Class / Patent application number | Description | Number of patent applications / Date published |
477079000 | Clutch and transmission controlled | 70 |
20080234099 | Control Valve Assembly for Controlling a Starting Clutch of an Automatic Transmission - The invention involves a control valve arrangement to activate at least one start-up clutch of a motor vehicle automatic transmission with at least one clutch control valve ( | 09-25-2008 |
20090215584 | HYDRAULIC CONTROL FOR A DUAL CLUTCH TRANSMISSION - A dual clutch transmission which has a first clutch, actuated by a first hydraulic cylinder, a second clutch, actuated by a second hydraulic cylinder, shift devices for shifting gears, which are actuated by respective hydraulically operated cylinders, a hydraulic energy source for supplying the hydraulic cylinders and the hydraulically operated cylinders with hydraulic energy and a third clutch that is actuated by a third hydraulic cylinder. | 08-27-2009 |
20090215585 | HYDRAULIC CONTROL FOR A DUAL CLUTCH TRANSMISSION - A dual clutch transmission which has a first clutch, actuated by a first hydraulic cylinder, a second clutch, actuated by a second hydraulic cylinder, shift devices for shifting gears, which are actuated by respective hydraulically operated cylinders, and a hydraulic energy source for supplying the hydraulic cylinders and the hydraulically operated cylinders with hydraulic energy. The hydraulic energy source has a first pump, a second pump and an electric drive driving the second pump. | 08-27-2009 |
20090280954 | DUAL CLUTCH TORQUE CONVERTER CONTROL SYSTEM - A system for controlling a dual clutch torque converter that allows for independent control of the dual clutches includes a first valve assembly, a second valve assembly, a first solenoid, and a second solenoid. The first valve assembly is operable to control whether the dual clutches are released, trimmed, or engaged. The second valve assembly is operable to control which of the dual clutches are released, trimmed, or engaged. The first solenoid is operable to control the position of the first valve assembly and the second solenoid is operable to control the position of the second valve assembly. | 11-12-2009 |
20090280955 | MULTI-GROUP TRANSMISSION OF A MOTOR VEHICLE - The invention concerns a multi-group transmission of a motor vehicle with at least two transmission groups ( | 11-12-2009 |
20090305845 | AUTOMATIC DISENGAGING/ENGAGING METHOD OF A CLUTCH DEPENDENT POWER TAKE-OFF - An automatic disengaging method for a master clutch dependent power take-off (PTO) arranged in a vehicle for preventing undesired movement or actions of the implements associated with the PTO and undesired wear of a clutch collar (release bearing). The PTO is driven by an engine via a master clutch between a crankshaft of the engine and an input shaft in a gearbox. The gear box further comprises an output shaft which is powered by the input shaft, optionally via an intermediate shaft. A power take-off is connected to the input shaft or, optionally, to the intermediate shaft. The system further includes a control unit connected to the master clutch and the gear box. When the control unit registers that the master clutch is disengaged, a gear is engaged in the gearbox and certain conditions are fulfilled (e.g. a parking brake has been actuated for a certain time), the control unit performs the operations of putting the gearbox in a neutral position, disable the power take-off, if the power take-off is enabled, and engage the master clutch. | 12-10-2009 |
20100041514 | Control Apparatus for an Automatic Transmission - A transmission system in a vehicle using a motor to transmit power assists acceleration by generating auxiliary engine power during acceleration in addition to gear changing by the motor. Where acceleration assistance is added, torque transition is conducted along a torque transmission route of dog clutch, second intermediate shaft, motor, first intermediate shaft, and gear position of first intermediate shaft before shifting so as to avoid the torque reduction in uncomfortable shocks and feelings to the driver due to torque reduction when shifting. | 02-18-2010 |
20100113217 | SYNCHRONOUS STATE DETERMINATION METHOD FOR AUTOMATIC DUAL CLUTCH TRANSMISSION - A method for determination of the synchronization point of an automatic double clutch transmission comprising two component transmissions each with one input shaft that connects via a friction clutch to the drive shaft of a motor and several gears, each shifted via a friction-synchronized gear clutch. The method includes the steps of selecting the gear clutch of a gear of a momentarily load-free component transmission; moving the associated gear setter to the neutral position as needed; successive movement of the associated gear setter in the direction of the shifting position of the selected gear until synchronous running is attained on the gear clutch within an applicable threshold; determination of the current synchronization point of the gear clutch from the current adjustment parameter of the associated gear setter; and adaptation of the valid synchronization point of the gear clutch to the current synchronization point. | 05-06-2010 |
20100234177 | METHOD FOR OPERATING AN AUTOMATIC OR SEMI-AUTOMATIC TRANSMISSION OF A HEAVY VEHICLE WHEN IN IDLE-DRIVING MODE - A method for operating a semi-automatic or automatic mechanical transmission of a heavy truck when driving at idle speed is provided. The method includes supplying fuel to the engine of the heavy truck at a rate that facilitates engine-idle operation. In another step, the method engages the automatic or semi-automatic transmission in a gear higher than the starting gear of the transmission and permits the truck to operate at a first substantially uniform driving velocity under engine-idle power. Depending upon traffic and environmental requirements which require a higher speed, the driver upshifts the semi-automatic or automatic transmission by depressing a control device for manual gear selection arranged on a gear shift lever of the truck and then drives the truck at a second substantially uniform driving velocity under engine-idle power. The second substantially uniform driving velocity is greater than the first substantially uniform driving velocity. | 09-16-2010 |
20100331141 | DEVICE FOR REDUCING THE DROP IN TRACTIVE FORCE - A device for reducing the drop in tractive force during the gear shifting phase of an automatic transmission ( | 12-30-2010 |
