Patent ID: 7798940

Claim:
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 p BSet ; B: determining of an actual pressure p Act in the pressure system; C: terminating the subjection of the pressure system to the set-filling-pressure p BSet when the actual pressure p Act has reached at a time t 1 a threshold-turnoff-pressure p Off ; D: subjecting the pressure system to a set-abutting-pressure p ASet holding the engagement point of the clutch; E: determining a characteristic K indicating whether after the point in time t 1 between the points in time t 3 and t 4 the actual pressure p Act is above or below the set-abutting-pressure p Aset , F: repeating the cycle with the steps A-E wherein the set-filling-pressure p BSet is changed at every repetition by an increment p until process terminating criterion is fulfilled; and G: storing of the set-filling-pressure p BSet of the last cycle.