A continuously variable transmission is controlled such that the holding pressure for the metal belt is equal to the set target value. | 01-10-2013 |
20130073157 | ENHANCED TORQUE MODEL FOR VEHICLE HAVING A CVT - A vehicle (e.g., an ATV/UTV) comprising a body, at least two wheels supporting the body, a power source providing torque to at least one of the wheels, a torque control system for controlling the torque provided to the wheels. The torque control system has a plurality of slip modes, including a low-slip mode and a high-slip mode. A mode selector is provided for selecting one of the plurality of slip modes, and the torque control system defaults to the low-slip mode on vehicle start up. Preferably, the torque control system further includes a medium-slip mode. In another aspect, the vehicle has a continuously-variable transmission including a drive member and a driven member, and a torque control system for controlling the torque provided to the wheels. The torque control system is programmed to calculate an estimated primary torque factor and an estimated secondary torque factor for modifying as base engine torque. | 03-21-2013 |
20130080003 | VEHICLE CONTROL APPARATUS - In a vehicle control apparatus, an engine torque calculating unit calculates a developing engine torque Te, and a torque increase/decrease amount calculating unit calculates a torque increase or decrease amount Tmax of an engine which can be increased or decreased. A mode coefficient setting unit sets a mode coefficient k corresponding to a driving mode, and an allowable inertia calculating unit multiplies the torque increase or decrease amount Tmax by the mode coefficient k to calculate an allowable inertia torque Timax. A shift speed calculating unit calculates a shift speed V | 03-28-2013 |
20130080004 | VEHICULAR SHIFT CONTROL APPARATUS - A vehicular shift control apparatus configured to control a speed ratio of a belt-type transmission having first and second variable-diameter pulleys, and a transmission belt wound between the first and second variable-diameter pulleys, by controlling hydraulic pressures to be applied to respective hydraulic cylinders of said first and second variable-diameter pulleys, according to respective commanded hydraulic pressure values of the first and second variable-diameter pulleys, such that the speed ratio coincides with a target value, the vehicular shift control apparatus includes a shift control portion configured to be operable, when a first-variable-diameter-pulley hold pressure which permits the speed ratio of said belt-type transmission to be held at the target value in a shift-down action is determined as said commanded hydraulic pressure value of the first variable-diameter pulley, to temporarily reduce said commanded hydraulic pressure value with respect to said first-variable-diameter-pulley hold pressure in an initial period of said shift-down action. | 03-28-2013 |
20130080005 | PROPULSION SYSTEM WITH A CONTINUOUSLY VARIABLE TRANSMISSION - One disclosed embodiment relates to a propulsion system for a machine. The propulsion system may include a prime mover operatively connected through a continuously variable transmission to a propulsion device. The propulsion system may also include propulsion-system controls that control an operating parameter of the continuously variable transmission, which may include adjusting the operating parameter based on operator input. Controlling the operating parameter may also include determining an adjustment limit for the operating parameter based on one or more operating conditions and applying the adjustment limit to the operating parameter to modify at least one of acceleration and jerk of the machine based on the one or more operating conditions. | 03-28-2013 |
20130096790 | PRIMARY CLUTCH ELECTRONIC CVT - A continuously variable transmission (CVT) is provided for use on a recreational or utility vehicle. The CVT is electronically controlled by at least one control unit of the vehicle. The CVT includes a primary clutch having a first sheave and a second sheave moveable relative to the first sheave. An actuator controls movement of the second sheave. | 04-18-2013 |
20130116900 | ABNORMAL STATE DIAGNOSIS METHOD FOR OIL TEMPERATURE SENSOR OF AUTOMATIC TRANSMISSION - An abnormal state diagnosis method for an automatic transmission oil temperature sensor includes: a warm-up judging step of judging whether a sensor value from an engine side temperature sensor in an engine warm-up state indicates the engine warm-up state; a sensor normal operation judgment step of starting to judge whether the engine side temperature sensor including the warm-up judgment result normally performs a temperature detection operation; a provisional judgment step of judging whether an upper or lower deviation width between the sensor value of the engine side temperature sensor and an oil temperature sensor value from an automatic transmission oil temperature sensor is equal to or smaller than a predetermined threshold value; and a final judgment step of determining the judgment result by the provisional judgment step when the automatic transmission control unit receives a permission signal from the engine control module. | 05-09-2013 |
20130131941 | CONTROL DEVICE OF VEHICLE POWER TRANSMISSION DEVICE - It is provided a control device of a vehicle power transmission device including: a torque limiter device blocking transmission of a torque amount exceeding a predetermined torque with operation involving differential rotation between a first rotating member and a second rotating member; and an electric motor coupled to one of the first rotating member and the second rotating member in a power transmittable manner, wherein when a rotation speed difference is generated between the first rotating member and the second rotating member due to the operation of the torque limiter device, the electric motor is operated so as to suppress the rotation speed difference. | 05-23-2013 |
20130138309 | SHIFT CONTROL APPARATUS OF CONTINUOUSLY VARIABLE TRANSMISSION - In a shift control apparatus of a continuously variable transmission (CVT) configured to steplessly vary a torque, the control apparatus employs an acceleration intention determination section for determining the presence or absence of a driver's acceleration intention, a shift mode setting section for setting a shift-control mode from a normal mode to an acceleration mode in the presence of the driver's acceleration intention, a shift speed setting section for setting a shift speed based on a target transmission ratio and a vehicle speed, and a shift control section for controlling a shift of the CVT. Also provided is a shift speed correction section for correcting the shift speed for an initial downshift in the acceleration mode to a shift speed slower than the shift speed set by the shift speed setting section, only when a demanded degree of the driver's acceleration intention is small. | 05-30-2013 |
20130158823 | CONTINUOUSLY VARIABLE TRANSMISSION - A CVT transmission comprising a shaft journalled to a housing, a first sheave fixed to the shaft, a second sheave moveable parallel to an axis of rotation of the shaft, the second sheave locked in rotating relation with the first sheave by a first sheave member cooperatively engaged with a second sheave receiving member, the second sheave receiving member disposed at a helical angle (HA) with respect to the axis of rotation, a sprocket journalled to the housing, the sprocket threadably engaged with a movable member, a bearing disposed between the movable member and the second sheave, the movable member engaged with the housing whereby movement of the movable member is parallel with the axis of rotation, an electric actuator engaged with the sprocket, and the second sheave is axially movable upon a rotation of the sprocket. | 06-20-2013 |
20130184949 | CONTROL DEVICE FOR AUTOMATIC TRANSMISSION - For each engine operation state to which a variable cylinder engine can be switched, a fuel consumption amount to be consumed to generate a driving force required to maintain a current traveling state of a vehicle for each of a current gear and a new gear after a possible shift-up is calculated. An automatic shift control of shifting up to the new gear is performed in a condition that a calculated fuel consumption amount of the new gear after the possible shift-up is smaller than a calculated fuel consumption amount of the current gear. In this way, the fuel consumption amount can be optimally reduced and the shift control can be performed without degrading the traveling performance, even in the vehicle equipped with the variable cylinder engine. | 07-18-2013 |
20130184950 | Control System and Method for the Transmission of a Vehicle - A control system for the transmission of an agricultural vehicle or an industrial off-highway vehicle, wherein the system comprises a controller of the clutch, connected thereto to supply an operating signal, a plurality of sensors suitable for measuring a plurality of characteristic quantities of the transmission and connected to the controller to supply a plurality of signals proportional to the quantities, a torque processor suitable for calculating a reference torque and connected to the controller to supply thereto a signal proportional to the reference torque, and a thermal load managing device suitable for receiving at least some of the plurality of quantities and for receiving the reference torque in order to calculate at least one operative datum on which the thermal power exchanged in the clutch is dependent. The control system is suited to process the operative datum to operate the transmission so as to limit the temperature in the clutch. | 07-18-2013 |
