Method for reducing low-frequency vibrations in the drive train of a motor vehicle

The invention relates to a method for reducing intermittently occurring vibrations, in particular shudder vibrations of a sub-assembly which is automatically controlled by an actuator, in particular a clutch actuator, on the basis of a set-point torque, in particular a clutch set-point torque assigned to a clutch torque that is to be transmitted, said sub-assembly being arranged in particular in a drive train of a motor vehicle between an internal combustion engine and a transmission and being in particular a friction clutch having an actual torque that is affected by recurrent vibrations. According to the invention, vibration portions having a known form with unknown coefficients are continuously calculated from an input signal that is representative of an actual vibration-affected torque on the basis of a known transmission behaviour of said actual torque, an in-phase correction torque is determined from said portions and the correction torque is used to correct the set-point torque. In order to separate an