Patent application number | Description | Published |
20090210122 | ACCELERATOR PEDAL PREDICTIVE SHIFT POINT CONTROL - A transmission control module for a vehicle transmission includes a gear determination module, a predictive shift module, and a validation module. The gear determination module commands a first shift configuration based on an actual pedal position. The predictive shift module calculates a predicted pedal position based on the actual pedal position and commands a second shift configuration based on the predicted pedal position. The validation module validates the predicted pedal position and selectively cancels the second shift configuration based on the validation. | 08-20-2009 |
20110166757 | CLOSED-LOOP FEEDBACK CONTROL AND REDUCTION OF THE TORQUE CONVERTER CLUTCH SLIP FOR ENHANCED DRIVABILITY FOR HEAVY TIP-IN MANEUVERS - A method for responding to a rapid change in engine torque includes monitoring a change in engine torque and determining a rapid change in engine torque when the change in engine torque exceeds a threshold change in engine torque. Subsequent to determining a rapid change in engine torque, an increase in the torque converter slip is provided by reducing the torque converter clutch pressure command by a selected value and thereafter the feedback control is deactivated for a predetermined duration. Subsequent to the predetermined duration, the feedback control is reactivated to decrease the torque converter slip toward a desired torque converter slip value. | 07-07-2011 |
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 |
20110257857 | CONTROL SYSTEM AND METHOD FOR SYNCHRONIZATION CONTROL 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 slip sensing module estimates slip acceleration between an input shaft and a gear. A flow determining module generates a flow command for the flow control solenoid. A sync control module determines a slip acceleration profile including an estimated slip acceleration, adjusts the estimated slip acceleration based on the measured slip acceleration, and generates a pressure command for the pressure control solenoid based on the adjusted slip acceleration. | 10-20-2011 |
20110263383 | SHIFT SEQUENCING SYSTEMS FOR A DUAL CLUTCH TRANSMISSION - A dual-clutch transmission (DCT) shift sequencing system includes a shift type module that determines a shift type based on a scheduled gear and a current attained gear of a DCT. A shift sequence module determines a sequence index based on the shift type. A sequencing module generates a fork command signal and a clutch command signal based on a first sequencing table corresponding to the sequence index. A shift abort module may be included to terminate an ongoing shift and to transition to an updated shift. A fork control module controls fork shifting in the DCT based on the fork command signal. A clutch control module controls clutch engagement in the DCT based on the clutch command signal. | 10-27-2011 |
20110288841 | VEHICLE SIMULATION SYSTEM WITH SOFTWARE-IN-THE-LOOP BYPASS CONTROL - A vehicle simulation system includes a first simulation model that when executed simulates a software ring along with other software of a vehicle module. The vehicle simulation system further includes a second simulation model of the software ring. A bypass switch that has a first state and a second state. A bypass switching module switches the bypass switch between the first simulation model and the second simulation model based on a bypass signal and a ring enabling signal. A simulation control module executes code of a vehicle simulation model including software in-the-loop (SIL) testing of a selected one of the first simulation model and the second simulation model based on state of the bypass switch. | 11-24-2011 |
20110313629 | SYSTEM AND METHOD FOR DETERMINING VEHICLE SPEED - A system for a vehicle includes a speed determination module, a buffer module, and a speed prediction module. The speed determination module determines changes in measured vehicle speed. The buffer module stores the determined changes in measured vehicle speed. The speed prediction module predicts a speed of the vehicle when the measured vehicle speed is less than a predetermined threshold, wherein the predicted vehicle speed is based on an average of the stored changes in measured vehicle speed. | 12-22-2011 |