20130253787 | SYSTEM AND METHOD FOR CONTROLLING THE PRESSURE OF HYDRAULIC FLUID SUPPLIED WITHIN A WORK VEHICLE TRANSMISSION - A method for controlling the pressure of hydraulic fluid supplied within a transmission of a work vehicle. The method may generally include receiving a signal associated with a load condition of the work vehicle, determining a desired pressure for the hydraulic fluid supplied within the transmission based on the load condition and controlling a valve such that hydraulic fluid is supplied within the transmission at the desired pressure, wherein the transmission includes an input shaft, a counter shaft and at least two driven shafts extending parallel to the input and counter shafts. | 09-26-2013 |
20130261910 | CONTROL DEVICE AND CONTROL METHOD FOR AUTOMATIC TRANSMISSION - A control device for an automatic transmission mounted on a vehicle to establish a plurality of shift speeds by engaging engagement elements that need to be engaged for each shift speed. The control device includes a target shift speed setting means, a during-travel neutral control means, and a prediction control means. The prediction control means takes action when a predicted prechange time becomes equal to or less than a predetermined time while the automatic transmission is in the neutral state, the predicted prechange time being a time predicted on the basis of variations in vehicle speed and being a time before implementation of a change of the target shift speed that involves changing the particular engagement element from a disengaged state to an engaged state in order to maintain the neutral state. | 10-03-2013 |
20130261911 | METHOD OF CONTROLLING A VEHICLE EQUIPPED WITH AN INTERNAL COMBUSTION ENGINE WITH A STOP AND START SYSTEM - A method of controlling a vehicle equipped with an internal-combustion engine with a “stop and start” system. The method provides, during vehicle running, for learning the “duty cycle” values associated with the odd gears and even gears, determining the “maximum duty cycle” value for the odd gears and “minimum duty cycle” value for the even gears, determining a duty-cycle band to which the “neutral gear” condition corresponds on the basis of the “minimum duty cycle” value for the even gears and “maximum duty cycle” value for the odd gears, and controlling the “stop and start” system on the basis of the duty-cycle band to which the “neutral gear” condition corresponds. | 10-03-2013 |
20130268168 | METHOD FOR THE OPERATION OF A TRANSMISSION DEVICE IN A VEHICLE DRIVE TRAIN WHEN A REQUEST IS MADE TO CHANGE GEARS - A method of operating a transmission of a vehicle drive-train when a gearshift from a current gear toward a target gear has been requested. The transmission having frictional shifting elements and at least one interlocking shifting element. If an actuating electrical current, equivalent to a closed operating condition of the frictional shifting element to be engaged, and an actuating electrical current, equivalent to an open operating condition of the interlocking shifting element to be disengaged, are determined while, at the same time, a closed operating condition of the interlocking shifting element to be disengaged is detected by a sensor, a fault is recognized. If the fault is recognized during a predefined test period, one or more selected shifting elements are disengaged and a force flow in the transmission is interrupted. Alternatively, by disengaging the frictional shifting element to be engaged, the current gear is engaged in the transmission. | 10-10-2013 |
20130268169 | METHOD FOR THE OPERATION OF A TRANSMISSION DEVICE IN A VEHICLE DRIVE TRAIN, COMPRISING AT LEAST ONE FORM-FITTING SHIFTING ELEMENT AND MULTIPLE FRICTIONALLY ENGAGED SHIFTING ELEMENTS - When a request is made to change gears, the form-fitting shifting element being disengaged, for the requested gear change, is disengaged at a predefined target disengagement moment following the target disengagement moment. When the gear is actually changed, an actual disengagement moment is determined based on when the form-fitting shifting element begins disengaging and a transmission operating state variable. If there is a deviation between the actual moment and the target moment of disengagement, then the target disengagement moment is modified by a time value, and the moment when the form-fitting shifting element begins to be actuated is shifted in time in relation to the target moment of disengagement and/or actuation of the shifting element to be connected is adjusted to a determined characteristic of the operating state of the form-fitting shifting element to be disconnected such that it is disengaged approximately at the target disengagement moment. | 10-10-2013 |
20130289840 | HYDRAULIC CONTROL SYSTEM FOR AUTOMATIC TRANSMISSION - A hydraulic control system for an automatic transmission can improve a response and a controllability of the automatic transmission without increasing actuation frequency of the automatic transmission. The hydraulic control system is applied to an automatic transmission adapted to vary a torque capacity of a transmission member by an actuator. The hydraulic control system includes: a discharging device that discharges compressible gas entrained in the hydraulic fluid in the actuator; an interrupting device that interrupts power transmission; an entrainment determining device that determines an entrainment of the compressible gas in the hydraulic fluid; a disconnecting device that disconnects the power transmission by the interrupting device in case an entrained compressible gas is determined; and a discharging device that removes the entrained compressible gas from the hydraulic fluid by rotating the actuator while interrupting the power transmission. | 10-31-2013 |
20130304337 | GEAR SHIFTING CONTROL DEVICE FOR HYBRID VEHICLE - The gear shifting control device comprises a speed change operation completion detecting portion, a rotation difference judging portion for judging whether or not the absolute difference between the engine rotation speed and the input rotation speed exceeds a predetermined value and a clutch torque—operating amount correcting portion which replaces the clutch torque corresponding to the clutch actuator operating amount corresponding to the target clutch torque with a presumed clutch torque. Thus the correction accuracy for the clutch actuator operating amount can be improved by learning a speed change state by extracting a suitable state for learning. | 11-14-2013 |
20130311056 | CONTINUOUSLY VARIABLE TRANSMISSION DEVICE - Construction is achieved that is capable of ensuring reliability of a learned value for a position of an adjustment member | 11-21-2013 |
20130317712 | CONTROL DEVICE FOR TRANSMISSION AND BRAKING TORQUE GENERATING DETERMINATION METHOD FOR TRANSMISSION - A control device for a transmission including m (m≧3) solenoid valves and configured to establish a plurality of shift speeds by engaging n1 (2≦n111-28-2013 | |
20130325274 | CONTROL DEVICE FOR TRANSMISSION AND BRAKING TORQUE GENERATION DETERMINATION METHOD FOR TRANSMISSION - A control device for a transmission including m (m≧3) solenoid valves and configured to establish a plurality of shift speeds by engaging n1 (2≦n112-05-2013 | |
20130332037 | METHOD AND APPARATUS FOR OPERATING A MULTI-MODE TRANSMISSION SYSTEM UNDER DYNAMIC CONDITIONS - A method for controlling a multi-mode transmission system employing torque machines under dynamic operating conditions includes calculating a phase shift between a control parameter of one of the torque machines and a response parameter of the multi-mode transmission system under dynamic operating conditions, comparing the calculated phase shift and an expected phase shift, and executing remedial action when the calculated phase shift exceeds a threshold associated with the expected phase shift. | 12-12-2013 |
20130338888 | VARIATOR CONTROL WITH TORQUE PROTECTION - A transmission includes an electro-hydraulic controller that includes redundancy in the hydraulic circuit that permits single fault failures to be compensated for by changing the flow path of hydraulic fluid to bypass the single fault failure. The redundancy results in the ability of the transmission to maintain full operation in all modes. | 12-19-2013 |
20130338889 | COLD OPERATION MODE CONTROL FOR AN IVT - A transmission includes an electro-hydraulic controller that includes redundancy in the hydraulic circuit that permits single fault failures to be compensated for by changing the flow path of hydraulic fluid to bypass the single fault failure. The redundancy results in the ability of the transmission to maintain full operation in all modes. | 12-19-2013 |
20130338890 | CONTROL DEVICE FOR AUTOMATIC TRANSMISSION - A first hydraulic pressure control unit forms an oil path to supply oil to a frictional engagement element when a select lever is located in a travel range or between the travel range and a non-travel range and forms an oil path to discharge the oil from the frictional engagement element when the select lever is located in the non-travel range. An abnormality determination unit cancels an abnormality determination when only a travel range signal is output from a range signal output unit after a signal of the range signal output unit is determined to be abnormal, and maintains the abnormality determination when only a non-travel range signal is output from the range signal output unit. A second hydraulic pressure control unit forms an oil path to supply the oil to the frictional engagement element during the abnormality determination or when only the travel range signal is output, and forms an oil path to discharge the oil from the frictional engagement element before the abnormality determination or when only the non-travel range signal is output. | 12-19-2013 |
