procedure for determination of the anlegepunktes an automatically actuated reibungskupplung

摘要

The invention relates to a method for determining the application point of an automatically controlled friction clutch for a motor vehicle automatic gearbox. The inventive method consists in automatically separating the clutch after pre-selecting a new speed, in disengaging the inserted speed, in bringing the engine speed up to a target value for a new speed and in advancing the clutch at a higher advance speed to the application point in which the gearbox input shaft is correctly entrained. In order to determine the application point, the time progression gradient of the input shaft rotational speed is controlled, an important modification of said gradient, which is set when the application point is attained, is detected and the clutch position at that time is defined as application point. The application point determination is preferably carried out during switching back, wherein the speed of rotation of the gearbox input shaft between speed decreasing and a new minimum exhibiting acceleration is easily and accurately determinable.