Clutch characteristic adaption method for automatic dual clutch transmission

A method for clutch characteristic curve adaptation of an automatic dual-clutch transmission of a vehicle by use of an electronic control device, the transmission comprises two sub-gearboxes each comprising an input shaft (3, 4) connected, via an associated friction clutch (K1, K2), to a drive shaft (2) of a drive motor (M) and a plurality of gears (G1-G6, R) that are shiftable via a friction-synchronized gear clutch (S1-S4), whereby the electronic control device determines a current value of a touch point of the associated friction clutch (K1, K2) in conjunction with a partial engagement of the associated friction clutch (K1, K2) and acquisition of relevant operating parameters with the drive motor (M) operating and the plurality of gears (G1-G6, R) disengaged in a load-free sub-gearbox, the method comprising the steps of:

• initiating a synchronous point of a gear clutch (S1, S3;
• S2, S4) of the load-free sub-gearbox with a defined regulating force of an associated gear regulator;
• waiting until the gear clutch (S1, S3;
• S2, S4) of the load-free sub-gearbox is synchronized;
• incrementally engaging the associated friction clutch (K1;
• K2) of the synchronized gear clutch (S1, S3;
• S2, S4) of the load-free sub-gearbox until the electronic control device determines that the synchronized gear clutch is no longer in synchronization;
• once the synchronized gear clutch is no longer in synchronization, ascertaining, via the electronic control device, a current touch point (xTP, pTP) of the associated friction clutch from a current synchronous torque (MSync) of the gear clutch being synchronized and a current regulating parameter (xK, pK) of the associated clutch regulator, with the current regulating parameter being one of a regulating path, a regulating pressure, a regulating force or an electric regulating current;
• and
• adapting a clutch characteristic curve of the associated friction clutch (K1;
• K2) with the current touch point (xTP, Ptp).