20140005903 | CONTROL UNIT FOR SYNCHRONOUS ENGAGING DEVICE | 01-02-2014 |
20140046560 | CONTROLLER AND CONTROL METHOD FOR VEHICLE - In a vehicle control, an automatic transmission is shifted using a predetermined shift model, which determines control operation amounts for achieving shift target values, by setting the shift target values on the basis of a torque on an output shaft-side rotating member and a speed variation amount of an input shaft-side rotating member, setting the control operation amounts on the basis of a torque on the input shaft-side rotating member, a torque capacity of an engaged-side engagement device during shifting and a torque capacity of a released-side engagement device during shifting and setting torque shares of a transmission torque between the engaged-side engagement device and the released-side engagement device during shifting when the transmission torque is converted to the torque on the input shaft-side rotating member, and timing at which the torque shares are varied is changed on the basis of a shift pattern. | 02-13-2014 |
20140067213 | OPERATIONAL PARAMETER DETERMINATION SYSTEMS AND METHODS WITH GEAR SHIFTING COMPENSATION - An operational parameter determination system is disclosed. The operational parameter determination system may include an operational parameter predictor configured to calculate an a priori estimated operational parameter of the machine based on a previously estimated operational parameter. The operational parameter determination system may also include a gear shifting compensator configured to determine whether a gear shifting is in progress, and when the gear shifting is in progress, to output the a priori estimated operational parameter as a determined operational parameter. The operational parameter determination system may further include an operational parameter updater configured to, when the gear shifting is not in progress, receive a measured operational parameter of the machine, determine an a posteriori estimated operational parameter of the machine based on the a priori estimated operational parameter and the measured operational parameter, and output the a posteriori estimated operational parameter as the determined operational parameter. | 03-06-2014 |
20140074364 | METHOD AND CONTROL DEVICE FOR CONTROLLING A POSITVELY LOCKING SHIFT ELEMENT OF A TRANSMISSION - A method of actuating a form-locking shift element of a transmission. To shift from a current gear to a target gear, an actuation time is determined for the locking shift element to be engaged during a gear shift depending on a reaction time of the assemblies participating during actuation of the locking shift element, an engaging time of the locking shift element, and at least one filtered signal such that the locking shift element is engaged within a specified rotational speed window encompassing a specified differential rotational speed. It is verified whether the locking shift element can be engaged within the specified rotational speed window depending on at least one unfiltered signal, and, if the locking shift element can be engaged within the specified rotational speed window, the actuation is unaffected; conversely, if the locking shift element cannot be engaged within the specified rotational speed window, the actuation is affected. | 03-13-2014 |
20140081540 | METHOD OF CONTROLLING TRANSMISSION AND TRANSMISSION SYSTEM FOR PERFORMING THE SAME - A method of controlling a transmission includes sensing an operation signal generated from an accelerator pedal sensor, performing a predetermined transmission in a predetermined transmission section from a current gear to a target gear, determining a change in the speed of the operation signal, controlling a constant value at which a release hydraulic pressure signal is maintained constant during the transmission in response to the change, controlling an increase slope of an engagement hydraulic pressure signal before the transmission is completed in response to the change, and controlling a decrease slope of the release hydraulic pressure signal before the transmission is completed in response to the change. A transmission system for performing a method of controlling a transmission is also provided. | 03-20-2014 |
20140129100 | DISTRIBUTED HIERARCHICAL CONTROL SYSTEM FOR A TANDEM AXLE DRIVE SYSTEM - A hierarchical control system for a tandem axle assembly for a vehicle is provided. The hierarchical control system includes a vehicle level controller, an actuator, a shift controller, and a sensor. The shift controller is capable of placing the tandem axle assembly in at least a first operating condition and a second operating condition using the actuator. In response to the sensor and an operating condition of at least one of the power source and the transmission of the vehicle, the shift controller adjusts a manner of placing the tandem axle assembly in at least one of the first operating condition and the second operating condition. The hierarchical control system facilitates performing a shifting procedure in an automatic manner or as desired by an operator of the vehicle without excessively increasing a cost and a complexity of the tandem axle assembly. | 05-08-2014 |
20140136061 | VEHICLE DRIVE CONTROL DEVICE - When a driver attempts to hurriedly start driving a stopped vehicle, for example, the driver may, without realizing it, begin operating an accelerator pedal before shifting a shift lever from a non-drive position to a drive position. In such a situation, when the shift lever is shifted from a non-drive position to a drive position while the accelerator pedal is being operated, a drive power limiting process is implemented for limiting the drive power when the drive power is output from a drive source in accordance with the amount that the accelerator is being operated. As a result, when the shift lever is shifted from a non-drive position to a drive position in the abovementioned manner, it is possible to restrict starting of the vehicle, which is caused by the transmission of drive power from the drive source to the wheels. This reduces the strange sensation experienced by the driver. | 05-15-2014 |
20140142823 | DUAL CLUTCH TRANSMISSION CONTROL METHOD, DUAL CLUTCH TRANSMISSION, AND VEHICLE MOUNTED THEREWITH - A method of controlling a dual clutch transmission, a dual clutch transmission, and a vehicle equipped with the same which can reduce the load on a clutch on a start gear side to reduce the wear thereof and therefore make the clutch replacement interval longer. There are a first input shaft to be connected to a first clutch and a second input shaft to be connected to a second clutch. A set of odd-numbered gears and a set of even-numbered gears are arranged respectively across the first input shaft and second input shaft and an output shaft. When a vehicle starts, a start gear and a support gear are synchronously engaged to the second input shaft and the first input shaft, respectively, and simultaneously connecting the first clutch and the second clutch partially (half clutch state) to the first input shaft and the second input shaft, respectively, the support gear having a gear ratio larger than that of the start gear by one speed or higher. | 05-22-2014 |
20140149008 | CONTROL METHOD FOR AUTOMATIC TRANSMISSION, AND AUTOMATIC TRANSMISSION SYSTEM - A control method for an automatic transmission includes a step of canceling the shift performed by a shift operation for performing shifting in the same direction as that of the shifting performed by automatic shift control, when the shift operation is performed before the input revolution speed correlation value of the automatic transmission becomes a predetermined value, after the automatic shift control has been started in a manual shift mode, a step of switching a shift stage display at a timing at which the shift operation that is to be canceled has been performed, and a step of switching the shift stage display at a timing at which the input revolution speed correlation value becomes the predetermined value when a shift operation is not performed within a period of time from when the automatic shift control is started till when the input revolution speed correlation value becomes the predetermined value. | 05-29-2014 |
20140149009 | DUAL CLUTCH TRANSMISSION CONTROL METHOD, DUAL CLUTCH TRANSMISSION, AND VEHICLE MOUNTED THEREWITH - A method of a dual clutch transmission, a dual clutch transmission, and a vehicle equipped with the same which can reduce the load on a clutch on a start gear side to reduce the wear thereof and therefore make the clutch replacement interval longer. There are a first input shaft configured to be connected to a first clutch and a second input shaft configured to be connected to a second clutch. A set of odd-numbered gears and a set of even-numbered gears are arranged respectively across the first input shaft and second input shaft and an output shaft. When a vehicle starts, an absorbed energy Eabs by the second clutch is calculated while a start gear is partially connected to the second input shaft. The first clutch is partially connected (half clutch state) to the first input shaft, to which a support gear is synchronously engaged, when the absorbed energy exceeds a set value which is a predetermined threshold, the support gear having a gear ratio greater than that of the start gear by one speed or higher. | 05-29-2014 |
