Patent application number | Description | Published |
20100018829 | TORQUE TRANSMITTING DEVICE ACTUATION SYSTEM USING A PIEZOELECTRIC PUMP - A hydraulic control system for actuating a torque transmitting device in a transmission includes a sump for receiving a hydraulic fluid and a piezoelectric pump for pumping the hydraulic fluid from the sump to the torque transmitting device. A first fluid flow path communicates the hydraulic fluid from the sump to the piezoelectric pump and a second fluid flow path communicates the hydraulic fluid from the piezoelectric pump to the torque transmitting device. An exhaust means selectively communicates the hydraulic fluid from the torque transmitting device to the sump. | 01-28-2010 |
20100071357 | AUXILIARY PUMP SYSTEM FOR HYBRID POWERTRAINS - An auxiliary pump system for a hybrid powertrain includes a hydraulic accumulator, a hydraulic transformer, a plurality of control devices, a sump, and a plurality of fluid flow paths. The accumulator is charged by a high flow, high pressure hydraulic fluid by opening a first of the control devices and closing a second of the control devices. The accumulator is discharged by closing the first of the control devices and opening the second of the control devices. A high pressure, low flow hydraulic fluid is communicated from the accumulator to the hydraulic transformer. The hydraulic transformer converts the high pressure, low flow hydraulic fluid into a high flow, low pressure hydraulic fluid that is employed by systems within the hybrid powertrain. | 03-25-2010 |
20100087999 | Apparatus and Method for Detecting End-of-Fill at Clutch in Automatic Transmission - An improved method and apparatus for detecting end-of-fill at a hydraulic clutch in an automatic transmission with a variable force solenoid are provided. The method includes: initiating clutch fill mode by commanding a high current to the solenoid whereby a high fluid pressure is delivered to the clutch apply volume; monitoring clutch fill time; determining if the fill time is greater than a threshold fill time; monitoring the current (e.g., actual and filtered) being actively drawn by the solenoid during clutch fill mode in response to the fill time being greater than the threshold fill time; detecting if an aberration occurs in the current; and stopping distribution of fluid to the hydraulic clutch in response to the current aberration. Detecting if an aberration occurs preferably includes determining a change in instantaneous armature velocity, and determining if the change in instantaneous velocity is greater than a threshold change in armature velocity. | 04-08-2010 |
20100304927 | DUAL GAIN CLUTCH CONTROL SYSTEM - An automatic transmission includes a control system for controlling a clutch of the transmission. The control system includes a first variable flow solenoid and a second variable flow solenoid, each in selective fluid communication with the clutch. The first variable force solenoid provides hydraulic fluid within a first pressure range of 0 and 1,000 kPa. The second variable force solenoid provides hydraulic fluid within a second pressure range of 0 and 2,000 kPa. A transmission controller sends an electrical signal having a current between the range of 0 and 1 amp to one of the first and second variable flow solenoids. The pressure output of each of the first and second variable force solenoids is a function of, within their respective first and second pressure ranges, the amplitude of the current of the electrical signal to provide two distinct power gains to the single clutch. | 12-02-2010 |
20100326542 | CONTROL SYSTEM FOR AN AUTOMATIC TRANSMISSION HAVING MULTIPLE DEFAULT MODES - A hydraulic control system for a automatic transmission includes a plurality of solenoids and valves in fluid communication with a plurality of shift actuators. The shift actuators are operable to actuate a plurality of torque transmitting devices. Selective activation of combinations of the solenoids allows for a pressurized fluid to activate at least one of the shift actuators. The solenoids are configured to provide a forward gear ratio and a reverse gear ratio when the solenoids are deengerized. | 12-30-2010 |
20110093172 | GEAR ACTUATOR CONTROL SYSTEMS AND METHODS FOR DUAL CLUTCH TRANSMISSIONS - A control system for a dual clutch transmission (DCT) of a vehicle comprises a difference module, a summer module, and a position control module. The difference module determines a difference between a desired position for a gear actuator and a measurement of a current position of the gear actuator. The summer module determines a sum of a derivative of the difference and a product of the difference and a predetermined gain. The position control module controls the current position of the gear actuator based on the sum. The current position of the gear actuator controls a position of a gear synchronizer that slides along an output shaft of the DCT. The position of the gear synchronizer controls coupling of a gear ratio with the output shaft. | 04-21-2011 |
20110100144 | BARREL CAM SHIFT MECHANISM - A shift mechanism for a dual clutch transmission employs a rotating barrel cam having at least three tracks which are engaged by and translate at least three associated cam followers. The cam followers extend from shift fork bodies which slide on rails and include shift forks which bi-directionally translate at least three synchronizer clutches which engage at least five forward gears or speeds and reverse. A single electric motor and gear train drive the barrel cam. | 05-05-2011 |
