Patent ID: 8332110

Claim:
A method of detecting both axial wear and one of a counterforce gradient and a rigidity of a system of a multiple disc switching element ( 1 ) with position-controlled actuation with an electric motor ( 2 ), a spur gear stage ( 3 ) and a ball ramp ( 4 ), by one of a hydraulic pressure actuator and an electromagnetic actuator, the method comprising the step of: determining, when a vehicle is at a standstill, the axial wear (J) and the counterforce gradient or the axial wear (J) and the rigidity of the system by an overrun adaptation; scanning an entire operating range (I) of discs of the switching element ( 1 ) with an ascending and a descending position-controlled ramp (C, D) when the vehicle is at a standstill; detecting the axial wear (J) of the discs and the counterforce gradient of the system by averaging corresponding measured values for the ascending and the descending ramp and maintaining a hysteresis (H) of the scanned ramp (C, D) to a minimum by varying motor torque (M motor ).