20140172254 | COMPRESSION CONTROL DEVICE FOR CONTINUOUSLY VARIABLE TRANSMISSION - A compression control device for a continuously variable transmission is provided in which when estimating the torque ratio, which is the ratio of the actually transmitted torque relative to the maximum transmittable torque of the continuously variable transmission, based on the transmission characteristics for transmitting the given variable component of the input shaft to the output shaft via an endless belt, a slip identifier, which is an indicator for the ratio of the amplitude of the variable component between the input shaft and the output shaft, or a phase lag, which is an indicator for difference in phase of the variable component, is used. It is possible to improve the control responsiveness and reduce the computation load of the control device and to improve the power transmission efficiency of the continuously variable transmission while preventing the endless belt thereof from slipping. | 06-19-2014 |
20140172255 | CONTROL DEVICE AND CONTROL METHOD FOR AUTOMATIC TRANSMISSION - A control device for an automatic transmission. The control device configured to determine if the automatic transmission is in such a condition that the automatic transmission accelerates the vehicle at predetermined acceleration when the output command value is transmitted to the control device for the motor. The output command value is not cancelled if it is determined by the determining means that the automatic transmission is not in such a condition that the automatic transmission accelerates the vehicle at the predetermined acceleration, and the output command value is cancelled if it is determined by the determining means that the automatic transmission is in such a condition that the automatic transmission accelerates the vehicle at the predetermined acceleration. | 06-19-2014 |
20140188356 | VEHICLE AND CONTROL METHOD FOR VEHICLE - A vehicle includes a shift sensor and an ECU that switches a shift range based on a combination of shift signals received from the shift sensor. The ECU includes a determining unit and a switching unit. The determining unit determines, based on how a shift signal pattern has changed (the number and type of shift signals that have changed), whether or not to execute first fail-safe traveling in which a shift range before occurrence of a shift abnormality is maintained. In the event of a shift abnormality, in a case where execution of the first fail-safe traveling is permitted, the switching unit executes the first fail-safe traveling to maintain a shift range before occurrence of the shift abnormality, and in a case where execution of the first fail-safe traveling is prohibited, the switching unit executes second fail-safe traveling to switch a shift range to an N range. | 07-03-2014 |
20140200779 | CONTROL APPARATUS FOR CONTINUOUSLY VARIABLE TRANSMISSION - A control apparatus for a continuously variable transmission is capable of continuously changing an output of an internal combustion engine mounted on a vehicle and allowing a transmission mode to be switchable between a continuous transmission mode in which a transmission ratio is set continuously and a stepped transmission mode in which the transmission ratio is set stepwise. A transmission mode selector is configured to change the transmission mode in such a manner that in a case where the stepped transmission mode is selected, when a engine rotation speed reaches a first predetermined rotation speed, then falls below a second predetermined rotation speed which is lower than the first predetermined rotation speed, and further falls below a third predetermined rotation speed, the transmission mode is switched from the stepped transmission mode to the continuous transmission mode. | 07-17-2014 |
20140214291 | AUTOMATIC SHIFT APPARATUS - An automatic shift apparatus includes a rotation shaft, a dog clutch gear shift mechanism, and a control unit. The control unit controls first moving speed to be faster than second moving speed on moving a sleeve in an engaged state engaged with one of a first clutch ring and a second clutch ring to a neutral position defined at a position between the first clutch ring and the second clutch ring where the first moving speed is a speed of moving the sleeve in the engaged state to a target position defined between the neutral position and the mentioned one of the first clutch ring and the second clutch ring the sleeve is engaged with and where the second moving speed is a speed of moving the sleeve from the target position to the neutral position. | 07-31-2014 |
20140214292 | CONTROL DEVICE FOR CONTINUOUSLY VARIABLE TRANSMISSION - A control device for continuously variable transmission includes an operating state detection means for detecting an operating state of a vehicle including a vehicle speed and an accelerator pedal opening, a control means for controlling a speed ratio of a continuously variable transmission based on the operating state, an acceleration request determination means for determining the presence or absence of an acceleration request of a driver based on the accelerator pedal opening, and a speed ratio setting means for setting a speed reduction ratio controlled by the control means to be smaller with an increase in an acceleration start vehicle speed if the accelerator pedal opening is equal during acceleration. The control means updates the acceleration start vehicle speed to a vehicle speed at the time of a determination after determining that the accelerator pedal opening has been increased during acceleration. | 07-31-2014 |
20140236437 | SHIFT CONTROL DEVICE OF AUTOMATIC TRANSMISSION - A target shift stage comes to a high speed stage at t2, during reduction toward zero of a motor torque by an accelerator pedal releasing operation from t1, and an up-shift shift request along with the torque reduction is generated. The shift request is executed for the first time at t3, and the automatic transmission is shifted up to a high speed stage from a current low speed stage selecting state. Therefore, even in the case that a request for increasing a motor regenerative torque is issued by a braking operation just after (t2 to t3) an up-shift shift request moment t2 in response to the torque reduction, the gear shift in response thereto is not generated, and it is possible to avoid generation of repeated gear shift of low speed stage→high speed stage→low speed stage for a short time. | 08-21-2014 |
20140244120 | Vehicle Mass Computation - A vehicle having a drivetrain is controlled based on a difference between a torque transmitted by the drivetrain when the vehicle has constant non-zero speed and the torque transmitted by the drivetrain when the vehicle is accelerating. The drivetrain torque may be measured by a drivetrain torque sensor. The effective vehicle mass is computed from the torque difference. The computed mass of the vehicle is used to adjust the activation of a collision warning system or a collision avoidance system. A method of operating a vehicle where the activation of a collision avoidance system is adjusted based on a difference between a torque transmitted by a drivetrain when the vehicle has constant non-zero speed and the torque transmitted by the drivetrain when the vehicle is accelerating is disclosed. The torque difference is used to compute a vehicle mass that is used to adjust a collision warning distance. | 08-28-2014 |
20140244121 | AUTOMATIC TRANSMISSION - An automatic transmission capable of improving stability and reliability of connection operation of a synchronization mechanism when pre-shift control is executed, thereby making it possible to prolong the service life of the mechanism and improve marketability thereof. To change the speed position of a vehicle, one of two power transmission paths from an internal combustion engine to drive wheels is switched to the other, and pre-shift control is executed before switching the path. In doing this, when conditions for executing the pre-shift control are satisfied, whether or not a motive power fluctuation state of the engine occurs after satisfaction of the execution conditions is determined. If the motive power fluctuation state occurs, delay control for delaying the start of the pre-shift control is executed, whereas if the same does not occur, the pre-shift control is executed without executing the delay control. | 08-28-2014 |
20140249727 | CONTROL METHOD FOR A DUAL-CLUTCH TRANSMISSION - A method for controlling a drivetrain of a motor vehicle. The vehicle comprises a drive engine and a dual-clutch transmission. The dual-clutch transmission comprises a first friction clutch and a second friction clutch together with a first transmission unit and a second transmission unit, in order to establish a first power transmission branch and a second power transmission branch. The dual-clutch transmission comprising a clutch actuator device for actuating the friction clutches and a gearshift actuator device for engaging and disengaging gears of the dual-clutch transmission. The method assuming that the motor vehicle is being driven in a high original gear and comprising the following steps: derivation of a first shift signal from an actuation of a control element by the driver; calculation of a target gear, which is lower than the original gear and which corresponds to the first shift signal; selection of an intermediate gear between the original gear and the target gear, opening of the friction clutch corresponding to the original gear and closing of the friction clutch corresponding to the intermediate gear, in order to transmit drive power via the power transmission branch corresponding to the intermediate gear; and engagement of the target gear, opening of the friction clutch corresponding to the intermediate gear and closing of the friction clutch corresponding to the target gear in the event that a second shift signal is derived from an actuation of a control element by the driver. | 09-04-2014 |