20110092335 | HYDRAULIC CONTROL SYSTEMS FOR DUAL CLUTCH TRANSMISSIONS - The present invention comprehends a plurality of embodiments of a hydraulic control system for various configurations of dual clutch transmissions. The hydraulic control systems all include a regulated source of pressurized hydraulic fluid including an electric pump, a filter and an accumulator, a pair of pressure control valves and a branching hydraulic circuit including pressure or flow control valves, spool or logic valves and two position valves which collectively supply and exhaust hydraulic fluid from a plurality of shift actuators. The actuators are connected to shift rails which include shift forks and are slidable to engage synchronizers and positive clutches associated with the various gear ratios. | 04-21-2011 |
20110300991 | Control of Torque Direction Transition in a Powershift Transmission - A method for controlling a torque direction transition in a dual clutch transmission includes decreasing a torque capacity of a transmission input clutch when clutch slip reaches a target slip during a power-off condition, producing a subsequent power-on condition, and increasing torque capacity of said clutch when clutch slip reaches a second target slip. | 12-08-2011 |
20120010045 | METHOD FOR STARTING AN ENGINE - A method for improving starting of an engine that may be repeatedly stopped and started is presented. In one embodiment, the method adjusts a transmission actuator in response to engine combustion during an engine start. The method may improve vehicle launch for stop/start vehicles. | 01-12-2012 |
20120035018 | CLUTCH CONTROL METHOD - A clutch control may include a starting clutch that is disposed at a rear portion of an engine, an automatic transmission that is disposed at a rear portion of the starting clutch and uses a shifting element to vary a rotation ratio between an input shaft and an output shaft thereof, a driving wheel that receives a torque of the engine through the starting clutch and the automatic transmission to move a vehicle, and a control portion that combinatively slips the starting clutch and the shifting element. Accordingly, the starting clutch and the shifting element (clutch element or brake element) of the transmission are combinatively slip-controlled such that the friction energy is reduced, and the durability and the transmission efficiency are improved. | 02-09-2012 |
20120115680 | TRANSMISSION DEVICE AND CONTROLLING METHOD THEREOF - A transmission configured with a speed change control unit which, when upshifting the speed in an accelerator on condition, executes an engagement control including a torque phase control after executing a filling control, which controls the hydraulic control unit in such a way that a hydraulic servo of the engagement side frictional engagement element is filled with hydraulic oil, and a standby control, which controls the hydraulic control unit in such a way that hydraulic pressure for the hydraulic servo is maintained at a preset standby pressure. A correction unit is configured to correct at least one of an execution time of the filling control and the standby pressure to an increment side when a fluctuation in a rotational acceleration of the input shaft exceeding a preset determination reference is detected after the standby control. | 05-10-2012 |
20120178586 | METHOD FOR OPERATING A DRIVE TRAIN - A method of operating a drive-train which comprises an automated shift transmission having an unsynchronized main transmission and a synchronized downstream group that is drivingly coupled downstream from the main transmission. An input shaft of the automated transmission is connected, via a clutch, to a drive aggregate and an output shaft of the automated transmission is connected to a drive axle. When the vehicle is driven and the main transmission is in a neutral position, if the drive aggregate malfunctions, to engage a gear, the downstream group is adjusted to stop transmitting power and thereby coast to a stop. A shifting impulse is applied to a shifting cylinder of the main transmission so that shifting elements, of the main transmission, ratchet over one another and eventually mesh thus engaging the main transmission, and once the main transmission is engaged, the downstream group is brought to a power-flow-transmitting position. | 07-12-2012 |
20120220422 | METHOD FOR CONTROLLING A ROLLING OR COASTING FUNCTION OF A VEHICLE - A method of controlling a rolling or coasting function of a vehicle with a drive train having a drive motor, an automatic or automated transmission, a controllable shifting means, a brake device and a drive speed control device. The vehicle speed is regulated by the drive speed control device and the braking device is activated, as needed, when driving on a downhill gradient section. To effectively and reliably use the rolling or coasting function in suitable driving situations, taking into account the influence of the driving speed control device, a rolling or a coasting condition for a downhill gradient taper is checked, when driving on the downhill gradient section, and, when the rolling or coasting condition is satisfied, the transmission controls interrupt the flow of power in the drive train before the vehicle entering a flat area, and/or before the driving speed control device generates an engine torque request. | 08-30-2012 |
20120252629 | METHOD FOR MONITORING THE OPERATION OF A DRIVE TRAIN - A method for monitoring the operation of a drive train of a motor vehicle, the drive train including a drive machine, a clutch and an automated transmission, and the drive train having an emergency program, which enables an emergency operation of the drive train even if important control signals such as engine torque, engine speed, transmission speed are missing, where the emergency operation is initiated as soon as one of the following signals is no longer present: engine torque or a substitute value for the engine torque, torque requested by a driver or a substitute for the torque requested by the driver, engine speed, transmission input speed. | 10-04-2012 |
