Brake System for Motor Vehicles. and Method for Operating the Brake System
First Claim
1. A brake system for motor vehicles, which brake system can be actuated in a brake-by-wire operating mode both by the vehicle driver and independently of the vehicle driver, and is preferably operated in the brake-by-wire operating mode, and can be operated in at least one fallback operating mode, comprising;
- a brake master cylinder (2) with a housing (21) and two pistons (15, 16) which delimit two pressure spaces (17, 18) in the housing (21), the pressure spaces (17, 18) each assigned to one of the two brake circuits (I, II) with wheel brakes (8, 9, 10, 11),a pressure medium storage vessel (4) for storing a pressure medium with at least two chambers which are assigned to the two brake circuits (I, II),a brake pedal (1) which is coupled to the brake master cylinder for actuating the brake master cylinder (2),an electrically operable normally open, separating valve (23a, 23b) per each of the two brake circuits (I, II) for separating each brake circuit into two sections including a first section (22a, 22b) which is connected to an inlet connector of the separating valve and being connected to the brake master cylinder (2), and a second section (13a, 13b) which is connected to an outlet connector of the separating valve being connected to the wheel brakes,a first electrically controllable pressure provision device (5) which is formed by a cylinder and a piston arrangement, the piston (36) actuated by an electromechanical actuator (35),a simulation device (3) which can be connected hydraulically by means of an electrically actuable simulator release valve (32) to at least one of the pressure spaces (17) of the brake master cylinder (2) and imparts a pleasant haptic brake pedal feeling to the vehicle driver in the brake-by-wire operating mode,a first electronic control and regulating unit (12) for actuating the first pressure provision device (5), the separating valves (23a, 23b), and the simulator release valve (32), anda second electrically controllable pressure provision device (49, 149, 249) with a suction connector and a pressure connector for each of the two brake circuits (I, II), the pressure connector being connected to the inlet connector of the separating valve (23a;
23b) which is assigned to each of the two brake circuits (I;
II).
2 Assignments
0 Petitions
Accused Products
Abstract
A motor vehicle brake system actuated in brake-by-wire and fallback operating modes, having a brake master cylinder, brake circuits, a pressure medium storage vessel, a brake pedal, a separating valve for separating the brake circuit into a first section connected to the separating valve the master cylinder, and a second section connected to the separating valve and the wheel brakes. A first pressure provision device has a piston actuated by an actuator, a simulation device connected by a simulator release valve to the master cylinder for a pleasant brake pedal feel in the brake-by-wire operating mode. A first electronic control and regulating unit actuates the first pressure provision device, the separating valves and the simulator release valve. A second pressure provision device has a suction connector and a pressure connector per brake circuit being connected to the inlet of the separating valve.
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Citations
14 Claims
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1. A brake system for motor vehicles, which brake system can be actuated in a brake-by-wire operating mode both by the vehicle driver and independently of the vehicle driver, and is preferably operated in the brake-by-wire operating mode, and can be operated in at least one fallback operating mode, comprising;
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a brake master cylinder (2) with a housing (21) and two pistons (15, 16) which delimit two pressure spaces (17, 18) in the housing (21), the pressure spaces (17, 18) each assigned to one of the two brake circuits (I, II) with wheel brakes (8, 9, 10, 11), a pressure medium storage vessel (4) for storing a pressure medium with at least two chambers which are assigned to the two brake circuits (I, II), a brake pedal (1) which is coupled to the brake master cylinder for actuating the brake master cylinder (2), an electrically operable normally open, separating valve (23a, 23b) per each of the two brake circuits (I, II) for separating each brake circuit into two sections including a first section (22a, 22b) which is connected to an inlet connector of the separating valve and being connected to the brake master cylinder (2), and a second section (13a, 13b) which is connected to an outlet connector of the separating valve being connected to the wheel brakes, a first electrically controllable pressure provision device (5) which is formed by a cylinder and a piston arrangement, the piston (36) actuated by an electromechanical actuator (35), a simulation device (3) which can be connected hydraulically by means of an electrically actuable simulator release valve (32) to at least one of the pressure spaces (17) of the brake master cylinder (2) and imparts a pleasant haptic brake pedal feeling to the vehicle driver in the brake-by-wire operating mode, a first electronic control and regulating unit (12) for actuating the first pressure provision device (5), the separating valves (23a, 23b), and the simulator release valve (32), and a second electrically controllable pressure provision device (49, 149, 249) with a suction connector and a pressure connector for each of the two brake circuits (I, II), the pressure connector being connected to the inlet connector of the separating valve (23a;
23b) which is assigned to each of the two brake circuits (I;
II).- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for operating a brake system comprising the steps of providing a brake master cylinder (2) with a housing (21) and two pistons (15, 16) which delimit two pressure spaces (17, 18) in the housing (21), which pressure spaces (17, 18) are assigned to one of the two brake circuits (I, II) with wheel brakes (8, 9, 10, 11),
a pressure medium storage vessel (4) for a pressure medium with at least two chambers which are assigned to the two brake circuits (I, II), a brake pedal (1) which is coupled to the brake master cylinder for actuating the brake master cylinder (2), an electrically operated normally open, separating valve (23a, 23b) for each of the two brake circuits (I, II) for separating the brake circuits into two sections including a first section (22a, 22b) which is connected to an inlet connector of the separating valve being connected to the brake master cylinder (2), and a second section (13a, 13b) which is connected to an outlet connector of the separating valve being connected to the wheel brakes, a first electrically controllable pressure provision device (5) which is formed by a cylinder and a piston arrangement, the piston (36) of which can be actuated by an electromechanical actuator (35), a simulation device (3) which can be connected hydraulically by means of an electrically actuable simulator release valve (32) to at least one pressure space (17) of the brake master cylinder (2) and imparts a pleasant brake pedal haptic feeling to the vehicle driver in the brake-by-wire operating mode, and a first electronic control and regulating unit (12) for actuating the first pressure provision device (5), the separating valves (23a, 23b) and the simulator release valve (32), a second electrically controllable pressure provision device (49, 149, 249) with a suction connector and a pressure connector for each of the two brake circuits (I, II), the pressure connector per brake circuit being connected to the inlet connector of the separating valve (23a; -
23b) which is assigned to the brake circuit (I;
II),the pressure medium is sucked by means of the second electrically controllable pressure provision device (49, 149, 249) from one of the pressure spaces (17, 18) of the brake master cylinder (2) or from a pressure medium container (4, 150) and is fed into at least one of the brake circuits (I, II), if no pressure build-up or dissipation can be carried out by means of the first pressure provision device (5) and the vehicle driver actuates the brake pedal (1). - View Dependent Claims (14)
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23b) which is assigned to the brake circuit (I;
Specification