20140257654 | SHIFT INDICATOR - A method and system for a shift indicator are provided. The method includes receiving a number of gears of a transmission of a vehicle, determining a plurality of average revolutions per minute (“RPM”) to vehicle speed ratios for each of the gears of the transmission, comparing a current RPM to vehicle speed ratio to the plurality of average RPM to vehicle speed ratios to determine a current gear, and based on the current gear and a current RPM, indicating to a driver of the vehicle to shift the vehicle to a new gear. The system includes components for implementing the method. | 09-11-2014 |
20140257655 | OVER CLAMPING PROTECTION METHOD AND CLAMPING MECHANISM THEREFOR - A method where the spin factor is looked up in a table; the slip factor is measured and the clamping pressure is adjusted to achieve a slip/spin ratio provided in a desired range is described herein. According to another aspect, an active mechanical clamping mechanism using a longitudinally movable contact point is also described. | 09-11-2014 |
20140288792 | CONTROLLED APPLIED RESISTANCE MULTIPLE AXIS CONTINUALLY VARIABLE DIFFERENTIAL TRANSMISSION - The embodiments disclose a method and apparatus for controlling the output ratio of the speed of operation and distribution of power/energy from a primary power source, applying continuously variable resistance using a multiple axis continually variable differential transmission to a primary power source input to adjust the rotational power level and speed output to match an operator adjustable performance speed setting at the same, slower decelerated or faster accelerated speed or power level in the same or reverse direction; and controlling the operation of the multiple axis continually variable differential transmission to match the operator desired performance speed using a programmable control system to process operator input, load stored operating parameters, and modify operating parameters based on operator input and adjusting continuously variable resistance operations. | 09-25-2014 |
20140297141 | DRIVING FORCE DISTRIBUTION CONTROL APPARATUS FOR FOUR-WHEEL DRIVE VEHICLE AND DRIVING FORCE DISTRIBUTION CONTROL METHOD FOR FOUR-WHEEL DRIVE VEHICLE - A driving force distribution control apparatus for a four-wheel drive vehicle includes a basic distribution determination device and a servo controller. The basic distribution determination device is configured to determine basic distribution of a driving force to secondary drive wheels in accordance with the driving force and driving conditions of the vehicle. The basic distribution determination device includes a tire force limit determination device and an arithmetic device. The tire force limit determination device is configured to calculate a tire required acceleration in accordance with the driving conditions of the vehicle and configured to output a basic distribution adjustment signal having a characteristic that gradually decreases a ratio of the basic distribution for the secondary drive wheels to zero in a transient region in which the calculated tire required acceleration is lower than a predetermined threshold value. | 10-02-2014 |
20140297142 | SPEED RATIO CONTROL DEVICE OF CONTINUOUSLY VARIABLE TRANSMISSION FOR VEHICLE - Speed change inhibition control for inhibiting change of the speed ratio of a continuously variable transmission (CVT) is executed when an input shaft speed of the CVT is lower than a predetermined ABS-operating-time upper-limit input shaft speed. Therefore, the speed ratio of the CVT can be changed to the largest reduction ratio until it is determined that the input shaft speed of the CVT is lower than the predetermined ABS-operating-time upper-limit input shaft speed. Thus, during ABS operation of an ABS control device before the vehicle is stopped, the speed ratio can be returned to the largest reduction ratio in a condition where engine brake force is not excessively applied, and sufficient driving force of the vehicle or starting response is obtained when the vehicle is re-started. | 10-02-2014 |
20140303858 | VEHICLE AND CONTROL APPARATUS FOR AUTOMATIC TRANSMISSION - A control apparatus for an automatic transmission includes a running condition detector and a controller. a plurality of gear change stages include at least one specific gear change stage that has a specific transmission gear ratio, that involves at least one necessary engagement mechanism which needs to be engaged in order to obtain the specific transmission gear ratio, and that involves at least one no-change engagement mechanism which causes no change in the specific transmission gear ratio. Both of the at least one necessary engagement mechanism and the at least one no-change engagement mechanism are engaged during a time period from a timing to begin an operation to change a gear change stage to the specific gear change stage until a timing to complete the operation. The at least one no-change engagement mechanism is released after the timing to complete the operation. | 10-09-2014 |
20140309897 | SYSTEM AND METHOD FOR CONTROLLING A TRANSMISSION - The present invention provides a smoother driving experience through the use of an advanced powertrain system for a vehicle. The powertrain system includes a transmission having a gear selection controller adapted to select one of a plurality of gear ratios, an electronic control unit, at least one information acquisition unit wherein the electronic control unit uses information from the information acquisition unit to determine if the vehicle is stationary and if the vehicle is on an expressway. If the electronic control unit determines the vehicle is stationary and the vehicle is on an expressway, then the electronic control unit sends a signal to the gear selection controller of the transmission to select a lower gear ratio that would normally be used to transition the vehicle from a stationary to a moving state. | 10-16-2014 |
20140324306 | METHOD OF MANAGING AVAILABLE OPERATING STATES IN AN ELECTRIC VEHICLE POWERTRAIN - A method of managing available operating states in an electrified powertrain includes: identifying a plurality of operating states; determining an allowable hardware operating speed range for each of the plurality of operating states; determining a real operating speed range for each of the plurality of operating states; determining an ideal operating speed range for each of the plurality of operating states, the ideal operating speed range being a subset of the allowable real operating speed range; indicating an operating state of the plurality of operating states as ideal-allowed if an actual output speed of the electrified powertrain is within the ideal operating speed range for that operating state; and commanding the electrified powertrain to operate within one of the operating states that is indicated as ideal-allowed. | 10-30-2014 |
20140330493 | METHOD AND APPARATUS FOR CONTROLLING THE ENGAGEMENT OF AN INPUT GEAR WITH AN OUTPUT GEAR - The present invention relates to a method of engaging an input gear with an output gear in a drivetrain ( | 11-06-2014 |
20140330494 | DEVICE FOR CONTROLLING AUTOMATIC TRANSMISSION - In a control apparatus for an automatic transmission, a gear shift from a second gear shift stage to a first gear shift stage is inhibited and the gear shift from the first gear shift stage to the second gear shift stage is continued, when, during the gear shift from the first gear shift stage to the second gear shift stage, a request of the gear shift from the second gear shift stage to the first gear shift stage by means of an automatic transmission section has occurred during a time duration from a time at which a gear shift command from the first gear shift stage to the second gear shift stage is issued to a time at which an inertia phase is started. | 11-06-2014 |
20140336889 | GRADE-BASED ANTI-HUNT TIMER - A system and method are provided for grade-based anti-hunt shift control of an automatic transmission powering a machine. A shift controller determines a recommended gear in which to operate the transmission and sets an anti-hunt timer upon recommending a shift from a first gear to a second gear. The anti-hunt timer prevents a subsequent shift back to the first gear while the anti-hunt timer is running. A grade-based controller is configured to track machine operation and to determine when the machine operational factors change such that an estimated steady state gear differs from the second gear. When such a change is encountered, the grade-based controller clears the anti-hunt timer and sets a secondary timer. The clearing of the anti-hunt timer allows a downshift to accommodate the detected grade while the setting of the secondary timer prevents a subsequent clearing of the anti-hunt timer while the secondary timer is running. | 11-13-2014 |
