Patent ID: 6259995
Filing Date: 2001-07-10
Classification: F16D,G01B

Abstract:
A process for determining wear on a clutch disk equipped with friction linings of a friction clutch, which clutch disk is pressed by a pressure plate arranged in a clutch housing against a flywheel of an internal combustion engine, the process comprising the steps of:generating signals in dependence on three detecting elements that rotate with the friction clutch;supplying the signals via a sensor which is arranged outside the clutch housing to an electronic analysis unit, the signals including a first signal series that comprises pulses supplied when the sensor is passed by two detecting elements which are arranged at a defined axial distance to each other and are connected to a first component of the friction clutch, and a second signal series that comprises pulses supplied by a third of the detecting elements, which is connected to a second component of the friction clutch, the pulses from the first and second signal series providing information on an axial position of the respective detecting elements relative to the sensor;determining, in the analysis unit, an actual axial distance between the two detecting elements from the first signal series, comparing the actual axial distance with the defined axial distance, and generating a correction value from a difference between the axial distances;subsequently comparing the pulses of the third detecting element in the second signal series with the pulses of one of the two detecting elements in the first signal series for determining an axial distance (A.sub.1) between the third detecting element and the one of the two detecting elements and then comparing the distance (A.sub.1) with a distance (A.sub.0) between the third detecting element and the one of the two detecting elements when the clutch disk is new; anddetermining wear (V) on the clutch disk using the equationV=A.sub.0 -A.sub.1.+-..DELTA.where .DELTA. is a correction for at least a temperature influence.