Electronically controllable braking system having two levels of redundancy

Patent metadata

Field	Value
Publication number	US-11370404-B2
Application number	US-202017437441-A
Country	US
Kind code	B2
Filing date	Mar 4, 2020
Priority date	Mar 12, 2019
Publication date	Jun 28, 2022
Grant date	Jun 28, 2022

Abstract

An electronically controllable braking system for a commercial vehicle is provided, including a service brake system having a front axle brake circuit with a front axle modulator, a rear axle brake circuit, and a central control module. The central control module is configured to implement a braking specification via the front axle brake circuit and the rear axle brake circuit. A parking brake module that is configured, in the event of a defect in the central control module, to process the braking requirement and to output a rear axle redundancy brake pressure to spring-brake parts for the redundant implementation of the braking specification. It is further provided that the front axle modulator is configured to process the braking specification and to output a front axle redundancy brake pressure to the front axle brakes for the further redundant implementation of the braking specification.

First claim

The invention claimed is:

1. An electronically controllable braking system for a vehicle, the electronically controllable braking system comprising:
a service brake system including:
a front axle brake circuit with a front axle modulator and front axle brakes connected thereto,
a rear axle brake circuit with rear axle brakes, and
a central control module connected to a vehicle BUS,
wherein a front axle service brake pressure can be supplied to the front axle brakes and a rear axle service brake pressure can be supplied to the rear axle brakes, and the central control module is configured to generate a service brake control signal in dependence upon a braking specification, wherein the front axle service brake pressure and rear axle service brake pressure can be generated in dependence upon the service brake control signal and specified to the front axle brakes and rear axle brakes, respectively, under the electrical control of the central control module for implementation of the braking specification via the front axle brake circuit and the rear axle brake circuit; and
a parking brake circuit including a parking brake module configured, in the event of a defect in the central control module, to process the braking specification and to output, at least in dependence upon the braking specification, a rear axle redundancy brake pressure to spring-brake parts for redundant implementation of the braking specification; wherein
the front axle modulator is connected to the central control module for receiving the service brake control signal and outputting the front axle service brake pressure to the front axle brakes in dependence upon the service brake control signal,
the front axle modulator is further configured, in the event of a further defect in the parking brake module, to process the braking specification and to output, at least in dependence upon the braking specification, a front axle redundancy brake pressure to the front axle brakes for the redundant implementation of the braking specification.

2. The electronically controllable braking system according to claim 1 , wherein the front axle modulator is connected by a BUS connection to the central control module and/or the parking brake module.

3. The electronically controllable braking system according to claim 1 , wherein the front axle modulator is connected to a vehicle BUS.

4. The electronically controllable braking system according to claim 1 , wherein the central control unit, the parking brake module and the front axle modulator are supplied by substantially separate first, second and third power sources, respectively.

5. The electronically controllable braking system according to claim 1 , wherein the front axle brake circuit has first and second redundancy ABS (Anti-lock Braking System) valves or redundantly actuated ABS valves for traction-controlled outputting of the front axle redundancy brake pressure, wherein the first and second redundancy ABS valves or the redundantly actuated ABS valves are connected to the parking brake module for receiving electrical switching signals.

6. The electronically controllable braking system according to claim 1 , wherein the rear axle brake circuit has third and fourth redundancy ABS (Anti-lock Braking System) valves for traction-controlled outputting of the rear axle redundancy brake pressure, wherein the third and fourth redundancy ABS valves are connected to the parking brake module for receiving electrical switching signals.

7. The electronically controllable braking system according to claim 1 , further comprising a redundancy ESC (Electronic Stability Control) module connected to the parking brake module or integrated therewith.

8. The electronically controllable braking system according to claim 1 , further comprising a redundant steering angle sensor.

9. The electronically controllable braking system according to claim 1 , wherein the front axle modulator includes a pneumatic front axle brake pressure port for receiving a pneumatic braking specification, wherein the front axle modulator is configured to pneumatically output the front axle brake pressure on the basis of the pneumatic braking specification.

10. The electronically controllable braking system according to claim 9 , wherein the parking brake module includes a first redundancy pressure port for providing a first redundancy pressure at the pneumatic front axle brake pressure port for the outputting of the redundant front axle brake pressure by the front axle modulator in the event of a defect in the central control module.

11. The electronically controllable braking system according to claim 1 , comprising a brake signal transmitter connected to the central control module via a first electrical brake signal transmitter line and connected to the parking brake module via a second electrical brake signal transmitter line.

12. The electronically controllable braking system according to claim 11 , wherein the brake signal transmitter is connected to the front axle modulator via a pneumatic brake signal transmitter line for outputting of a pneumatic braking specification at a pneumatic front axle brake pressure port.

13. The electronically controllable braking system according to claim 1 , wherein the parking brake module includes a second redundancy pressure port for receiving a second redundancy pressure corresponding to the front axle brake pressure or a pressure derived therefrom.

14. A vehicle having an electronically controllable braking system according to claim 1 .

15. A method for controlling the electronically controllable braking system according to claim 1 , the method comprising:
determining whether the braking specification can be implemented via the front axle brake circuit and/or the rear axle brake circuit under the electrical control of the central control module;
responsive to determining that implementation of the braking specification via the front axle brake circuit and/or the rear axle brake circuit under the electrical control of the central control module is prevented:
determining whether the braking specification can be implemented via the front axle brake circuit and/or the parking brake circuit under the electrical control of the parking brake module; and
responsive to determining that implementation of the braking specification via the front axle brake circuit and/or the parking brake circuit under the electrical control of the parking brake module is not prevented:
outputting the front axle redundancy brake pressure and the rear axle redundancy brake pressure to the front axle brakes or the spring-brake parts for the implementation of the braking specification via the front axle brake circuit and the parking brake circuit under the electrical control of the parking brake module.

16. The method according to claim 15 , wherein, responsive to determining that implementation of the braking specification via the front axle brake circuit and/or the parking brake circuit under the electrical control of the parking brake module is prevented:
determining whether the braking specification can be implemented via the front axle brake circuit and/or the parking brake circuit under the electrical control of the front axle modulator; and
responsive to determining that implementation of the braking specification via the front axle brake circuit and/or the parking brake circuit under the electrical control of the front axle modulator is not prevented:
outputting the front axle redundancy brake pressure and the rear axle redundancy brake pressure at the front axle brakes or the spring-brake parts for the implementation

Assignees

• Zf Cv Systems Hannover Gmbh

Inventors

• Michaelsen Arne
• Otremba Robert
• Van Thiel Julian

Classifications

• B60T13/662 Primary

  characterised by specified functions of the control system components · CPC title

• B60T2270/402

  Back-up · CPC title

• B60T13/683

  in pneumatic systems or parts thereof (in vacuum systems B60T13/72) · CPC title

• B60T2240/00

  Monitoring, detecting wheel/tyre behaviour; counteracting thereof · CPC title

• B60T2270/10

  ABS control systems · CPC title