Patent ID: 6322165
Filing Date: 2001-11-27
Classification: B60T,Y10S

Abstract:
An electronically controllable brake actuation system for motor vehicles, comprising:a master brake cylinder;a plurality of wheel brakes;a pressureless pressure medium reservoir;a pressure source which can be controlled by means of an electronic control unit, by means of which pressure can be applied to the wheel brakes of the vehicle by means of at least one hydraulic connection to the master brake cylinder, which hydraulic connection can be shut off by means of a separating valve;a device for the recognition of an intended slow-down; at least one separating piston arrangement which is connected before the wheel brakes, where a first chamber of this separating piston arrangement can be connected to the master brake cylinder, and a second chamber can be connected through a valve device to the pressure source or to the pressure medium reservoir, the valve device being constructed as a multiple position slide valve;a switching seat valve inserted in the connection between the multiple position valve and the pressure source;wherein the separating piston arrangement includes a stepped piston with a larger and a smaller surface, the larger surface being associated with the pressure source and the smaller surface being associated with a wheel brake;wherein the separating piston delimits a third chamber, which can be connected to the pressure medium reservoir by means of a closable hydraulic connection;wherein the separating piston delimits a hydraulic space, to which a low-pressure accumulator associated with the wheel brakes is connected and which can be connected to the first chamber by means of a nonreturn valve permitting a fluid flow in the direction of the master brake cylinder.