Brake system for motor vehicles

Patent metadata

Field	Value
Publication number	US-10391994-B2
Application number	US-201715695077-A
Country	US
Kind code	B2
Filing date	Sep 5, 2017
Priority date	Mar 5, 2015
Publication date	Aug 27, 2019
Grant date	Aug 27, 2019

Abstract

A brake system for vehicles, comprising hydraulically actuatable wheel brakes, a first electrohydraulic brake control device, having an associated pressure-medium. The first brake control device comprises a first pressure-providing device for supplying the wheel brakes. An inlet valve and an outlet valve for setting wheel-specific brake pressures, and a wheel-specific output pressure connection connected to the pressure-medium reservoir by the outlet valves. A second electrohydraulic brake control device, comprises a second pressure-providing device with a first pump having a suction side and a pressure side for supplying a first wheel brake of the wheel brakes. The second brake control device is connected downstream of the first brake control device and the suction side of the first pump is connected to a first of the output pressure connections of the first brake control device. A check valve is connected in parallel with the outlet valve of the first output pressure connection.

First claim

The invention claimed is:

1. A brake system for motor vehicles comprising:
hydraulically actuable wheel brakes;
a first electrohydraulic brake control device having a pressurizing-medium reservoir, wherein the pressurizing-medium reservoir is under atmospheric pressure;
the first electrohydraulic brake control device comprising;
a first electrically controllable pressure-providing device for supplying the hydraulically actuable wheel brakes;
an electrically actuable inlet valve for each of the hydraulically actuable wheel brakes;
an electrically actuable outlet valve for adjusting wheel-specific braking pressures; and
a wheel-specific output pressure connection for each of the hydraulically actuable wheel brakes, wherein the output pressure connections are connected to the pressurizing-medium reservoir via the outlet valves;

a second electrohydraulic brake control device comprises
a second electrically controllable pressure-providing device, the second electrically controllable pressure-providing device comprising
at least a first pump having a suction side and a delivery side for supplying at least a first wheel brake of the hydraulically actuable wheel brakes; and

wherein the second electrohydraulic brake control device is connected downstream of the first electrohydraulic brake control device and the suction side of the first pump is connected to a first output pressure connection of the output pressure connections of the first electrohydraulic brake control device, wherein a non-return valve which opens in the direction of the first output pressure connection is connected in parallel with the outlet valve associated with the first output pressure connection.

2. The brake system of claim 1 , wherein the parallel-connected non-return valve is integrated in a valve core of the corresponding outlet valve.

3. The brake system of claim 1 , wherein the second pressure-providing device further comprises:
a second pump having a suction side and a delivery side for supplying at least a second wheel brake of the hydraulically actuable wheel brakes; and
wherein the suction side of the second pump is connected to a second output pressure connection of the output pressure connections of the first electrohydraulic brake control device, wherein a non-return valve which opens in the direction of the second output pressure connection is connected in parallel with the outlet valve associated with the second output pressure connection.

4. The brake system of claim 3 , wherein the first and the second wheel brake are associated with a front axle of the motor vehicle.

5. The brake system of claim 4 , wherein the second electrohydraulic brake control device is constructed for regulating the brake pressures of the wheel brakes of the front axle on the basis of wheel-speed information of all wheels of the motor vehicle, input-pressure information of the second electrohydraulic brake control device and an electronic braking request.

6. The brake system of claim 5 , wherein the wheels of the rear axle are designed with one of: electrically actuable wheel brakes, electromechanically actuable wheel brakes, electric parking brakes, or with brakes, which can be controlled both hydraulically and electrically, wherein the second electrohydraulic brake control device is constructed for electrically actuating both the electric wheel brakes and electromechanical wheel brakes.

7. The brake system of claim 3 , wherein the second electrohydraulic brake control device comprises a respective low-pressure accumulator for the first and the second pump, wherein the suction side of the first and second pump is connected to the respective low-pressure accumulator via a non-return valve which opens in the direction of the suction side.

8. The brake system of claim 7 , wherein the second electrohydraulic brake control device comprises a respective discharge valve for the first and the second pump, which is normally closed, wherein the wheel brake associated with the first and second pump is connected to the respective low-pressure accumulator via the respective discharge valve.

9. The brake system of claim 3 , wherein the second electrohydraulic brake control device comprises a respective connecting valve for the first and the second pump, which is be normally closed and via which the suction side of the respective first and second pump is connected to the associated output pressure connection of the first brake control device.

10. The brake system of claim 3 , wherein the second pressure-providing device further comprises:
a third pump having a suction side and a delivery side for supplying a third wheel brake of the hydraulically actuable wheel brakes;
a fourth pump having a suction side and a delivery side for supplying a fourth wheel brake of the hydraulically actuable wheel brakes;
wherein the suction side of the third pump is connected to a third output pressure connection of the output pressure connections of the first electrohydraulic brake control device;
wherein the suction side of the fourth pump is connected to a fourth output pressure connection of the output pressure connections of the first electrohydraulic brake control device; and
wherein a respective non-return valve which opens in the direction of the corresponding output pressure connection is connected in parallel with the outlet valve associated with the third output pressure connection and the outlet valve associated with the fourth output pressure connection.

11. The brake system of claim 3 , wherein the delivery side of the first pump is connected to the first wheel brake and a third wheel brake of the hydraulically actuable wheel brakes and the delivery side of the second pump is connected to the second wheel brake and a fourth wheel brake of the hydraulically actuable wheel brakes.

12. The brake system of claim 1 , wherein the outlet valves of the first electrohydraulic brake control device are connected to chambers of the pressurizing-medium reservoir via at least two mutually independent return lines.

13. The brake system of claim 12 , wherein one of the return lines is connected to two of the outlet valves in each case, and wherein the hydraulically actuable wheel brakes belonging to the two outlet valves are connected to the same pressure chamber of a tandem master brake cylinder of the first electrohydraulic brake control device.

Assignees

• Continental Teves Ag & Co Ohg

Inventors

• Drumm Stefan
• Linhoff Paul
• Besier Marco

Classifications

• B60Y2400/81

  Braking systems · CPC title

• B60T13/746

  and mechanical transmission of the braking action · CPC title

• B60T13/686

  in hydraulic systems or parts thereof · CPC title

• B60T13/745 Primary

  acting on a hydraulic system, e.g. a master cylinder · CPC title

• B60T8/4081 Primary

  Systems with stroke simulating devices for driver input (B60T8/4077 takes precedence) · CPC title