Patent ID: 8718895

Claim:
A method for determining wheel pressure in an electronically controlled motor vehicle brake system, wherein the brake system includes inlet valves ( 3 ) and outlet valves ( 4 ) in wheel circuits for controlling a pressure in actuators (A . . . D) of the wheel brakes, with at least one of the valves in an area of the actuator being driven by way of one or more driver stage(s) which permits or permit adjusting the valve actuating current, the method comprising: calibrating at least one outlet valve ( 4 ) at least one time, wherein one or more outlet valves are calibrated in terms of their opening current behavior, wherein the valve actuation current is varied and the current at which the valve opens or closes is determined by an anomaly of the current or the voltage, respectively across a valve coil or across a measuring coil arranged in an area of a coil magnetic circuit; opening the outlet valve of one brake circuit by a corresponding electric actuation of the valve during a wheel pressure control operation for verification of the wheel pressure; measuring the actuating current which flows when the valve has opened; and determining the wheel pressure using the current measured is used as an indicator for determining the wheel pressure, taking into consideration the calibration values for the corresponding outlet valve which have been determined according to the calibration method.