Dual clutch transmission vehicle launch control

A dual-clutch transmission (DCT) assembly for a vehicle having an engine with an engine control module (ECM), the DCT assembly comprising:

• a first and a second input clutch;
• a first and a second gear set, wherein the first and second gear sets are selectively connected to the engine via the respective first and second input clutches;
• and
• a transmission control module (TCM) in communication with the ECM, wherein the TCM is configured to receive a launch request, and in response to the received launch request is further configured to:
• receive the actual engine torque value from the ECM;
• determine an inertia and an acceleration of the engine;
• calculate a clutch torque for a designated one of the first and second input clutches as a function of the actual engine torque value and the product of the inertia and acceleration of the engine;
• compare the calculated clutch torque to a commanded clutch torque for the designated input clutch;
• modify a recorded torque to position (TTP) table such that less clutch torque corresponds in the TTP table to a given apply position of the designated input clutch when the calculated clutch torque exceeds the commanded clutch torque, and such that more clutch torque corresponds in the TTP table to the given apply position when the calculated clutch torque is less than the commanded clutch torque;
• and
• transmit a clutch position signal to the designated input clutch to thereby command an apply position extracted from the recorded TTP table.

A method for controlling the launch of a vehicle having an engine, and engine control module (ECM), a dual-clutch transmission (DCT) assembly 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, and a transmission control module (TCM), the method comprising:

• receiving a launch request via the TCM;
• 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 a designated input clutch of the first and second input clutches as a function of the actual engine torque value, the inertia, and the acceleration;
• comparing the calculated clutch torque to a commanded clutch torque for the designated input clutch;
• modifying the recorded TTP table such that less clutch torque corresponds in the TTP table to a given apply position of the designated input clutch when the calculated clutch torque exceeds the commanded clutch torque, and such that more clutch torque corresponds in the TTP table to the given apply position when the calculated clutch torque is less than the commanded clutch torque;
• and
• transmitting a clutch position signal to the designated input clutch to thereby command an apply position extracted from the recorded TTP table.