20120264567 | METHODS AND SYSTEMS FOR ASSISTED DIRECT START CONTROL - Methods and systems are provided for pressurizing a transmission hydraulic circuit including a transmission mechanical pump coupled to an engine though a gearbox. One example method comprises, during an engine start, adjusting a speed ratio between the transmission pump and the engine between a first speed ratio and a second speed ratio, the pump rotating faster relative to the engine at the first speed ratio as compared with the second speed ratio. In this way, the pump may be driven at different speed ratios relative to the engine to provide better pressurization in the transmission. | 10-18-2012 |
20120283066 | SHIFT-BY-WIRE GEARSHIFT CONTROL APPARATUS - In a shift-by-wire gearshift control apparatus, even if a switching anomaly in which switching between forward and reverse gears is not possible has occurred, transmission of driving power to the output shaft | 11-08-2012 |
20120322615 | 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. | 12-20-2012 |
20120329604 | SYSTEM AND METHOD FOR IMPROVED CLOSED THROTTLE DOWNSHIFTS - A control system for a transmission coupled to an engine includes first, second, and third modules. The first module detects a closed throttle downshift of the transmission. The second module detects a request for a power-on downshift of the transmission. The third module controls a clutch of the transmission when the request for the power-on downshift is detected during the closed throttle downshift, wherein the third module one of (i) decreases a pressure applied to the clutch to a first predetermined pressure before an end of the closed throttle downshift and (ii) controls a pressure applied to the clutch to a second predetermined pressure at the end of the closed throttle downshift. | 12-27-2012 |
20130035205 | METHOD FOR OPERATING A VEHICLE DRIVE TRAIN HAVING A DRIVING MACHINE AND HAVING A TRANSMISSION APPARATUS HAVING A PLURALITY OF SHIFT ELEMENTS - A method of operating a vehicle drive train having a drive machine, a transmission apparatus having a plurality of shift elements and an output drive. The plurality of shift elements are engaged or disengaged in a power flow for achieving different transmission ratios within the transmission apparatus. The output drive is coupled to a transmission output shaft and the drive machine is coupled to a transmission input shaft of the transmission apparatus. Upon a request to interrupt power flow within the transmission apparatus, between the transmission input shaft and the transmission output shaft, a maximum number of shift elements are transferred to and/or held in an engaged operating state, and the remaining portion of the shift elements are transferred to and/or held in a disengaged operating state with the transmission output shaft being rotatable. | 02-07-2013 |
20130109532 | CONTROLLED VEHICLE LAUNCH USING A STEPPED RATIO TRANSMISSION | 05-02-2013 |
20130116087 | VEHICLE DRIVING SYSTEM AND CONTROL METHOD THEREOF - One-way clutches OWC | 05-09-2013 |
20130225366 | METHOD FOR OPERATING A MOTOR VEHICLE AND A CONTROL DEVICE FOR SAID VEHICLE - A method of operating a motor vehicle having a drive aggregate, a transmission and a hydraulic system. The transmission has shift elements and, for each gear, only a portion of the elements are engaged while a remainder are disengaged. The hydraulic system has main pump driven by the drive aggregate and an auxiliary pump. The method tests the functionality of the auxiliary pump. The drive aggregate and the main pump are insufficiently driven such that the shift elements can not engage. The auxiliary pump is driven to provide required pressure such that all but one of the shift elements fully engages. The remaining shift element is then first engaged up to its engagement point and then either engaged beyond its engagement point or another unengaged shift element is engaged beyond its engagement point. The functionality of the auxiliary pump is determined based on changes in the drive aggregate's rotational speed. | 08-29-2013 |
20130244831 | CONTROL DEVICE OF VEHICLE POWER TRANSMISSION DEVICE - It is provided a control device of a vehicle power transmission device including a transmission capable of fixing a rotating member with either of engagement of a one-way clutch or engagement of an engagement device, the transmission having a predetermined shift stage formed on condition that at least the rotating member is fixed, if an input torque to the transmission is changed after the engagement of the engagement device, a torque capacity of the engagement device being temporarily reduced without changing the predetermined shift stage, and if a request for applying a driven torque is made during reduction of the torque capacity of the engagement device, the temporarily reduced torque capacity of the engagement device being recovered, and the driven torque being increased depending on a recovery status of the torque capacity. | 09-19-2013 |
20130267381 | CONTROL APPARATUS FOR VEHICULAR AUTOMATIC TRANSMISSION - A control apparatus for a vehicular automatic transmission configured to selectively establish a plurality of shift positions by engaging respective combinations of two frictional coupling devices of a plurality of frictional coupling devices, with output hydraulic pressures of respective ones of a plurality of solenoid valves provided in a hydraulic control circuit, includes: a normal-state output regulation control portion and an electrically-normal-state determining portion. | 10-10-2013 |
20140004999 | CONTROL DEVICE FOR VEHICLE, AND MOTORCYCLE | 01-02-2014 |
20140011634 | AUTOMATED MANUAL TRANSMISSION FOR VEHICLE - An automated manual transmission for a vehicle may include a shifting section provided with a plurality of shifting units for implementing different gear ratio between an input shaft and an output shaft, and a variable power transfer unit transferring continuously and variably power of a power providing device to the shifting section in series by self-controllable slip operation, wherein the variable power transfer unit may be disposed between the power providing device and the shifting section. | 01-09-2014 |
20140011635 | METHOD FOR STARTING AN ENGINE - A method for improving starting of an engine that may be repeatedly stopped and started is presented. In one embodiment, the method adjusts a transmission actuator in response to engine combustion during an engine start. The method may improve vehicle launch for stop/start vehicles. | 01-09-2014 |
