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

A method for adapting a biting point pressure 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 of engagement operations of the hybrid disengaging clutch during driving operation of the motor vehicle, each of the engagement operations comprising a rapid filling routine of a hydraulic system for actuating the hybrid disengaging clutch that includes a rapid filling phase and a filling equalization phase, and selecting one of the engagement operations;
• b) implementing the rapid filling routine of the selected one of the engagement operations, a setting pressure being set on the hybrid disengaging clutch during the filling equalization phase, the setting pressure either corresponding to a reduced setting pressure relative to a stored initial biting point pressure at a first adaptation or corresponding to the reduced setting pressure relative to a most recently determined adapted biting point pressure for subsequent adaptations after the first adaptation;
• c) increasing the reduced setting pressure by a predetermined increment to an increased setting pressure, and sampling an actual value set for a test parameter via which a transmission of torque by the hybrid disengaging clutch is derivable directly or indirectly;
• d) comparing the actual value for the test parameter with a setpoint value stored for the test parameter, and using the increased setting pressure used as an adapted biting point pressure for subsequent, non-selected engagement operations when the actual value is greater than or equal to the setpoint value;
• and
• e) using the increased setting pressure as the reduced setting pressure for a repeated implementation of step b, and repeating steps a through d when the actual value is less than the setpoint value.