20110107864 | ELECTROMAGNETIC SYNCHRONIZER ACTUATING SYSTEM - An assembly for actuating a synchronizer includes a shift fork, a shift rail, and a permanent magnet connected to the shift rail. A first control coil is disposed in proximity to the permanent magnet. The first control coil is operable to produce a magnetomotive force on the permanent magnet in a first direction when a current is applied to the first control coil. A second control coil is disposed in proximity to the permanent magnet. The second control coil is operable to produce a magnetomotive force on the permanent magnet in a second direction when a current is applied to the second control coil. The permanent magnet is moved to a first position when the current is applied to the first control coil and the permanent magnet is moved to a second position when the current is applied to the second control coil. Movement of the magnet in turn moves the synchronizer between engaged positions. | 05-12-2011 |
20110112737 | METHOD OF DETECTING FILLING OF HYDRAULIC CLUTCH - A method of detecting substantial filling of a hydraulic cylinder of a hydraulically operated clutch of a vehicular transmission is disclosed and claimed. A pressure sensor disposed in a hydraulic line to the clutch cylinder provides a signal that the hydraulic pressure has dropped as the clutch cylinder begins to fill and also that the pressure has returned to a substantially normal level. The pressure sensor may be a continuously variable output such as an analog sensor, pulse width modulation (PWM) sensor, a similar device or, less desirably, a two state sensor. An iterative algorithm utilizes data from the sensor and a timer to determine when clutch fill is substantially complete. | 05-12-2011 |
20110180358 | VIBRATION ABSORBER - A system for absorbing vibration in a rotary member having a predetermined rotary speed of the present invention has a selectively moveable mass and a positioning mechanism. The mass is in communication with the rotary member having a predetermined position. The positioning mechanism exerts a force on the mass at least when the rotary member operates below the predetermined rotary speed. The force exerted by the positioning mechanism orients the mass at the predetermined position when the rotary member operates below the predetermined rotary speed. | 07-28-2011 |
20110186395 | CENTRIFUGAL PENDULUM VIBRATION ABSORBER - A centrifugal pendulum vibration absorber (CPVA) for absorbing torsional vibration created by operation of an engine includes a plurality of pendulums moveable with respect to a rotatable shaft. The pendulums are connected to the rotatable shaft by a plurality of pins that extend through apertures in the pendulum. The pendulums each move along a path defined by various drive line or powertrain parameters and characteristics. The path is implemented by contouring an active section of the apertures that engage the pins. | 08-04-2011 |
20110186399 | LEVER APPLIED DRY CLUTCH - A dual clutch assembly includes a housing, an actuation member rotationally coupled with the housing, a first member coaxial with the housing, and a second member coaxial with the first member. A first clutch includes a first plate connected with the actuation member and a second plate connected for common rotation with the first member. A second clutch includes a first plate connected with the housing and a second plate connected for common rotation with the second member. At least one first lever is pivotally coupled to the housing. The first lever is pivotable to contact the actuation member thereby translating the actuation member and the first plate towards the second plate in order to engage the first clutch. The second lever is pivotable to contact the first plate of the second clutch and translate the first plate towards the second plate in order to engage the second clutch. | 08-04-2011 |
20110195794 | VIBRATION ABSORBER - A system for absorbing vibration created by operation of an engine of the present invention includes a first plate driven by an engine shaft and a torque transmitting device for transferring torque from the engine shaft to a transmission input shaft. The system includes a first vibration absorber and a second vibration absorber. The first vibration absorber includes at least one selectively moveable mass. The second vibration absorber includes at least one biasing member and generally opposing ends. The first vibration absorber is configured to absorb vibrations created at a first harmonic of the engine and the second vibration absorber is configured to absorb vibrations created at multiple harmonics of the engine. | 08-11-2011 |
20110203401 | MULTIPLEXED ELECTROMECHANICAL ACTUATOR MECHANISM - A multiplexed electromechanical shift mechanism includes a single linear actuator with multiple independently selectable linkages actuating a clutch and multiple gears for use in motor vehicle transmissions such as a dual clutch transmission. The linear actuator may be a ball screw, a planetary roller screw or hydraulic or pneumatic operator capable of controlling bi-directional linear motion of an output member. A plurality of linear clutches selectively couple the output member to one of a plurality of linkages adapted to transfer the bi-directional motion of the output member. One of the linkages is coupled to and engages an input (main) clutch of the transmission and the remaining linkages are coupled to and bi-directionally translate shift forks and synchronizer clutches which achieve gear selection and engagement. | 08-25-2011 |