20140080666 | CLUTCH ARRANGEMENT AND DRIVETRAIN FOR A MOTOR VEHICLE - A clutch arrangement for a drivetrain of a motor vehicle. The clutch arrangement has a first clutch, a second clutch, and a hydraulic actuator arrangement. The actuator arrangement has a first hydraulic cylinder for actuating the first clutch and a second hydraulic cylinder for actuating the second clutch. The actuator arrangement has an actuator pump which is driven by means of an electric motor and which can be operated in two directions of rotation. The actuator pump has a first port, which is connected to the first hydraulic cylinder, and a second port, which is connected to the second hydraulic cylinder. The actuator arrangement actuates the first or the second clutch depending on the direction of rotation of the actuator pump. | 03-20-2014 |
20140135170 | DIRECT POWER REVERSING DRIVE AXLE - A drive axle assembly includes a drive axle configured to rotate with a driving torque, a first clutch pack assembly located at an end of the drive axle, and a second clutch pack assembly located at an opposite end of the drive axle. A first drive wheel assembly is operatively connected to the first clutch pack assembly, wherein the first clutch pack assembly is configured to convert the driving torque of the drive axle to a first driving torque of the first drive wheel. A second drive wheel assembly is operatively connected to the second clutch pack assembly, wherein the second clutch pack assembly is configured to convert the driving torque of the drive axle to a second driving torque of the second drive wheel. | 05-15-2014 |
20140171263 | METHOD FOR SHIFT CONTROL OF AN AUTOMATED GROUP GEAR - A method of controlling a shift of an automated group gearbox having a multi-step main transmission and a trailing two-step range group. An input shaft of the main transmission is driven by a drive device. The main transmission and a range group have synchronization devices with shift clutches. Each synchronization device, for the main transmission, has two shift positions for respective gear ratio steps and a neutral position and the range group synchronization device has only two shift positions to shift between two gear ratios steps. To accelerate range shifts, when synchronizing the range group, the main transmission input shaft is synchronized by controlling external synchronization aids to a target rotational speed at which either after the synchronization and shifting of the gear ratio step of the range group or independently from the current synchronization condition of the range group, the target gear ratio is engaged in the main transmission. | 06-19-2014 |
20140243150 | Gearing Control Method for Automatic Gear Mechanism - Disclosed herein is a method for controlling gear shifting of an automatic transmission from an N gear stage to an N′ gear stage. The gear shifting is embodied by means of engaging and releasing friction elements. The method includes selecting at least two among an rpm of a turbine, an rpm of a first motor generator (MG1), an rpm of a second motor generator (MG2) and an rpm of a planetary gear set as control factors, and controlling engagement and release of the friction elements using the control factors. | 08-28-2014 |
20140274555 | AUTOMATIC TRANSMISSION SHIFT CONTROL BASED ON TRANSMISSION INPUT SHAFT TORQUE SIGNAL - A system and method for minimizing torque disturbances during a shift event for an automatic transmission control actual transmission input shaft torque using a transmission input shaft signal produced by an input shaft torque sensor. The torque sensor provides a signal to a controller that monitors the measured transmission input torque. The torque sensor may be implemented by a strain gauge, a piezoelectric load cell, or a magneto-elastic torque sensor. The system may include a vehicle powertrain having an engine, a transmission coupled to the engine via a torque converter, an input torque sensor coupled to the input shaft of the transmission and a controller configured to control engine torque to cause the measured transmission input shaft torque to achieve a target transmission input shaft torque during the shift event. | 09-18-2014 |
20140274556 | AUTOMATIC TRANSMISSION SHIFT CONTROL BASED ON TORQUE PHASE DETECTION USING MEASURED TRANSMISSION INPUT TORQUE - A system and method for controlling a vehicle powertrain having a transmission to improve shift quality to detect the start of a torque phase of the shift based on a measured transmission input shaft torque. A torque sensor provides a signal to a controller that monitors initial rise time of the measured transmission input shaft torque. The torque sensor may be implemented by a strain gauge, a piezoelectric load cell, or a magneto-elastic torque sensor. The system may include a vehicle powertrain having an engine, a transmission coupled to the engine via a torque converter and a controller configured to initiate torque phase control when the slope of the transmission input shaft torque exceeds a predetermined threshold after initiation of the shift preparatory phase. | 09-18-2014 |
20140274557 | PRESSURE TESTING OF WELL SERVICING SYSTEMS - An apparatus and methods for testing and pumping through a well servicing system are provided. The apparatus includes a drive mechanism and an actuation system. The actuation system is coupled to the drive mechanism for selectively engaging the drive mechanism to a drive train of the well servicing system's pumping equipment for pressure testing and low rate pumping of the well servicing system without using the primary mover of the pumping equipment. A method for hydrostatic pressure testing of the well servicing system includes putting a transmission of the drive train into neutral and containing the well servicing system, then engaging the drive mechanism to the drive train and activating the drive mechanism to drive the drive train for pumping and compressing test fluid into the well servicing system without using the primary mover. And a method for low rate pumping of an open well servicing system includes putting the transmission of the drive train into neutral, engaging the drive mechanism to the drive train, and activating the drive mechanism to drive the drive train for pumping fluid into the well servicing system at a predetermined flow rate without using the primary mover. | 09-18-2014 |
