Patent ID: 7974758
Filing Date: 2011-07-05
Classification: F16D

Abstract:
1. A method for the setting of the torque transmitted by a friction clutch by means of an actuator chain having an electric motor which effects a displacement of a pressure plate of the friction clutch via a reduction gear unit and a mechanism for the conversion of the rotary movement of the electric motor into a translatory movement, wherein a desired angle of rotation (α Des ) of the electric motor or of a link of the actuator chain is determined from the torque to be transmitted by the friction clutch based on a predetermined torque/angle dependence and is set in a setting procedure by means of a regulator acting on the electric motor, and wherein a calibration procedure takes place for the compensation of wear within the friction clutch which results in a variation of the given torque/angle dependence and, in the calibration procedure, the power consumption of the electric motor on the closing of the clutch is measured, a torque respectively corresponding to the measured power consumption is determined via a given torque/power consumption dependence, and a first correction angle (α′, ≢α′) for the torque/angle dependence is determined from the determined torque and a then currently detected angle of rotation (α Actual ) in the calibration procedure, with a variation of the torque/power consumption dependence caused by wear occurring within the actuator chain additionally being taken into account by determining the number of the setting procedures of the electric motor within a set time interval and using the number for correcting the torque/power consumption dependence.