Method for determining the filling pressure for a clutch

Method for determining the filling pressure for a clutch that comprises clutch linings, a clutch release spring, and a hydraulic pressure system for closing the clutch against the force of the clutch release spring, wherein at an engagement point of the clutch, the clutch linings abut against each other and any further increase in pressure in the pressure system immediately creates the capacity of the clutch in transmitting a torque, said method comprising the following steps:

• A:
• subjecting the pressure system to a set-filling-pressure pBSet;
• B:
• determining of an actual pressure pAct in the pressure system;
• C:
• terminating the subjection of the pressure system to the set-filling-pressure pBSet when the actual pressure pAct has reached at a time t1 a threshold-turnoff-pressure pOff;
• D:
• subjecting the pressure system to a set-abutting-pressure pASet holding the engagement point of the clutch;
• E:
• determining a characteristic K indicating whether after the point in time t1 between the points in time t3 and t4 the actual pressure pAct is above or below the set-abutting-pressure pAset,
• F:
• repeating the cycle with the steps A-E wherein the set-filling-pressure pBSet is changed at every repetition by an increment p until process terminating criterion is fulfilled;
• and
• G:
• storing of the set-filling-pressure pBSet of the last cycle.