20140274558 | BIDIRECTIONAL INPUT UNIDIRECTIONAL OUTPUT DRIVEN VEHICLE HAVING CLUTCH DEVICE AT LOAD END - The present invention is provided with a manual input device capable of bidirectional inputting, the output end thereof is served to output to the input end of a bidirectional input unidirectional output transmission device, the output end of the bidirectional input unidirectional output transmission device performs output in a constant rotating direction, so a loading wheel set can be driven through an engaging or releasing operational clutch device ( | 09-18-2014 |
20140287872 | Clutch Torque Trajectory Correction to Provide Torque Hole Filling during a Ratio Upshift - A control system and method for controlling a multiple gear ratio automatic transmission in a powertrain for an automatic transmission having pressure activated friction torque elements to effect gear ratio upshifts. The friction torque elements are synchronously engaged and released during a torque phase of an upshift event as torque from a torque source is increased while allowing the off-going friction elements to slip, followed by an inertia phase during which torque from a torque source is modulated. A perceptible transmission output torque reduction during an upshift is avoided. Measured torque values are used during a torque phase of the upshift to correct an estimated oncoming friction element target torque so that transient torque disturbances at an oncoming clutch are avoided and torque transients at the output shaft are reduced. | 09-25-2014 |
20140296031 | POWER UNIT FOR VEHICLE AND FOUR-WHEELED VEHICLE - A clutch actuator and a speed change actuator are disposed so as to be adjacent to each other on one side of an engine main body along the axis of a crankshaft. The clutch actuator is provided with a manual clutch operating part capable of being manually operated. The speed change actuator is provided with a manual speed change operating part capable of being manually operated. | 10-02-2014 |
20140329642 | METHOD FOR CALIBRATING A DETECTOR IN A DAMPING ASSEMBLY - A method for calibrating a detector of a damping assembly in a vehicle is disclosed. The damping assembly comprises a damper for connecting a transmission shaft of a transmission system of the vehicle to a driving shaft, the method comprising the step of applying different torques at the damping assembly by generating losses at different working conditions of the transmission system, so that the damper can be compared to a damper of a reference vehicle for each of said different working conditions. | 11-06-2014 |
20150038294 | METHOD FOR CONTROLLING A TRANSMISSION COUPLED TO AN ENGINE THAT MAY BE AUTOMATICALLY STOPPED - Methods and systems for controlling a transmission coupled to an engine during an engine start are presented. In one example, a method adjusts a transmission tie-up force in response to an indication of transmission slip. The method may improve vehicle launch for stop/start vehicles. | 02-05-2015 |
20150080177 | TRANSMISSION DEVICE - A compact transmission device that alleviates shift shock and avoids engine stall at the time of deceleration. A discharge resistance changing unit changes discharge resistance of a clutch oil pressure on a side where a clutch is disconnected due to swapping of clutches in two stages. During a shift period where the clutch on a connection side is changed over from a disconnection state to a connection state, an invalid filling zone where a friction force is not generated on a clutch plate is provided. A control unit controls the discharge resistance changing unit at a time of the shift change such that the clutch on a disconnection side is brought into a state where a friction force is not generated after finishing a half clutch zone when the clutch on a connection side is in a half clutch zone after the invalid filling zone is finished. | 03-19-2015 |
20150111696 | CONTROL SYSTEM FOR FOUR-WHEEL-DRIVE VEHICLE - In a control system, a transfer is connected to a rotation member between a driving power source and primary driving wheels and distributes dynamic power of the driving power source to secondary drive wheels. A driving power transmission shaft transmits the dynamic power of the driving power source distributed by the transfer to the secondary drive wheels. A connection-disconnection mechanism is disposed between the rotation member and the driving power transmission shaft. First and second clutches are disposed respectively between the driving power transmission shaft and right and left wheels of the secondary drive wheels. The electronic control unit is configured, when switching from a two-wheel-drive running state to a four-wheel-drive running state on the basis of a vehicle running state, to generate a transmission torque in the first clutch or the second clutch after controlling the connection-disconnection mechanism to engage the connection-disconnection mechanism. | 04-23-2015 |
477080000 | Speed responsive control | 25 |
20080234100 | Control Valve Arrangement for Controlling a Starting Clutch of an Automatic Transmission - A control valve arrangement having a clutch regulation valve ( | 09-25-2008 |
20080242502 | Vehicle overspeed system implementing impeller clutch lockout - An overspeed system for a vehicle is disclosed. The overspeed system may have a power source, a transmission unit, and a torque converter assembly operatively coupling the power source to the transmission unit. The overspeed system may also have a travel speed sensor configured to generate a signal indicative of a vehicle speed, and a controller in communication with the torque converter assembly and the travel speed sensor. The controller may be configured to prevent a decoupling of the torque converter assembly in response to the signal. | 10-02-2008 |
20080300104 | SYSTEM AND METHOD OF CONTROLLING AN UPSHIFT IN AUTOMATIC TRANSMISSION - An upshift control system for use in an automatic transmission including first and second friction elements, the upshift control system including a control unit that determines variation in an engagement capacity of the first friction element or an engagement capacity of the second friction element on the basis of combination of occurrence or non-occurrence of engine racing and compared lengths between a first time that elapses from output of a shift command to a start of an inertia phase and a second time that elapses from the out output of a shift command to a start of change in an actual gear ratio toward a target gear ratio to be achieved after the shifting, and performs a learning correction of a command pressure for the first friction element or a command pressure for the second friction element on the basis of the determination result. | 12-04-2008 |
