Method for checking the plausibility of the position of the clutch actuator of a clutch, method for determining the touch point of a clutch, and device for carrying out the method

A method for checking the plausibility of an actuation position of a clutch of a double-clutch transmission operated by an actuator, comprising the following steps:

• disengaging the clutch assigned to a currently active old subtransmission and simultaneously engaging the clutch assigned to a new subtransmission to shift from a gear selected in the old subtransmission to a gear selected in the new subtransmission;
• deselecting the gear selected in the old subtransmission during an overlapping operation of the clutches or immediately thereafter;
• detecting a difference between a speed of rotation of a drive shaft of the double-clutch transmission driven by a drive motor and a speed of rotation of an input shaft of the old subtransmission;
• and
• evaluating the state of the clutch assigned to the old subtransmission as disengaged when the difference in speeds of rotation of the drive shaft of the double-clutch transmission and the input shaft of the old subtransmission exceeds a predetermined value within a predetermined time after deselection of the gear.