Importance

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Abstract

A vehicle drive train, has a clutch unit actuatable by an actuating unit, and a sensor for determining the coupling status. The actuating unit includes an electromagnetic actuator having a piston movable from a starting to an end position. At least the piston and the clutch are acted on by a transmission fluid. Operating the drive train can include:

a) actuating the actuator and moving the piston from the starting position;b) ascertaining a measured sensor value;c) ascertaining a temperature of the transmission fluid by measuring an electrical resistance of the actuator and/or measuring a first time interval between actuation of the actuator according to step a) and the detection by the sensor of an intermediate position that is reached by the piston;d) determining an actual position of the piston based on the measured sensor value and the temperature; ande) moving the piston, starting from the determined actual position, into the end position.

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First Claim