20110208396 | REALTIME ESTIMATION OF CLUTCH PISTON POSITION - The present invention provides an apparatus and method for estimating the realtime position of a clutch piston during the fill cycle using noisy pressure measurements which ensures proper and desired clutch operation. Pressures on both sides of a flow controlling orifice, at the fluid control actuator and the clutch cylinder are measured and these measurements in conjunction with other system parameters such as orifice size, clutch volume and return spring characteristics are used to solve nonlinear dynamic equations (algorithms) which reside in a microprocessor. The microprocessor provides outputs corresponding to an estimate of the current position of the clutch piston, an estimate of the current speed of the piston and an estimate of the current hydraulic pressure. The method can also be utilized to detect clutch wear. | 08-25-2011 |
20110303033 | GEAR SELECTOR APPARATUS AND CONTROL FOR A VEHICLE TRANSMISSION - A gear selector apparatus for a transmission having a first gear and a second gear selectively engageable to a shaft through a synchronizer. The gear selector apparatus includes a hydraulic actuator, a gear selection fork engaged with the actuator, a guide bar fixed for common movement to the gear selection fork, a detent mechanism disposed in contact with a first edge of the guide bar, a position sensor disposed in contact with a second edge of the guide bar, a first and a second pressure control valve in communication with the hydraulic actuator, a controller in electrical communication with the position sensor and the first and second pressure control valve. The controller includes a control logic sequence. | 12-15-2011 |
20110303049 | ELECTRO-HYDRAULIC AND ELECTRO-MECHANICAL CONTROL SYSTEM FOR A DUAL CLUTCH TRANSMISSION - A control system for controlling a dual clutch transmission having a synchronizer assembly includes a motor for selectively providing an output torque in a first and second to both of a first and a second output member. A one-way device is interconnected to the first output member and is operable to transmit the output torque in the first rotational direction. A pump is connected to the one-way device. A disconnect device is interconnected to the second output member. The torque disconnect device is operable to decouple the motor from a cam or a torque multiplication device. The cam includes at least one groove having a configuration corresponding to synchronizer assembly positions. A shift fork is disposed in the groove and is operable to translate the synchronizer assembly. Rotation of the cam translates the shift fork and the synchronizer assembly between at least a neutral position and an engaged position. | 12-15-2011 |
20120017716 | SYNCHRONIZER ACTUATION ASSEMBLY - A synchronizer actuation assembly for actuating at least one synchronizer member includes a barrel cam, at least one shift fork, a hydraulic piston assembly, and a motion converter. The barrel cam includes at least one cam groove that circumscribes the barrel cam and defines at least a neutral position and a first engaged position. The at least one shift fork has a first end portion disposed in the at least one cam groove and a second forked end portion. The hydraulic piston assembly includes a housing and a piston disposed in the housing. The motion converter includes a translatable input member engaged with the piston of the hydraulic piston assembly, a rotatable output member rotatably coupled with the barrel cam, and a direction selection mechanism. The translatable input member is selectively rotatably coupled with the rotatable output member in a first rotational direction or a second rotational direction. | 01-26-2012 |
20120022718 | METHOD OF CONTROLLING START/STOP OF A VEHICLE AT A TRAFFIC LIGHT - A method of controlling a vehicle stopped at a stop cycle of a traffic light includes broadcasting a signal indicating the time remaining in the stop cycle, and engaging a vehicle drive component, such as and engine of the vehicle and/or an auxiliary pump of the vehicle, prior to the end of the stop cycle when the time remaining in the stop cycle is less than a pre-determined time period. | 01-26-2012 |
20120144945 | SINGLE-PISTON THREE-POSITION HYDRAULIC ACTUATOR - An actuator assembly includes a housing, a piston disposed within a portion of the housing. The piston has a movable range along a working-axis, and separates a first volume and a second volume within the housing. The assembly also includes a biasing feature disposed within the second volume, where the piston is configured to engage the biasing feature within a first portion of the movable range, and configured to not engage the biasing feature within a second portion of the movable range. | 06-14-2012 |
