Method for reducing chatter vibrations of a friction clutch in a drivetrain of a motor vehicle

A method for reducing chatter vibrations of a friction clutch situated in a drivetrain of a motor vehicle between an internal combustion engine and a transmission, controlled automatically by a clutch actuator, on the basis of a target torque (M(target)) assigned to a clutch torque that is to be transmitted, having an actual present clutch torque (M(actual)) which is marked by vibrations as a result of occasionally occurring vibrations, comprising:

• obtaining an absolute amplitude (A) and a phase (φ) of an input signal (IS(A, φ)), the input signal (IS(A, φ)) representative of vibration-marked clutch torque (M(v)) on the basis of a guidance variable (GV(n)) derived in a torque pattern between the internal combustion engine and the friction clutch;
• determining, from the absolute amplitude (A) and the phase (φ) of the input signal (IS(A, φ)), these a phase-selective disturbance clutch torque (M(disturbance)) by means of a transfer function that depicts a vibration-selective clutch torque;
• determining, from the disturbance clutch torque (M(disturbance)), a phase-correct correction clutch torque (M(correction));
• and
• correcting, using the phase-correct-correction clutch torque (M(correction)), the target clutch torque (M(target)).