20090011900 | GEAR CHANGE CONTROL DEVICE AND METHOD - A gear change control device is provided for a straddle-type vehicle having a clutch and a transmission. The device includes a clutch actuator configured to engage and disengage the clutch. A transmission actuator is configured to change a gear of the transmission. At least one sensor is configured to sense an operational condition of the straddle type vehicle. At least one switch is configured to generate a gear change command. A controller is operatively connected to the clutch actuator, the transmission actuator, the at least one sensor, and the at least one switch. The controller is configured to change gears in response to the gear change command and during the gear change reengage the clutch under either a first control routine or second, different control routine based upon the operational condition of the straddle-type vehicle determined by the at least one sensor. | 01-08-2009 |
20090023551 | METHOD FOR ADAPTING GEAR SELECTION IN A VEHICLE - A method for adapting gear selection in a vehicle, the vehicle including an engine with an engine output shaft connected to an automated mechanical transmission via a clutch, a transmission output shaft connected to at least one driven wheel of the vehicle, an arrangement for registering whether a towed vehicle is connected to said vehicle, and at least one control unit for receiving input signals including signals indicative of the towed vehicle connection, and for processing the signals in accordance with programmed logic rules to issue gear selection command output signals to the transmission for gear shifting, where the control unit, when sensing that a towed vehicle has been connected to the vehicle, changes an originally selected first gear to a lower second gear having a higher starting gear ratio compared to the first gear. The towed vehicle connection registering arrangement registers at least bounce from when the vehicle bounces into the towed vehicle for connecting the towed vehicle to the vehicle. A more sure registration of whether a towed vehicle is connected to the vehicle or not is obtained. | 01-22-2009 |
20090042691 | Control device for vehicular power transmitting apparatus - A control device for a vehicular power transmitting apparatus, having engaging devices including a one-way clutch, is disclosed which prevents a locked state of the one-way clutch from causing the occurrence of slippages of other engaging devices to avoid a drop in durability of the engaging device. To achieve this object, engaging a plurality of engaging devices in combined operations allows a plurality of gear positions to be established. A shifting mechanism (vehicular power transmitting apparatus) | 02-12-2009 |
20090118088 | Surrogate Engine Speed Signal for Controlling a Dual Clutch Powershift Transmission - A method for launching a vehicle having an engine shaft, first and second transmission input shafts, first and second input clutches, a coupler, a power path, and an output, the method including engaging the coupler to connect the first input shaft and the first output shaft through the power path, engaging the second input clutch to connect the engine shaft and the second input shaft mutually, using a speed of the second input shaft to determine a desired clutch torque capacity of the first input clutch, and actuating the first input clutch to produce the desired clutch torque capacity of the first input clutch and to complete a drive connection between the first input shaft and the output. | 05-07-2009 |
20090131217 | Method for Determining the Application Point of an Automatically Controlled Friction Clutch - The instant invention relates to a method for determining an application point of an automatically actuated friction clutch of an automatic mechanical transmission for a motor vehicle. According to it, after the pre-selection of a new gear, the clutch automatically separates, the activated gear is disengaged, the engine rotational speed is brought to a target value for the new gear and the clutch with higher advancing speed is advanced to an application point at which the transmission input shaft is precisely entrained. To determine the application point, the gradient of the time curve of the rotational speed of the transmission input shaft is monitored, an important change of the gradient that adjusts itself when reaching the application point is determined and the position of the clutch existing at this moment is defined as application point. The application point is preferably determined during downshifts, the time rotational speed curve of the transmission input shaft has between the slowdown and the re-acceleration a distinct minimum easily and accurately to be determined. | 05-21-2009 |
20090247358 | SHIFT TRANSMISSION CONTROL DEVICE OF VEHICLE, VEHICLE AND METHOD FOR CONTROLLING SHIFT TRANSMISSION IN VEHICLE - A shift transmission control device of a vehicle includes a transmission, a clutch, a shift transmission controller, and a shift inhibition state detector. The shift transmission controller is configured to control the transmission and the clutch. The shift inhibition state detector is configured to detect based on a running state of the vehicle that a predetermined shift inhibition condition is satisfied. The transmission is capable of providing a preliminary change gear ratio while the predetermined change gear ratio at which the rotational drive force is transmitted to the drive wheel is maintained. The shift transmission controller is configured to control the transmission to inhibit a change of the predetermined change gear ratio at which the rotational drive force is transmitted to the drive wheel and to provide the preliminary change gear ratio in response to the running state of the vehicle when the shift inhibition condition is satisfied. | 10-01-2009 |
20090305846 | METHOD FOR CONTROLLING THE DRIVETRAIN OF A MOTOR VEHICLE AND CONTROL UNIT FOR PERFORMING THE METHOD - A method controls a drivetrain of a motor vehicle having an internal combustion engine, an automatic transmission with at least two discrete transmission stages, and a clutch which is controlled automatically. The method is characterized in that when there is a transmission output speed at which the transmission input speed in an n-th transmission stage would be above a minimum rotational speed of the internal combustion engine and a transmission input speed in an (n+1)-th transmission stage would be below the minimum rotational speed, the drivetrain is operated in the (n+1)-th transmission stage with a slipping clutch and a rotational speed of the internal combustion engine which is above the minimum rotational speed. A control unit is configured to carry out such a method. | 12-10-2009 |
