Patent ID: 6516701
Filing Date: 2003-02-11
Classification: B60T

Abstract:
Brake force booster for automotive vehicles, comprising:a booster housing whose interior space is subdivided by a movable wall into a working chamber and a vacuum chamber, a control housing which carries the movable wall and in which a control valve is arranged for controlling a pressure differential that acts upon the movable wall, the control valve operable by an operating rod by way of a valve piston and by an electromagnet, a sensor which detects the relative displacement between the valve piston and the control housing, wherein the electromagnet is activated and controlled in dependence on the relative displacement between the valve piston and the control housing, further including an electronic actuating device which actuates the electromagnet according to the output signals of the sensor, wherein the electronic actuating device comprises two comparators, and the signal of sensor is applied respectively to one of the inputs of the two comparators, and a signal is applied to the comparison input of one of the two comparators which corresponds to a disconnecting threshold, and a signal is applied to the comparison input of the other comparator which corresponds to a connecting threshold, wherein the two comparators activate respective relays by way of a transistor, wherein the relays are connected in series to the electromagnet.