PROCESS AND DEVICE FOR CONTROLLING A CLUTCH

A process for controlling a clutch incorporated between the driving engine (M) and the gearbox (G) of a motor vehicle, in which the clutch is a bridging clutch (WK) of a hydrodynamic unit or a separating clutch (K) in a driving train. The process uses devices to measure the engine speed (n-M) and the gearbox output speed (n-ab) and a slip regulating switch mechanism (1). The slip regulating switch mechanism (1) determines the pressure for an actuator (3) of the clutch. The control deviations are derived from a comparison (4) of predetermined slip reference values (w) and the actual slip values (s) obtained from the equipment speeds, and converted to pressures in accordance with a predetermined control algorithm in the regulator (6). The clutch output speed (n-K, n-WK) required for a determination of the slip is obtained from the gear ratio (G-x) and the gear output speed (n-ab). During the shift process (t-0 to t-3), a virtual clutch output speed (n-Kvir) is determined and used to further implement slip control, or the pressure for the actuator (3) of the clutch (K, WK) is varied as a function of predetermined parameters.