20090318262 | VEHICLE CONTROL SYSTEM AND METHOD OF CONTROLLING VEHICLE - A control system of a vehicle including an engine and an automatic transmission operable to form one of a plurality of gear positions set according to running conditions of the vehicle, and a method of controlling the vehicle are provided. In the control, the rotational speed of an input-side rotary shaft of a shifting mechanism of the transmission is detected, and the vehicle is controlled so that, when an execution condition that one of the gear positions set according to the running conditions is maintained and the rotational speed of the input-side rotary shaft has increased to be higher than a rotational speed corresponding to the set gear position is satisfied, the vehicle is brought into running conditions that will eliminate a state in which air is present in the hydraulic fluid supplied from an oil supply device. | 12-24-2009 |
20100048351 | METHOD FOR DYNAMICALLY DETERMINING A CLUTCH REST POINT - A dynamic and event-dependent determination of a rest point of a clutch. The rest point being an actuation path shortly before a slipping region of the clutch in which the clutch still does not transmit an appreciable amount of torque but which allows very rapid attainment of a clutch position in which an appreciable torque can be transmitted. The rest point can be determined by proceeding from a basic test point by allowing for various offset or correction values. A control device determines, at favorable event-dependent times, these correction values depending on specific parameters. Then a clutch actuator is actuated such that the friction clutch is engaged up to this rest point. In this manner, increased wear of the clutch and the shifting time required to achieve the slipping region of the clutch can be minimized depending on the specific parameters. | 02-25-2010 |
20100062898 | DEVICE FOR CONTROLLING A POWER TRANSMISSION DEVICE OF A VEHICLE AT THE TIME OF GEARSHIFT - A device for controlling a power transmission device for a vehicle, which, at the time of gearshift, so controls the engine as to rotate at a target rotational speed, wherein at the time of shifting the gear up, a target value properly corresponding to an actual vehicle speed is set to quickly increase the engine output and to shorten the time for shifting the gear. In controlling the engine at the time of shifting the gear up, a target engine rotational speed is set based the signals from, wheel rotational speed detector means that detects the rotational speed of a wheel, such as an anti-lock control device. Thus, the target engine rotational speed is set depending properly upon an actual vehicle speed that varies accompanying an increase in the amount of engaging the clutch at the time of gearshift, and the gear at the time of accelerating the vehicle can be quickly shifted up without accompanied by the shift shock. At the time of shift-down, a target engine rotational speed is set based on an actual vehicle speed found from the signals of the transmission input shaft rotational speed. | 03-11-2010 |
20100069198 | CONSTRUCTION VEHICLE - A construction vehicle includes a control unit configured to shift gear after performing pre-shifting to couple a target speed-change gear that corresponds to a target speed with a target speed-change shaft in non-transmitting state of rotation of the input shaft when the gear shift is performed from a current speed to the target speed, in a state in which the current speed gear that corresponds to the current speed step and the current speed-change shaft that corresponds to the current speed gear are coupled. When the vehicle speed detected by the vehicle speed detecting section is zero, the control unit is configured to perform pre-shift auxiliary control prior to the pre-shifting control to input the rotation of the input shaft to the target speed-change shaft in a state in which the target speed-change shaft is not coupled to the plurality of speed-change gears. | 03-18-2010 |
20120214642 | MULTI-RATIO ROTORCRAFT DRIVE SYSTEM AND A METHOD OF CHANGING GEAR RATIOS THEREOF - A multi-ratio rotorcraft drive system and a method of changing gear ratios thereof are disclosed. According to one embodiment, the multi-ratio rotorcraft drive system comprises a rotor system comprising one or more rotors and one or more engines. Each engine of the one or more engines is coupled to the rotor system through a multi-ratio transmission. The multi-ratio transmission comprises an output shaft coupled to the rotor system, an input shaft coupled to a respective engine of the one or more engines, a high speed clutch integrated into a high speed gear train, and a low speed clutch integrated into a low speed gear train. The high speed clutch and the low speed clutch are freewheeling clutches without a friction plate and are capable of disconnecting the output shaft and the input shaft in an overrunning condition when the output shaft spins faster than the input shaft. | 08-23-2012 |
20120220423 | METHOD FOR CONTROLLING A DUAL-CLUTCH TRANSMISSION - A method of controlling a dual-clutch transmission in a motor vehicle, including two partial drivetrains, each having a plurality of gears, which each can be connected to a crankshaft of an internal combustion engine by means of a friction clutch, the method having the following steps: the first friction clutch transmits a torque to the first partial drivetrain assigned to it; the second friction clutch transmits at most a negligible torque to the second partial drivetrain; and the two partial drivetrains have a common differential, where when there are changes in torque and the amount of torque to be transmitted is low, and there is downshifting into a gear with a high transmission ratio in the first partial drivetrain, downshifting occurs into a gear with a low transmission ratio in the second partial drivetrain, and preliminary torque is applied to the differential by this gear. | 08-30-2012 |