20140343808 | FAILSAFE DEVICE AND CONTROL METHOD FOR VEHICLE - A failsafe device for a vehicle is provided that includes a transmission of a vehicle and a controller configured to operate an oil supply unit and an emergency oil supply unit. The oil supply unit supplies oil to the transmission via a first oil channel and produces hydraulic pressure and the emergency oil supply unit supplies oil to the transmission via a second oil channel and produces the hydraulic pressure when an oil supply system fails. | 11-20-2014 |
20140343809 | Arrangement and Method for Controlling an Automatically Shifting Transmission - In an arrangement for controlling an automatically shifting transmission, as a result of a corresponding programming of an electric control device, when actuating a second selecting device, starting from the automatic mode, first an immediate upshifting or downshifting can be prompted and is permitted unless prevented by a specified condition. In the case of a brief actuation, a first or further immediate upshifting and/or downshifting can be prompted and the current or thereby reached gear will be maintained until, first, the duration of the actuation has reached the specific minimum duration and, second, the actuation of the selecting device was terminated. When the second selecting device has a first operating element for the manual triggering of an upshift command and a second operating element for the manual triggering of a downshift command, the event controlling the return to the automatic mode may be the recognition of the simultaneously present commands downshifting and upshifting. After a first actuation of the second selecting device for the purpose of a manually prompted immediate up- or downshifting, a transition may immediately take place to the automatic gear change control according to the automatic mode, if subsequently thereto, an actuation of the second selecting device for the purpose of a gear change in a direction opposite thereto takes place within a comparatively brief time window. | 11-20-2014 |
20140350808 | AUTOMATIC TRANSMISSION - An automatic transmission includes an input member, a planetary gear mechanism, a plurality of engagement mechanisms, an output member, a shift position detector, an input rotational speed detector, a controller, and a switching mechanism. The controller is configured to set the switching mechanism in a reverse-rotation prevention state when a shift position is set in a forward movement range and configured to set the switching mechanism in a fixed state when the shift position is set in a backward movement range. The controller is configured to control the plurality of engagement mechanisms so that the input member is capable of rotating and rotation of the output member is prevented in a case in which a vehicle is moving backward, the shift position is switched from the backward movement range to the forward movement range, and a vehicle speed is greater than or equal to a first predetermined speed. | 11-27-2014 |
20140372000 | SPEED CONTROL SYSTEM FOR A HYDROSTATIC TRANSMISSION - A speed control system for a hydrostatic transmission includes an engine having a drive shaft connected to a hydraulic pump. At least one hydrostatic motor is connected to the pump in a closed circuit by a flow line. Connected to the motor via a system shaft is a vehicle system. A controller is connected to a plurality of sensors and a high pressure relief valve that is connected to the flow line between the pump and the motor. Based on information received from the sensors, the controller sets the pump and motor displacements to limit the pressure to a value that will not overspeed the engine and allow the system to automatically provide braking beyond the engine's capability. This may be accomplished through the use of various algorithms. | 12-18-2014 |
20140372001 | SPEED CONTROL SYSTEM FOR HYDROSTATIC TRANSMISSION - A speed control system for a hydrostatic transmission includes an engine having a drive shaft connected to a hydraulic pump. At least one hydrostatic motor is connected to the pump in a closed circuit by a flow line. Connected to the motor via a system shaft is a vehicle system. A controller is connected to a plurality of sensors and a proportional high pressure relief valve that is connected to the flow line between the pump and the motor. Based on information received from the sensors, the controller sets the pressure relief valve to limit the pressure to a valve that will not over-speed the engine and allows the demands of the speed control system to be attained. This may be accomplished through the use of various algorithms. | 12-18-2014 |
20150032345 | FEED-FORWARD ENGINE IDLE SPEED CONTROL - A vehicle includes an engine, transmission, engine control module (ECM), and transmission control module (TCM). The transmission includes an input member and an input clutch which selectively connects a crankshaft of the engine to the input member. The TCM identifies a target clutch torque of the input clutch during a creep maneuver of the vehicle, and communicates the identified target clutch torque to the ECM. The ECM maintains engine idle speed at a threshold level through the creep maneuver and a requested launch using the target clutch torque as a feed-forward term. A method includes identifying a target clutch torque of the input clutch during a creep maneuver, and communicating the identified target clutch torque to the ECM. The idle speed is maintained at a threshold level by the ECM through the creep maneuver and a detected launch using the target clutch torque as a feed-forward idle speed control term. | 01-29-2015 |
20150032346 | METHOD FOR CONTROLLING AN AUTOMATED MOTOR VEHICLE TRANSMISSION - A method of controlling an automated motor vehicle transmission. A current driving resistance is taken into account when selecting a target gear to be engaged as part of a shifting process. In order to be able to regulate shifting processes in a driving-resistance-dependent manner so as to ensure that the motor vehicle can always able to continue driving on, during selection of the target gear, disregarding gears for shifting from a currently engaged gear, in a driving-resistance-dependent manner, when the required associated shifting times are longer than a respective permitted maximum shifting time. In connection with the above, the method is incorporated in an automated motor vehicle transmission, a computer program product and a data carrier, containing the computer program product. | 01-29-2015 |
20150039195 | CONTINUOUSLY VARIABLE TRANSMISSION - Inventive embodiments are directed to components, subassemblies, systems, and/or methods for continuously variable accessory drives (CVAD). In one embodiment, a skew-based control system is adapted to facilitate a change in the ratio of a CVAD. In another embodiment, a skew-based control system includes a skew actuator coupled to a carrier member. In some embodiments, the skew actuator is configured to rotate a carrier member of a CVT. Various inventive traction planet assemblies can be used to facilitate shifting the ratio of a CVT. In some embodiments, the traction planet assemblies include legs configured to cooperate with the carrier members. In some embodiments, a traction planet assembly is operably coupled to the carrier members. Embodiments of a shift cam and traction sun are adapted to cooperate with other components of the CVT to support operation and/or functionality of the CVT. Among other things, shift control interfaces for a CVT are disclosed. | 02-05-2015 |
20150057899 | METHOD FOR ENGAGEMENT AND DISENGAGEMENT - Method for engaging and disengaging a hydraulic motor which is adjustable in its displacement from and to a hydrostatic drive train of a hydromechanical transmission with a closed hydraulic fluid circuit. Two adjustable hydraulic motors and a hydraulic pump are arranged in parallel in the hydrostatic drive train and connected to a mechanical drive on the output side. At least one of the two hydraulic motors is connected to the mechanical drive via an assigned clutch. As appropriate to the driving situation, during operation of the other hydraulic motor and the hydraulic pump at least one of the hydraulic motors is engaged via the assigned clutch with the hydromechanical transmission from which the hydraulic motor was previously disengaged, likewise as appropriate to the driving situation. Before closing the clutch, the hydraulic motor to be engaged is accelerated load-free by deflecting its adjustment device in such a way that the rotational speed of an assigned clutch input shaft of the clutch is at least equal to the rotational speed of the clutch output shaft of the clutch which is connected to the mechanical gear. When the clutch is closed, both hydraulic motors act on a common output shaft of the mechanical gear. | 02-26-2015 |
20150066319 | METHOD FOR CONTROLLING SHIFT OF AUTOMATIC TRANSMISSION IN VEHICLE - A method for controlling a shift of an automatic transmission in a vehicle may include calculating a first long-term driving style index by using running information in the running mode, calculating a second long-term driving style index by using running information in the sports mode, when the vehicle is switched from the running mode to the sports mode, temporarily storing the first long-term driving style index at the switching point, and when the sports mode is switched to the running mode, if the second long-term driving style index is greater than the temporarily stored first long-term driving style index, updating the second long-term driving style index as a final long-term driving style index, and determining a driving style. | 03-05-2015 |
