Method for adapting a biting point filling time of a hydraulically actuated hybrid disengaging clutch

A method for adapting a biting point filling time of a hydraulically actuated hybrid disengaging clutch arranged in a hybrid drive train of a motor vehicle between an internal combustion engine and an electric machine, the method comprising:

• a) detecting engagement operations of the hybrid disengaging clutch during a driving operation of the motor vehicle, in each of the engagement operations a hydraulic system actuating the hybrid disengaging clutch is filled with fluid in a rapid filling routine, and selecting one of the engagement operations;
• b) implementing the rapid filling routine of the selected one of the engagement operations, the hydraulic system filled during the rapid filling routine of the selected one of the engagement operations with a predetermined filling pressure over a filling time that corresponds to either,
• in a first adaptation, a filling time shortened relative to a stored initial biting point filling time, or,
• in a later adaptation after the initial adaption, a filling time shortened relative to a most recently determined biting point filling time;
• c) increasing a shortened filling time by a predetermined increment to an extended filling time, and sampling an actual value for a test parameter, a transmission of torque via the hybrid disengaging clutch derivable directly or indirectly by the test parameter;
• and
• d) comparing the actual value for the test parameter with a setpoint value stored for the test parameter,
• wherein either the extended filling time is used as an adapted biting point filling time for subsequent, non-selected engagement operations when the actual value is greater than or equal to the set-point value, or the extended filling time is used as the shortened filling time for a repeated implementation of the step b), and steps a) through d) are repeated when the actual value is less than the setpoint value.