System and method for controlling a dry dual clutch transmission of a vehicle
AssigneeGM Global Technology Operations LLC
InventorsCraig J. Hawkins, Colin Hultengren
Life of this patent
Estimating the term…
Abstract
A system and method can control the dry dual clutch transmission (dDCT) of a vehicle. The method includes modifying a recorded torque-to-position (TTP) table based on a calculated clutch torque difference between a calculated clutch torque and a commanded clutch torque. The commanded clutch torque is provided by a transmission control module and is defined as a clutch torque sufficient to move the vehicle without applying the accelerator applier after the brake applier has been released. The calculated clutch torque is a function of the actual engine torque value, the engine inertia, and the engine acceleration.
Claims20
A method for controlling a dry dual clutch transmission (dDCT) of a vehicle, the vehicle including an acceleratable engine configured to provide torque and inertia, and an engine control module (ECM), an applyable and releasable brake applier, an accelerator applier, the dDCT, and a transmission control module (TCM) in communication with the dDCT and the ECM, the dDCT having first and second input clutches and first and second gear sets selectively connected to the engine via the respective first and second input clutches, the TCM having a recorded torque-to-position (TTP) table, the method comprising:
- detecting when the brake applier is released;
- receiving an actual engine torque value from the ECM;
- determining an inertia and an acceleration of the engine;
- calculating, via the TCM, a clutch torque for the first input clutch as a function of the actual engine torque value, the inertia, and the acceleration;
- determining, via the TCM, a commanded clutch torque sufficient to move the vehicle without applying the accelerator applier after the brake applier has been released;
- comparing, via the TCM, the calculated clutch torque to the commanded clutch torque to determine a calculated clutch torque difference between the calculated clutch torque and the commanded clutch torque;
- modifying, via the TCM, the recorded TTP table based on the calculated clutch torque difference to determine a modified bite point;
- and
- transmitting, via the TCM, a modified clutch bite point signal to the first input clutch to thereby command the first input clutch to move to the modified clutch bite point.
A dry dual clutch transmission (dDCT) assembly for a vehicle including a brake applier, an accelerator applier, a brake applier position sensor configured to detect the position of the brake applier, and an engine with an engine control module (ECM), the dDCT assembly comprising:
- a first input clutch;
- a second input clutch;
- a first gear set selectively connected to the engine via the first input clutch;
- a second gear set selectively connected to the engine via the second input clutch;
- a transmission control module (TCM) in communication with the ECM, wherein the TCM has a recorded torque-to-position (TTP) table and is configured to:
- receive a brake applier release signal from the brake applier position sensor to detect if the brake applier has been released;
- receive an actual engine torque value from the ECM;
- determine an inertia and an acceleration of the engine;
- determine, via the TCM, a commanded clutch torque sufficient to move the vehicle without applying the accelerator pedal after the brake applier has been released;
- calculate a clutch torque for the first input clutch as a function of the actual engine torque value, the inertia, and the acceleration;
- compare the calculated clutch torque to the commanded clutch torque provided by the TCM to determine a clutch torque difference between the calculated clutch torque and the commanded clutch torque;
- modify the recorded TTP table based on the clutch torque difference to determine a modified bite point;
- and
- transmit a modified clutch bite point signal to the first input clutch to thereby command the first input clutch to move to the modified clutch bite point.
A vehicle comprising:
- an engine;
- an engine control module (ECM) in communication with the engine;
- and
- a dry dual clutch transmission (dDCT) having first and second input clutches, first and second gear sets selectively connected to the engine via the respective first and second input clutches, and a transmission control module (TCM) in communication with the dDCT and the ECM, the TCM having a recorded torque-to-position (TTP) table;
- wherein the TCM is configured to:
- receive an actual engine torque value from the ECM;
- determine an inertia and an acceleration of the engine;
- calculate a clutch torque for the first input clutch as a function of the actual engine torque value, the inertia, and the acceleration;
- determine, via the TCM, a commanded clutch torque sufficient to move the vehicle without applying an accelerator applier after a brake applier has been released;
- compare the calculated clutch torque to the commanded clutch torque to determine a clutch torque difference between the calculated clutch torque and the commanded clutch torque;
- modify the recorded TTP table based on the clutch torque difference to determine a modified bite point;
- and
- transmit a modified clutch bite point signal to the first input clutch to thereby command the first input clutch to move to the modified clutch bite point.
Dependencies are inferred from the claim text.