Patent ID: 9562576
Date: 2017-02-07
CPC Classifications: F16D

Claim:
1. A method for ascertaining a biting point of a friction clutch device of a motor vehicle that is actuatable between a disengaged and an engaged position, said friction clutch device includes a hydrostatic actuator device with at least one position sensor and at least one pressure force sensor, said method comprising the following steps: actuating said friction clutch device in a disengagement and/or engagement direction; ascertaining a pressure in a cylinder of said friction clutch device by means of said at least one pressure force sensor; ascertaining a travel distance traversed by said actuator device by means of said at least one position sensor; compiling a plurality of data points for the pressure and travel distance on a graph to obtain a position-force characteristic curve having a first section and a second section, said first section being linear and said second section being parabolic; ascertaining a last data point of said first section and a first data point of said second section; determining an absolute value of a difference between said last data point of said first section and said first data point of said second section; and, determining a total error characteristic curve based on said absolute value of said difference and said plurality of data points, wherein the biting point is ascertained based on said total error characteristic curve.