Patent ID: 8366585

Claim:
A method of determining a synchronization point of an automatic double clutch transmission of a motor vehicle comprising two component transmissions each with one input shaft ( 3 , 4 ) connectable via a friction clutch (K 1 , K 2 ) to a drive shaft ( 2 ) of a drive motor (M) and several gears (G 1 -G 6 , R), each shiftable via a friction-synchronized gear clutch (S 1 -S 4 ), whereby when the drive motor (M) is operating, a current value of the synchronization point of an associated gear setter is determined by approaching synchronization of a gear clutch (S 1 , S 3 ; S 2 , S 4 ) and determining a significant change in at least one relevant operating parameter, the method comprising the steps of: selecting the gear clutch (S 1 , S 3 ; S 2 , S 4 ) of a gear (G 1 , G 3 , G 5 ; G 2 , G 4 , G 6 , R) of a momentarily load-free component transmission; moving the associated gear setter to a neutral position; successively moving the associated gear setter to a shifting position of the selected gear (G 1 , G 3 , G 5 ; G 2 , G 4 , G 6 , R) until synchronous running (Δn GK ≈0) is attained on the gear clutch (S 1 , S 3 ; S 2 , S 4 ) within a threshold; determining the current synchronization point (p Sync ) of the gear clutch (S 1 , S 3 ; S 2 , S 4 ) from the current adjustment parameter (p GK ) of the associated gear setter; and adapting a valid synchronization point of the gear clutch (S 1 , S 3 ; S 2 , S 4 ) to the current synchronization point (p Sync ).