Abstract: A method controls a clutch actuator, comprising a clutch cylinder piston of a clutch cylinder, which clutch cylinder piston moves an actuation element of a friction clutch along an actuation path, and comprising a hydraulic pump, which actuates the clutch cylinder piston by means of a pressure medium pumped along a hydrostatic path and which is operated by means of an electric motor. In order to determine an actuation state of the friction clutch, the operating state along the actuation path is estimated by means of a pressure medium volumetric flow rate produced by the pump and by means of a leakage volumetric flow rate of the pump.

Abstract: A method for determining a service life of a friction clutch of a vehicle with a clutch actuation system includes setting a maximum torque at the friction clutch of the clutch actuation system. The method also includes incrementing a service life counter when an unintended slip at the friction clutch occurs, determining that wear has occurred on the friction clutch in response to reaching a specific counter value of the service life counter, and multiplying a weighted sensitivity factor by a first absolute vale which increments the counter in response to an unintended slip occurring.