Patent ID: 8271171

Claim:
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 (K 1 , K 2 ), to a drive shaft ( 2 ) of a drive motor (M) and a plurality of gears (G 1 -G 6 , R) that are shiftable via a friction-synchronized gear clutch (S 1 -S 4 ), whereby the electronic control device determines a current value of a touch point of the associated friction clutch (K 1 , K 2 ) in conjunction with a partial engagement of the associated friction clutch (K 1 , K 2 ) and acquisition of relevant operating parameters with the drive motor (M) operating and the plurality of gears (G 1 -G 6 , R) disengaged in a load-free sub-gearbox, the method comprising the steps of: initiating a synchronous point of a gear clutch (S 1 , S 3 ; S 2 , S 4 ) of the load-free sub-gearbox with a defined regulating force of an associated gear regulator; waiting until the gear clutch (S 1 , S 3 ; S 2 , S 4 ) of the load-free sub-gearbox is synchronized; incrementally engaging the associated friction clutch (K 1 ; K 2 ) of the synchronized gear clutch (S 1 , S 3 ; S 2 , S 4 ) 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 (x TP , p TP ) of the associated friction clutch from a current synchronous torque (M Sync ) of the gear clutch being synchronized and a current regulating parameter (x K , p K ) 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 (K 1 ; K 2 ) with the current touch point (x TP , Ptp ).