Patent ID: 6851764
Filing Date: 2005-02-08
Classification: B60T

Abstract:
1. Method for controlling an electronically controllable brake actuating system for automotive vehicles, said brake actuating system of the type including a depressurized pressure medium supply reservoir, with at least one pressure source controlled by an electronic control unit, said pressure source being used to apply pressure to the wheel brakes of the vehicle, with pressure sensors and pressure control valves being associated with said wheel brakes, said pressure control valves being controllable in an analog manner by means of an electric variable in dependence on the differential pressure applied to them and connecting the wheel brakes to the pressure source in a pressure increase phase, being closed or becoming closed in a pressure maintenance phase and connecting the wheel brakes to the pressure medium supply reservoir in a pressure reduction phase, comprising the step of: identifying the presence of a pressure maintenance phase, then, slowly varying the electric variable in the pressure control valve until a predetermined pressure variation takes place in the wheel brake associated with said pressure control valve, whereupon the dependence of the electric variable on the differential pressure is corrected, further including the step of observing cyclically in a time window the pressure variation in the wheel brake associated with the pressure control valve during the variation of the electric variable, and determining the minimum pressure value in each case which, in turn, is taken into account for determining a detection threshold for the pressure change at the inlet of the pressure control valve used for pressure reduction.