초록 ▼

An electronically controllable anti-lock brake actuation system for automotive vehicles, including a pedal actuated dual-circuit master brake cylinder, and braking pressure generators actuatable by an electronic control unit. Each of the braking pressure generators has a piston slidable in a cylinde

An electronically controllable anti-lock brake actuation system for automotive vehicles, including a pedal actuated dual-circuit master brake cylinder, and braking pressure generators actuatable by an electronic control unit. Each of the braking pressure generators has a piston slidable in a cylinder bore from an initial position, each piston separating a first working chamber, to which each one wheel brake of the vehicle is connected directly and the master cylinder is connected by way of a closable hydraulic connection, from a second working chamber and is connected to the master cylinder where the stepped piston is operable to achieve a braking pressure generation or boosting. In one embodiment, first and second electromagnetically operable separating valves are inserted in the connection between the first working chamber and the master brake cylinder, the connection between the master brake cylinder and the second working chamber being effected exclusively by way of the second separating valve, and the initial position of the stepped piston permits a return stroke in opposition to its actuating direction. In another embodiment, no connection exists between the first working chamber and the master brake cylinder. The second working chamber is connected to the master brake cylinder by way of a closable hydraulic connection, and the stepped piston is operable only so as to achieve a braking pressure generation. The closable connection is achieved via an electromagnetically operable valve interposed between the second working chamber and the master brake cylinder, and the connection is open in the valve's first switch position and, in the valve's second switch position, the master brake cylinder is isolated from the second working chamber and a connection is established between the first and the second working chamber. The initial position of the stepped piston permits a return stroke in opposition to its actuating direction.

대표청구항 ▼

[ What is claimed is:] [1.] An electronically controllable anti-locking brake actuation system for an automotive vehicle having a plurality of wheel brakes, said system comprising:a pedal actuated dual-circuit master brake cylinder;an electronic control unit;a plurality of braking pressure generator

[ What is claimed is:] [1.] An electronically controllable anti-locking brake actuation system for an automotive vehicle having a plurality of wheel brakes, said system comprising:a pedal actuated dual-circuit master brake cylinder;an electronic control unit;a plurality of braking pressure generators actuated by said electronic control unit, each of said braking pressure generators having a stepped piston slidable in a cylinder bore in an actuating direction from an initial position and operable for achieving braking pressure generation or boosting, said stepped piston including a first piston surface and a second piston surface that is smaller than said first piston surface, said piston separating said cylinder bore of each of said braking pressure generators into a first working chamber and a second working chamber, said first working chamber confined by said first piston surface and said second working chamber confined by said second piston surface, each of said first working chambers connected directly to one of said wheel brakes of said vehicle and connected to said master brake cylinder through a first closable hydraulic connection, and each of said second working chambers connected to said master brake cylinder through a second closable hydraulic connection, wherein said stepped piston is capable of a return stroke in opposition to said actuating direction thereof;a first electromagnetically operable separating valve; anda second electromagnetically operable separating valve;wherein said first closable hydraulic connection includes said first and second electromagnetically operable separating valves, and said second hydraulic connection exclusively includes said second electromagnetically operable separating valve.