Patent ID: 7832261

Claim:
A device for determining a saturation point of a vacuum brake booster having a vacuum chamber and a working chamber, the device comprising: a pressure sensor arranged for measuring a pressure prevailing in the vacuum chamber; and an electronic evaluation system, connected to the pressure sensor, for calculating the saturation point with the aid of a mathematical function, on the basis of the pressure prevailing in the vacuum chamber; wherein the mathematical function has a plurality of parameters that are calibrated using a calibration method in which a pressure difference between the working chamber and the vacuum chamber is increased in a first step until the saturation point has definitely been exceeded, and the pressure difference is subsequently dismantled, an output signal of the pressure sensor being evaluated during the dismantling and the saturation point being detected, and a vacuum prevailing in the vacuum chamber at the saturation point, as well as a brake pressure, being stored in order to calibrate the parameters.