Method for adjusting an incremental path measurement unit in an actuation device of a pressure-closed clutch as well as an actuation device

An actuation device for a pressure-closed clutch comprising:

• an electric motor (10) for the purpose of moving a transmitter piston (16) which is displaceably contained in a cylinder unit (18) with a snifting borehole (34) that, via a hydraulic segment (22), is connected with a cylinder containing a displaceable receiver piston (26), and the receiver piston (26) actuates the clutch (28);
• a self-inhibiting spindle drive (14) for the purpose of converting a rotation of the spindle (14) driven by the electric motor into a linear movement of the transmitter piston (16);
• an incremental sensor (42) to acquire the rotation of the spindle;
• a compensation spring (38) that supports a movement of the transmitter piston in the clutch-closing direction;
• and,
• a control device (44) that acquires a power consumption of the electric motor (10) during the movement of the transmitter piston (16), which is connected with the incremental sensor (42) and which has a storage unit that stores a signal of the incremental sensor in case of an abrupt change of the power consumption as a reference signal.