20120193188 | ENGINE START STOP APPLICATIONS FOR SOLENOID PUMPS - A solenoid pump and associated hydraulic circuitry are intended for use in automatic transmissions capable of engine start stop (ESS) operation. In a first embodiment, a solenoid pump provides pressurized hydraulic fluid to respective inputs of two way check valves. The other inputs are provided with controlled hydraulic fluid from a transmission valve body. The outputs of the check valves are provided to those hydraulically operated torque transmitting devices associated with first gear. The solenoid pump is activated when the transmission is in gear and the engine is stopped to maintain hydraulic pressure in those actuators associated with first gear in order that a first gear vehicle launch may be quickly and smoothly achieved when the engine is restarted. A second, similar embodiment provides hydraulic fluid to actuators associated with reverse gear. A third embodiment includes a solenoid pump and a latching solenoid valve both communicating with a hydraulic supply between a variable output solenoid valve and a hydraulic actuator in an automatic transmission which maintains clutch pressure by compensating for leaks in the hydraulic components. In a fourth embodiment, a solenoid pump provides pressurized hydraulic fluid to the exhaust backfill circuits of one or more hydraulic operators in an automatic transmission. | 08-02-2012 |
20120251359 | LOW NOISE HIGH EFFICIENCY SOLENOID PUMP - A low noise, high efficiency solenoid pump includes a housing containing a hollow electromagnetic coil. Within the coil resides a pump assembly defining a tubular body having a pair of opposed ends which respectively include an inlet or suction port and an outlet or pressure port and within which a plunger or piston resides. The piston is biased in opposite directions by a pair of opposed compression springs. A first compression spring limits and arrests travel of the piston during the suction or return stroke and a second compression spring limits travel of the piston during the pumping stroke and returns the piston after the pumping stroke. The piston includes a first check valve that opens to allow hydraulic fluid into a pumping chamber during the suction stroke and closes during the pumping stroke to cause fluid to be pumped out of the pumping chamber. A second check valve opens to allow pumped fluid to exit the pumping chamber and the pump body through the outlet or pressure port and closes to inhibit reverse flow. | 10-04-2012 |
20120277964 | DIRECT CLUTCH CONTROL FOR DUAL CLUTCH TRANSMISSIONS - A control system for controlling clutches of a dual clutch transmission includes an internal model based force control algorithm that converts a desired clutch force to a pressure control signal, a pressure control valve that receives the pressure control signal, a hydraulic actuator to which the pressure control valve applies a pressure related to the pressure control signal, and a clutch assembly with a spring lever and a plurality of clutch plates. The hydraulic actuator applies a desired force corresponding to the pressure control signal to a distal end of the spring lever such that the desired force to the distal end of the spring lever imparts an actual clutch force to the clutch plates. | 11-01-2012 |
20130015254 | TEMPERATURE DEPENDENT VARIABLE FLOW ORIFICE - A variable flow orifice for a hydraulic control system in a transmission includes a shape memory alloy that selectively increases and decreases the size of an orifice. The deformation of the shape memory alloy, and therefore the size of the orifice, is a function of the temperature of the transmission. During cold conditions the orifice size is increased and during normal operating conditions the size of the orifice is decreased. | 01-17-2013 |
20130035839 | ENGINE START STOP INHIBIT SYSTEM AND METHOD - A system includes a first module configured to determine at least one of a position of a vehicle, an elevation level of the vehicle and a road grade at the position of the vehicle. A second module configured to inhibit an autostop of an engine including generating a start-stop signal based on the at least one of the position of the vehicle, the elevation level of the vehicle and the road grade at the position of the vehicle. An actuator control module configured to prevent the autostop by adjusting at least one of a spark parameter, a fuel parameter and an air flow parameter of the engine based on the start-stop signal. | 02-07-2013 |
20130042927 | VALVE CONFIGURED FOR REGULATING THE FLOW OF FLUID FROM A TRANSMISSION TO A FLUID COOLER - A transmission fluid circuit includes a transmission, a cooler, and a valve. The transmission receives and expels a fluid. The cooler receives and expels the fluid to the transmission. The valve directs the flow of fluid received from the transmission to one of the transmission and the fluid cooler. The valve includes a housing, a spool and an actuator. The housing defines a cavity. The spool is movable longitudinally in the cavity between a first position and a second position to direct the flow of the fluid from the cavity to the cooler or the transmission. The actuator is operatively connected to the spool and includes a smart material which is activated in response to the temperature of the fluid in the cavity having at least a first temperature and deactivated in response to the fluid in the cavity having a sufficient number of degrees less than the first temperature. | 02-21-2013 |
