Brake system for automotive vehicles with electric drive

A brake system for automotive vehicles having electric drive comprising:

• an actuating pedal;
• an actuating rod coupled to said actuating pedal and movable in response to said actuating pedal;
• a plurality of vehicle wheels;
• at least one electric drive motor for driving and braking said plurality of vehicle wheels;
• a master brake cylinder defined by a master brake cylinder housing forming a first pressure chamber, a second pressure chamber and a third pressure chamber;
• a plurality of hydraulic friction brakes in pressure fluid communication with said third pressure chamber and individually associated with said plurality of vehicle wheels for braking said plurality of vehicle wheels;
• a pressure sensor in said first pressure chamber for determining a pressure prevailing in said first pressure chamber and for sensing the actuating force of said actuating pedal;
• a position sensor for determining the actuating position of said actuating pedal and for generating actuating pedal position signals;
• an electronic controller responsive to said actuating pedal position signals for generating control signals;
• a control device responsive to said control signals and to said pressure sensor for controlling said at least one electric drive motor;
• a piston which is slidable within limits relative to said master brake cylinder housing and to which the hydraulic pressure prevailing in the second pressure chamber is applied, and having a sealing seat provided in said piston;
• a valve, formed by said sealing seat provided in said piston, operable as an electromagnetically actuated bypass valve responsive to said actuating pedal position signals and operable as a differential-pressure valve, and arranged on said master brake cylinder housing between said second pressure chamber and said third pressure chamber;
• a closing member for closing said sealing seat of said valve;
• an electromagnetically slidable tappet for driving said closing member off of said sealing seat;
• an armature coupled to said tappet;
• an electromagnet surrounding said armature for actuating said armature and energized by said actuating pedal position signals;
• and
• a housing for said electromagnet in which is formed a blind-end bore in which is guided said tappet and having a length slightly larger than the actuating stroke of the tappet.