20150088392 | TRANSMISSION GEAR SHIFT INDICATION TECHNIQUES - Transmission gear shift control techniques can include calculating, at a controller of a vehicle powered by an internal combustion engine, the controller including one or more processors, brake specific fuel consumption (BSFC) for each of: (i) a current gear of a transmission of the vehicle, (ii) a lower gear than the current gear of the transmission, and (iii) a higher gear than the current gear of the transmission, wherein the transmission is one of a manual transmission and an automatic transmission operating in a manual mode. The techniques can include determining, at the controller, which of the current gear, the lower gear, and the higher gear has a smallest BSFC to obtain a desired gear of the transmission. The techniques can also include outputting, from the controller, an indication to shift the transmission to the desired gear. | 03-26-2015 |
20150088393 | METHOD FOR CONTROLLING A POWERTRAIN AND A TRANSMISSION SYSTEM - A method for controlling a powertrain includes the following steps: (a) determining whether a vehicle is coasting to a stop based on an accelerator pedal position; (b) determining whether an automatic transmission is in first gear; (c) shifting an input clutch from an engaged state to a disengaged state in order to operatively disconnect the automatic transmission from an internal combustion engine if the vehicle is coasting to a stop and the automatic transmission is not in first gear; and (d) shifting the automatic transmission to the first gear in order to allow the internal combustion engine to be shut down while the vehicle is coasting to a stop. | 03-26-2015 |
20150112558 | SYSTEM AND METHOD FOR ENHANCING THE OPERATION OF A CONTINUOUSLY VARIABLE TRANSMISSION OF A WORK VEHICLE - In one aspect, a computer-implemented method for enhancing the performance of a continuously variable transmission of a work vehicle may include engaging a range clutch of the continuously variable transmission, cycling a directional clutch of the continuously variable transmission between an engaged state and a disengaged state while the range clutch is engaged and controlling a position of a swash plate of the continuously variable transmission such that a ground speed of the work vehicle is maintained substantially at zero while the directional clutch is cycled between the engaged and disengaged states. | 04-23-2015 |
20150112559 | Method for Executing Interleaved Gearshifts - Method for executing gearshifts interlaced into each other in an automatic transmission with several shifting elements, whereas, upon the execution of gearshifts interlaced into each other, first shifting elements are open or switched off, and second shifting elements are closed or switched on, namely in such a manner that, as a second shifting element, at least one positive-locking shifting element is closed, whereby, with the activation of a positive-locking shifting element to be closed, there is a monitoring of whether, within a time interval after the activation of the particular positive-locking shifting element to be closed, the transmission ratio of the automatic transmission is within the tolerance band and is thus constant, and/or whether an end position sensor of the particular positive-locking shifting element to be closed detects a completely engaged position of the positive-locking shifting element to be closed, whereby, if at least one of these conditions is met, a proper closing of the particular positive-locking shifting element to be closed is detected, whereby if none of these conditions is met, an improper closing of the particular positive-locking shifting element to be closed is detected, and a substitute measure is initiated. | 04-23-2015 |
20150142282 | METHOD OF CONTROLLING SHIFTING OF GEARS IN HYBRID VEHICLE - A method of controlling the shifting of gears in a TMED-type hybrid vehicle may include a stage in which, in a case where it is required that a power-on upshift operation is performed simultaneously when engagement of an engine clutch is carried out in order to convert the driving mode from an electric vehicle (EV) driving mode to hybrid-electric vehicle (HEV) driving mode, simultaneously performs the engagement of the engine clutch and the shift operation, thereby improving acceleration and shifting performances and providing a quick driving response for a driver. | 05-21-2015 |
20150149052 | SYSTEM FOR CONTROLLING SHIFT OF VEHICLE - A shift control apparatus for a vehicle may include a GPS sensor detecting a vehicle location, a navigation device outputting short-distance road information and long-distance road information using the vehicle location, a vehicle controller restoring forward road information using the short-distance road information and the long-distance road information, and determining a degree of curve and an average degree of inclination of a road using the forward road information, and a vehicle shifting unit having a shift controller controlling a shift pattern of a transmission using the degree of curve and the average degree of inclination. | 05-28-2015 |
20150345621 | SYSTEMS AND METHODS FOR DYNAMIC GEAR STATE AND VEHICLE SPEED MANAGEMENT - According to one aspect of the present disclosure, a control system, apparatus, and method includes dynamic optimization of at least one of a vehicle reference speed and/or transmission gear state of a vehicle by determining current and future engine power requirements from the current and forward-looking route conditions to improve performance, drivability, and/or fuel economy of the vehicle over what is achievable through conventional gear state selection via static calibration tables and conventional shifting strategies. The selection of the vehicle reference speed and gear state can be performed independently of one another in one embodiment, and complementary of one another in another embodiment. | 12-03-2015 |
20150354699 | SYSTEM AND METHOD OF CONTROLLING SHIFTS OF AN ELECTRONICALLY CONTROLLED MECHANICAL TRANSMISSION OF A VEHICLE - A method of shifting a transmission of a vehicle. The method includes the steps of: initiating a shift from a first gear to a second gear in the transmission; disengaging a first clutch associated with the first gear; engaging a second clutch associated with the second gear; and actively modifying a pump displacement and/or a motor displacement while the disengaging step or the engaging step are carried out. The motor is drivingly coupled to the transmission. | 12-10-2015 |
20160017825 | VEHICLE CONTROL APPARATUS - A vehicle control apparatus includes a condition determination section that determines whether or not an execution permission condition to permit coasting of a vehicle is satisfied, a first control section that causes the vehicle to shift to a first inertia running state by stopping the engine and disengaging the clutch device when the execution permission condition is determined to be satisfied, an auxiliary drive request determination section that determines whether or not an auxiliary drive request to drive the auxiliary has occurred, and a second control section that causes the vehicle to shift to a second inertia running state by starting the engine keeping the clutch device disengaged when the auxiliary drive request is determined to have occurred while the vehicle is running in the first inertia running state. | 01-21-2016 |
20160017939 | VEHICLE CONTROL APPARATUS - A vehicle control apparatus includes a first control section that shifts a vehicle from a normal running state to a coasting state by disengaging the clutch device of the vehicle when a predetermined execution condition is satisfied, a second control section that releases the coasting state when a brake operation or an accelerator operation is performed by a vehicle driver while the vehicle is in the coasting state, and an operation amount determination section that determines whether or not an operation amount of a brake operation or an accelerator operation performed while the vehicle is in the coasting state exceeds a release threshold. The second control section releases the coasting state if the operation amount is determined to exceed the release threshold, and does not release the coasting state if the operation amount is determined not to exceed the release threshold. | 01-21-2016 |
20160017993 | CONTROL DEVICE FOR STEPLESS TRANSMISSION - A control device includes: a clamping force determination unit that determines a clamping force Fs so that a transmission gear ratio R of a stepless transmission is a target transmission gear ratio; a correction unit that corrects the clamping force Fs determined by the clamping force determination unit, based on an oil temperature TO of a lubricant interposed between each of pulleys and a belt and the transmission gear ratio R; and a clamping force control unit that controls clamping of the pulleys and to be performed with the clamping force Fs corrected by the correction unit. | 01-21-2016 |