20120029777 | GEAR PRESELECT SYSTEMS FOR A DUAL CLUTCH TRANSMISSION - A dual-clutch transmission (DCT) system includes a vehicle speed offset module that generates a vehicle speed offset signal based on a preselect time and a vehicle acceleration signal. A compensated vehicle speed module generates a compensated vehicle speed based on the vehicle speed offset signal and a vehicle speed. A preselect command module generates a predicted gear signal based on a comparison between the compensated vehicle speed and a shift point from a shift pattern module. The predicted gear signal, identifies a first predicted gear of a DCT. The preselect time is defined as at least an amount of time to disengage a second predicted gear and preengage the first predicted gear. | 02-02-2012 |
20120296536 | ENGINE SPEED ASSIST TORQUE CONVERTER CLUTCH CONTROL - A method for controlling actuation of a torque converter clutch includes monitoring a transmission input speed, comparing the monitored transmission input speed to a threshold input speed, and, when the transmission input speed is less than the threshold input speed, controlling an engine speed based upon a desired minimum engine speed. Controlling the engine speed based upon the desired minimum engine speed includes monitoring a minimum engine speed critical parameter, determining the desired minimum engine speed based upon the minimum engine speed critical parameter, comparing the engine speed to the desired minimum engine speed, and controlling actuation of the clutch device based upon a result of the comparing the engine speed to the desired minimum engine speed. | 11-22-2012 |
20130240315 | DUAL-CLUTCH TRANSMISSION THERMAL MANAGEMENT - A method of cooling a multi-speed dual-clutch transmission (DCT) that is paired with an internal combustion engine in a vehicle includes detecting operation of the vehicle. The method also includes sensing an increase in temperature of a subsystem of the DCT while the vehicle is operating. The method also includes selecting a remedial action in response to the sensed temperature. The method aditionally includes activating the selected remedial action such that the temperature of the subsystem is reduced. | 09-19-2013 |
20130282243 | DUAL-CLUTCH TRANSMISSION THERMAL MANAGEMENT - A method of controlling thermal loading in a multi-speed dual-clutch transmission (DCT) that is paired with an internal combustion engine in a vehicle is provided. The method includes detecting operation of the vehicle and ascertaining a degree of thermal loading on the DCT. The method also includes selecting a remedial action corresponding to the ascertained degree of thermal loading. Additionally, the method includes activating the selected remedial action such that the thermal loading on the DCT is reduced. A vehicle having a DCT, an internal combustion engine, and a controller configured to control thermal loading in the DCT is also disclosed. | 10-24-2013 |
20140358383 | METHOD OF IDENTIFYING A SYNCHRONOUS POSITION OF A SYNCHRONIZER ACTUATOR FORK OF A DUAL CLUTCH TRANSMISSION - A method of identifying a synchronous position of a synchronizer actuator fork includes sensing a deceleration rate of a first shaft, when a synchronizer is positioned in a neutral position, to define a first rate of deceleration. The synchronizer is moved along the first shaft from the neutral position toward a gear with a synchronizer actuator fork. A deceleration rate of the first shaft is sensed, while the synchronizer actuator fork moves the synchronizer along the first shaft, to identify a change from the first rate of deceleration to a second rate of deceleration. The location, of the synchronizer actuator fork relative to the first shaft, at which the rate of acceleration of the first shaft changes from the first rate of deceleration to the second rate of deceleration, is identified as the synchronous position of the synchronizer actuator fork. | 12-04-2014 |
20150051803 | METHOD OF LEARNING A CLUTCH KISS POINT FOR A CLUTCH OF A DUAL CLUTCH TRANSMISSION - A method of learning a kiss point of a first clutch of a dual clutch transmission includes controlling a rotational speed of the input shaft to be within a pre-determined range. When both the first clutch and the second clutch are determined to be disengaged from the input shaft, and the rotational speed of the input shaft is within the pre-determined range, then the first clutch is moved from a disengaged position into an engaged position. An increase in a rotational speed of a first transmission shaft, which is coupled to the first clutch, is detected. When the increase in the rotational speed of the first transmission shaft is detected, a position of the first clutch is identified. The identified position of the first clutch is saved in a memory of a transmission control module as a learned first clutch kiss point. | 02-19-2015 |