20120220424 | METHOD FOR CONTROLLING A ROLLING OR COASTING FUNCTION OF A VEHICLE - A method of controlling a rolling or a coasting function of a vehicle, such as a commercial vehicle, having a drive train including a drive motor, an automatic or automated transmission that is controllable by transmission controls, a controllable shifting mechanism for interrupting the flow of power in the drive train, and a driving speed control device. The flow of power in the drive train is interrupted in a suitable driving situation. In order for the rolling or the coasting function to be exploited as efficiently as possible, and still be terminated safely and comfortably, the flow of power in the drive train is restored depending on a selectable difference in speed (Δv_F_T) between the current vehicle speed (v_F) and a speed limit (v_T) set by the driving speed control device. | 08-30-2012 |
20120252630 | GEAR RATIO CONTROL DEVICE, METHOD FOR CONTROLLING GEAR RATIO, AND VEHICLE - A gear ratio control device includes a controller configured to control gear ratio in a vehicle. The controller is configured to adjust an eccentricity of first supporting points of the eccentric discs so that, in the event of starting a power source in a state in which the power source is stopped and the vehicle is traveling, the gear ratio at a continuously variable transmission is at a target value, in parallel with performing start control of the power source. | 10-04-2012 |
20120302399 | CONTROL APPARATUS FOR TWIN-CLUTCH AUTOMATIC TRANSMISSION - When reception of engine rotating speed information from an engine control unit is failed, the control unit puts gear positions belonging to a second gear position group in a non-operable and connected state, and then puts a second clutch into a engaged state to convert a rotating speed of a second input shaft detected by a second rotational sensor into a rotating speed of an engine output shaft. The control unit controls so as to fasten a first clutch based on the converted rotating speed of the engine output shaft, thereby enabling a star of a vehicle. | 11-29-2012 |
20130045836 | CONTROL UNIT AND METHOD TO OPERATE A VEHICLE - A control unit of a motor vehicle for activating a form-locking shift element of a transmission of the motor vehicle in such a way that a defined rotational speed difference is defined, between an input-side component of the form-locking shift element and an output-side component of the form-locking shift element, in order to engage the form-locking shift element. The control unit monitors the rotational speed gradient of the rotational speed of the output-side component of the form-locking shift element from an activation time of the form-locking shift element, at which the engagement process of the form-locking shift element begins. The control unit generates a control signal for a drive assembly in order to increase the torque, at a drive assembly, in the event that the control unit determines that the monitored rotational speed gradient falls below a lower limit. | 02-21-2013 |
20130116088 | METHOD FOR STARTING AN ENGINE - A method for improving starting of an engine that may be repeatedly stopped and started is presented. In one example, the method adjusts a desired engine speed to at least two levels during engine speed run-up from cranking to engine idle speed. The method may improve vehicle launch for stop/start vehicles. | 05-09-2013 |
20130150209 | Method for Diagnosing and Controlling an Unusual Hydraulic State of Hybrid Vehicle Transmission - A system and method for diagnosing and controlling an unusual hydraulic state of an electric variable transmission of a hybrid vehicle achieving multi modes including a first mode and a second mode, the method may include determining whether the first mode is converted into the second mode, determining whether a hydraulic pressure is generated in a clutch which is engaged and the generated hydraulic pressure is higher than a predetermined hydraulic pressure when the first mode is converted into the second mode, and determining that the hybrid vehicle is in an unusual condition if the hydraulic pressure is not generated in the clutch or the generated hydraulic pressure is higher than the predetermined hydraulic pressure. | 06-13-2013 |
20140121059 | Clutch Torque Trajectory Correction To Provide Torque Hole Filling During A Ratio Upshift - A multiple ratio transmission having an input shaft, an output shaft and oncoming clutch and off-going clutch for effecting ratio upshifts is provided. The transmission also includes a transmission controller configured for controlling shifts. During the torque phase of a ratio upshift, the controller increases input torque. Next, the controller estimates an oncoming clutch target torque. The controller controls a torque input to ensure the off-going clutch remains locked. The controller measures an actual transmission value for a torque transmitting element of the transmission and corrects the oncoming clutch target torque using the actual transmission value whereby an increasing torque for the oncoming friction element is achieved with minimal torque transients along the output shaft during the upshift. | 05-01-2014 |
20150080178 | Energy Capture Mechanism for Electric Drive Machines - The present disclosure relates generally to an energy capture for an electric drive machine, and more particularly to systems and methods for capturing energy during braking of the electric drive machine. In some examples, the disclosure describes an energy capture device including at least two planetary gear assemblies. The first planetary gear assembly can be operatively coupled to an engine, and can engage and disengage, via a first overrunning clutch, a shaft coupled to a generator. The second planetary gear assembly can be at least partially fixed to the first planetary gear assembly, and can engage and disengage, via a second overrunning clutch, the shaft. The first overrunning clutch can disengage the shaft and the second overrunning clutch can engage the shaft during a braking period. | 03-19-2015 |
20150105217 | DCT CONTROL METHOD IN CASE OF FAILURE OF WHEEL SPEED SENSOR - A dual clutch transmission (DCT) control method for a vehicle mounted with a DCT, which is not provided with an output shaft speed sensor, when a wheel speed sensor has failed, or the information cannot be controlled in a situation where shift gears are not coupled, properly couples the shift gears while preventing a clutch burst, and thus a controller can control DCT by calculating an output shaft speed of DCT. | 04-16-2015 |