Method and device for determination a touch point of a friction clutch

摘要

A method of determining a touch-point of a friction clutch of a motor vehicle that is relevant for control purposes such that a current, actual touch-point of the friction clutch is determined adaptively, and such that the current touch-point is modified, with a correction value that depends on the elasticity of the friction clutch, in order to determine the control-relevant touch-point. The control device comprises elements for carrying out the method.

主权项

1. A method of determining a touch-point of a friction clutch of a motor vehicle, with the touch-point being relevant for control purposes, such that a current actual touch-point of the friction clutch is determined adaptively, the method comprising the steps of:
modifying, with a control device, the current touch-point with a correction value that depends on an elasticity of the friction clutch in order to determine a control-relevant touch-point; and defining the elasticity of the friction clutch as a function of a relative difference between a value of the current touch-point on a characteristic curve and a value of an inflection point of the friction clutch on the characteristic curve, the friction clutch being more elastic, the greater the relative difference is, and the friction clutch being less elastic, the smaller the relative difference is.