Patent ID: 8172059

Claim:
A clutch system with friction clutch automatically actuated by an actuator having a hydrostatic clutch withdrawal system, comprising: a control unit activating the actuator; a slave cylinder; and a master cylinder connected with and pressurizing said slave cylinder through a line, the master cylinder including a resting state, wherein a master cylinder piston is positioned to uncover a connection opening to a reservoir, and the master cylinder piston is actuated according to a pressure pattern to cover and uncover the connection opening at different actuation travels, wherein pressure patterns of the clutch withdrawal system are determined and dependent upon an actuation velocity of the master cylinder piston, and wherein, in the pressure pattern of the master cylinder piston, starting from the resting state, cycles of fast and slow actuations of the master cylinder piston are performed in an actuation direction with increasing displacement from a starting point in the actuation direction, in order to determine closure of the connection opening through a distance that tends to zero relative to an actuation travel.