20130113407 | CONTROL SYSTEM WITH REMOTE DRIVERS - A control system for a transmission includes a transmission control module having a processor configured to determine an output torque command and having a pulse width modulation (PWM) switch configured to generate a PWM signal at least partially representative of the output torque command. A network is in communication with the transmission control module and is configured to receive and transmit the PWM signal. A driver is integrated with the electromagnetic actuator and is in communication with the network. The driver is configured to receive the PWM signal and convert the PWM signal into a drive current that enables the electromagnetic actuator to fulfill the output torque command. | 05-09-2013 |
20130138306 | TORQUE TRANSFER MECHANISM AND METHOD FOR CONTROLLING IN A VEHICLE LAUNCH OPERATION - A powertrain for a vehicle is provided having an engine, a transmission, a torque transfer mechanism, a hydraulic fluid circuit, and a transmission control module. The torque transfer mechanism includes a hydraulic fluid pump and is drivingly connected to an output member of the engine and an output member of the torque transfer mechanism is drivingly connected to the input member of the transmission. The hydraulic fluid circuit has a hydraulic valve in communication with the first fluid port of the hydraulic fluid pump. The transmission control module include a control logic for operating the powertrain during a vehicle launch event. | 05-30-2013 |
20130139906 | VALVE CONFIGURED FOR REGULATING THE FLOW OF FLUID FROM A TRANSMISSION TO A COOLER - A transmission fluid circuit includes a transmission, a cooler, and a valve. The valve includes a housing, a spool and an actuator. The spool is movable inside the housing between a first position and a second position. The actuator includes a smart material configured to be activated in response to the temperature of the fluid exhibiting at least a first temperature such that the actuator is in a first state. The smart material is configured to be deactivated in response to the fluid being a sufficient number of degrees less than the first temperature such that the actuator is in a second state. The fluid flows from the housing to the transmission and from the transmission the cavity when the spool is in the first position. The fluid flows from the housing to the cooler and from the cooler to the transmission when the spool is in the second position. | 06-06-2013 |
20130145756 | SYSTEM AND METHOD FOR DETERMINING ACCUMULATOR FILL - A method for determining whether an accumulator is filled to a predetermined level with a hydraulic fluid includes commanding a current to a solenoid, providing pressurized hydraulic fluid to the accumulator, setting a timer to an initial value, incrementing the timer, determining if the timer is greater than a timer threshold value, measuring a current to the solenoid if the timer is greater than the timer threshold value, calculating a modified current as a function of the measured current, the timer value, and the commanded current, comparing the modified current to a threshold, and determining that the accumulator is filled to the predetermined level if the modified current is greater than the threshold. | 06-13-2013 |
20130160445 | SHAPE MEMORY ALLOY ACTUATOR - A device or actuator includes a first component made of Shape Memory Alloy (SMA) that applies force to a second component of the device to provide a controllable actuator. The SMA component is selectively energized by using active electric current through it. | 06-27-2013 |
20130197715 | CONTROLLING OPERATION OF A VEHICLE BASED ON PARAMETERS LEARNED DURING DRIVER'S OPERATION OF ANOTHER VEHICLE - A system of a first vehicle includes a communication module, a translation module, a driver identification module, and an actuator control module. The communication module receives first vehicle control data generated based on operation of a second vehicle by a driver. The first and second vehicles are different. The translation module determines second vehicle control data based on the first vehicle control data and first characteristics of the first vehicle. The driver identification module selectively indicates when the driver is operating the first vehicle. During operation of the first vehicle by the driver, the actuator module controls at least one actuator of the first vehicle based on the second vehicle control data. | 08-01-2013 |
20130228041 | VIBRATION ABSORBER - A system for absorbing vibration in a rotary member having a predetermined rotary speed of the present invention has a selectively moveable mass and a positioning mechanism. The mass is in communication with the rotary member having a predetermined position. The positioning mechanism exerts a force on the mass at least when the rotary member operates below the predetermined rotary speed. The force exerted by the positioning mechanism orients the mass at the predetermined position when the rotary member operates below the predetermined rotary speed. | 09-05-2013 |