20160025211 | TRANSMISSION CONTROL CIRCUIT - A transmission control circuit for controlling a system pressure provided by a pressure pump in a transmission. The circuit includes a pressure control valve and an electronic control unit. Load states and operating states of the working machine can be detected by the control unit and transmission input torque limits associated with the load states and state values representing at least one first operating state and state values representing at least one second operating state are stored therein. The first operating state corresponds with the maximum system pressure and the second operating state corresponds with a reduced system pressure compared to the maximum system pressure. The circuit includes a pressure limiting valve activated by the control unit to overrule the pressure control valve in order to variably set the reduced system pressure. | 01-28-2016 |
20160031527 | BICYCLE ELECTRONIC SYSTEM AND RELATED METHOD - A method for actuating a bicycle electronic gearshift comprising the steps of: receiving a signal indicative of the heart rate of a cyclist using the bicycle; receiving a signal indicative of the power delivered by the cyclist; calculating a performance index as a function of the value of the signal indicative of the power and of the value of the signal indicative of the heart rate; obtaining a reference value for the performance index; comparing the calculated performance index with the reference value of the performance index; and, emitting a control signal as a function of the outcome of comparing step. | 02-04-2016 |
20160033034 | METHOD OF CONTROLLING A TRANSMISSION - A method of controlling a transmission includes selecting a target speed of a second shaft, and measuring a second speed of the second shaft and an output speed of an output shaft. The method includes detecting a rolling neutral condition wherein a first and second clutch are uncoupled from a torque generator and a synchronizer is mated to a predicted gear to apply a load in a direction, and one of a first condition wherein the output speed is decreasing and the target speed is less than the second speed and a second condition wherein the output speed is increasing and the target speed is less than the second speed. The method then includes translating the synchronizer away from the predicted gear, coupling and decoupling the second clutch to and from the torque generator, and mating the synchronizer to the predicted gear to again apply the load in the direction. | 02-04-2016 |
20160047464 | SHIFT CONTROL DEVICE AND METHOD OF CONTROLLING SHIFT CONTROL DEVICE - Every time a specified time AT elapses, this shift control device calculates a target drive force Fd (a step S | 02-18-2016 |
20160059862 | Work Vehicle - Controlling means of a work vehicle includes, as speed change output setting data indicative of relationship between operational positions of the operational pedal and outputs from a stepless speed change device, first data for setting a deceleration completion position of the operational pedal where the output from the stepless speed change device is zero to provide a larger operational amount of the operational pedal from a stepping release position and second data for setting the deceleration completion position to provide a smaller operational amount of the operational pedal from the stepping release position. | 03-03-2016 |
20160076640 | METHOD FOR CONTROLLING A SHIFT PROCESS OF AN AUTOMATIC GEARBOX AND CONTROLLER - A method for controlling a shift process of an automatic gearbox for a vehicle with an internal combustion engine as its engine, including specifying a shift strategy in a controller, by continuously predictively determining the behaviour of the engine following any shift process into a target gear on the basis of a current detected vehicle dynamic value, a current detected vehicle specific actual value, and/or a current detected engine specific actual value. The prediction results are taken into account and adapted shift thresholds are determined and specified as upshift thresholds or downshift thresholds for a fuel efficient shift. A control command for a corresponding automatic shift process is output after exceeding a shift threshold. The current temperature of at least one component of the engine exhaust system is taken into account during the specification of an adapted shift threshold. | 03-17-2016 |
20160076645 | SHIFT-BY-WIRE CONTROL APPARATUS - A shift-by-wire control apparatus includes: a first detector that detects a first vehicle state; a second detector that detects a second vehicle state; an auto parking controller that executes an auto parking control irrespective of a state of a shift range, on conditions that detection results derived from the first and second detectors satisfy respective predetermined conditions; and a malfunction determining unit that determines that the first detector is malfunctioning, on a condition that the first detector fails to detect a change in the first vehicle state. The auto parking controller executes, based on the detection result derived from the second detector, the auto parking control irrespective of the detection result derived from the first detector, on a condition that the first detector is determined by the malfunction determining unit as malfunctioning. | 03-17-2016 |
20160082978 | DRIVING ASSISTANCE APPARATUS AND DRIVING ASSISTANCE METHOD - A driving assistance apparatus includes: a surrounding object detection device configured to detect an object in the surroundings of a vehicle; detected object classification unit configured to classify the object detected by the surrounding object detection device to predetermined types; traveling risk level determination unit configured to determine the traveling risk level of each road section as an index indicating the degree of the risk upon traveling in each road section based on the predetermined types of the objects classified by the detected object classification unit; and a traveling risk level recording unit configured to record the traveling risk level of the each road section determined by the traveling risk level determination unit. | 03-24-2016 |
20160102760 | Method for Operating an Automatic Transmission - A method for operating an automatic transmission is provided. The method includes disengaging a shifting element of the automatic transmission and measuring an input speed of the automatic transmission while the shifting element is disengaging. A command pressure of the shifting element is adjusted to a target command pressure based at least in part on the input speed of the automatic transmission while the shifting element is disengaging. | 04-14-2016 |
20160129909 | CONTROLLER FOR VEHICLE - A controller for vehicle, the vehicle including plural engagement elements for performing engagement operation by hydraulic pressure, the plural engagement elements having a common engagement element being an engagement element common to plural transmission gear stages, the common engagement element being an engagement element that is brought into an engaged state for establishing a transmission gear stage immediately before start of economic running and a transmission gear stage immediately after cancellation of the economic running, the controller includes at least one electronic control unit configured to stop an engine in the case where a specified economic running start condition is established and switch the plural engagement elements between the engaged states and disengaged states such that the common engagement element is switched from the engaged state to the disengaged state after another engagement element that is brought into the engaged state together with the common engagement element. | 05-12-2016 |
20160146342 | AUTOMATIC TRANSMISSIONS AND METHODS THEREFOR - Systems and methods for controlling transmissions and associated vehicles, machines, equipment, etc., are disclosed. In one case, a transmission control system includes a control unit configured to use a sensed vehicle speed and a commanded, target constant input speed to maintain an input speed substantially constant. The system includes one or more maps that associate a speed ratio of a transmission with a vehicle speed. In one embodiment, one such map associates an encoder position with a vehicle speed. Regarding a specific application, an automatic bicycle transmission shifting system is contemplated. An exemplary automatic bicycle includes a control unit, a shift actuator, various sensors, and a user interface. The control unit is configured to cooperate with a logic module and an actuator controller to control the cadence of a rider. In one embodiment, a memory of, or in communication with, the control unit includes one or more constant cadence maps that associate transmission speed ratios with bicycle speeds. | 05-26-2016 |
20160176407 | TWO-SPEED TRANSFER CASE WITH NON-SYNCHRONIZED RANGE SHIFT MECHANISM AND ON-THE-MOVE RANGE SHIFT CONTROL SYSTEM | 06-23-2016 |
20160178053 | ELECTROMAGNETIC VALVE CONTROL SYSTEM AND A METHOD OF CONTROLLING THE ELECTROMAGNETIC VALVE | 06-23-2016 |
20160195186 | VEHICLE CONTROL SYSTEM AND METHOD | 07-07-2016 |
20160375958 | BICYCLE TRANSMISSION CONTROL APPARATUS - A bicycle transmission control apparatus is provided that can perform a shift control according to the traveling environment of the bicycle. The bicycle transmission control apparatus includes a controller that operates a transmission according to a parameter that represents a traveling state of a bicycle and predetermined shifting conditions. The controller sets the predetermined shifting condition based on the parameter representing a running state of the bicycle and on a tilt angle of the bicycle. | 12-29-2016 |
20170234422 | Flow Output Determination Method for a Hydraulic Pump in a Transmission Hydraulic System | 08-17-2017 |
20180023699 | CONTROL APPARATUS FOR AUTOMATIC TRANSMISSION AND CONTROL METHOD FOR AUTOMATIC TRANSMISSION | 01-25-2018 |