20130237329 | VIBRATION ABSORBER - A system for absorbing vibration created by operation of an engine of the present invention includes a first plate driven by an engine shaft and a torque transmitting device for transferring torque from the engine shaft to a transmission input shaft. The system includes a first vibration absorber and a second vibration absorber. The first vibration absorber includes at least one selectively moveable mass. The second vibration absorber includes at least one biasing member and generally opposing ends. The first vibration absorber is configured to absorb vibrations created at a first harmonic of the engine and the second vibration absorber is configured to absorb vibrations created at multiple harmonics of the engine. | 09-12-2013 |
20130263683 | ROLLING AND REGULAR GARAGE SHIFTS IN NEW REAR WHEEL DRIVE POWERFLOWS - A system for controlling a transmission of a vehicle includes an engine control module that generates a command, while the vehicle is rolling in either a forward or reverse direction, to change a transmission of the vehicle from a reverse drive gear to a forward drive gear. The transmission includes a first clutch, a second clutch, a third clutch, and a fourth clutch. A transmission control module, in response to the command, maintains a first clutch in an engaged state, releases a second clutch and a fourth clutch, with the first clutch in the engaged state and the second clutch and the fourth clutch released, applies a third clutch with a synchronizer to engage the third clutch, and, after the third clutch is engaged, reapplies the fourth clutch to engage the fourth clutch. | 10-10-2013 |
20130281246 | METHOD FOR REGULATING GARAGE SHIFTS - A method is provided for shifting a transmission having an input member, an output member, at least four planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. At least one of the torque transmitting devices is a dog clutch or a band clutch. The method includes applying a torque transmitting mechanism to interconnect a first member of a planetary gear set with another member of a planetary gear set or a stationary member. The method also includes applying the dog clutch or band clutch to interconnect a second member of a planetary gear set with another member of a planetary gear set or the stationary member, after the first torque transmitting mechanism is applied. After the dog or band clutch is applied, the torque transmitting mechanism is released. | 10-24-2013 |
20130324355 | CONTAINMENT CONTROL FOR A CONTINUOUSLY VARIABLE TRANSMISSION - A speed ratio containment process limits the speed ratio of a variator for a CVT for a motor vehicle when rolling backward by commanding a speed ratio that is higher than the actual speed ratio in an overdrive direction. Accordingly, the actual speed ratio moves to a lowest limit, which provides maximum torque when a driver of the motor vehicle steps on the accelerator pedal to resume forward motion of the motor vehicle. | 12-05-2013 |
20130337963 | AUTOMATIC TRANSMISSION GEAR AND CLUTCH ARRANGEMENT - A transmission is provided having an input member, an output member, four planetary gear sets, a four coupling members and a six torque-transmitting mechanisms. Further, a hydraulic fluid control circuit is provided for controlling the operation of the plurality of torque-transmitting devices. The hydraulic fluid control circuit receives pressurized hydraulic fluid from an off-axis hydraulic fluid pump and has a plurality of fluid passages disposed in the transmission house, input member and other coupling members. | 12-19-2013 |
20140121914 | ACCELERATION-BASED STATE CONTROL OF A BINARY CLUTCH ASSEMBLY - A vehicle includes an engine and transmission having gear sets, an input member that is continuously connected to the engine and a gear set, a binary clutch assembly, a speed sensor, and a controller. The binary clutch assembly includes a freewheeling element holding torque in one rotational direction, and also a selectable one-way clutch (SOWC) portion holding torque in two rotational directions when applied. The controller executes a method to transmit a first binary clutch command to the binary clutch assembly and thus apply the SOWC portion at vehicle launch, and calculates, via the processor, an acceleration value of the vehicle using the measured speed. The controller also selects a shift apply point of the binary clutch assembly as a function of the calculated acceleration value, and transmits a second binary clutch command to the binary clutch assembly to release the SOWC portion at the selected shift apply point. | 05-01-2014 |
20140277977 | SYSTEM AND METHOD OF EXECUTING A DOUBLE TRANSITION SHIFT IN A TRANSMISSION WITH TRANSITIONING CLUTCH HAVING OPPOSITE CLUTCH SLIP AND TORQUE CARRYING DIRECTIONS - A method of executing a double transition shift in a transmission includes determining via a controller that one of four clutches involved in the shift has a clutch slip direction relative to input member rotation direction in one of the current gear and the commanded gear and an opposite clutch torque direction relative to input member torque direction in the other of the current gear and the commanded gear. The controller then calculates clutch torques for at least some of the offgoing clutches and at least some of the oncoming clutches, and controls torque at the offgoing clutches and the oncoming clutches during the shift according to the calculated clutch torques to ensure that the clutch with the opposite slip and torque directions does not provide reaction torque during the shift unless clutch slip across said one of the four clutches is zero or in the clutch torque direction. | 09-18-2014 |