Method for operating a braking system for a motor vehicle, braking system and method for controlling it, computer program product, control unit and motor vehicle

Patent metadata

Field	Value
Publication number	US-12570256-B2
Application number	US-202318509752-A
Country	US
Kind code	B2
Filing date	Nov 15, 2023
Priority date	Nov 15, 2022
Publication date	Mar 10, 2026
Grant date	Mar 10, 2026

Abstract

A method for operating a braking system for a motor vehicle is proposed. The method includes the step of operating at least one rear wheel brake and at least one front wheel brake to perform a parking braking function when there is a requirement for parking braking. Furthermore, a braking system, a method for controlling it, a computer program, a control unit and a motor vehicle are proposed.

First claim

The invention claimed is:

1 . A method for operating a braking system for a motor vehicle, comprising: operating at least one rear wheel brake and at least one front wheel brake to perform a parking braking function when there is a requirement for parking braking
wherein the at least one rear wheel brake and the at least one front wheel brake are operated in such a way that a clamping force caused by the at least one rear wheel brake and a clamping force caused by the at least one front wheel brake are present to cause a desired holding braking force.

2 . The method according to claim 1 , wherein the at least one rear wheel brake and the at least one front wheel brake are operated in such a way that the clamping force caused by the at least one rear wheel brake and the clamping force caused by the at least one front wheel brake are present in a given force distribution to cause the desired parking braking force.

3 . The method according to claim 1 , wherein the at least one rear wheel brake and the at least one front wheel brake are operated in such a way that the clamping force caused by the at least one rear wheel brake and the clamping force caused by the at least one front wheel brake are different from each other when a holding position of the motor vehicle on a slope is detected.

4 . The method according to claim 1 , wherein the at least one rear wheel brake and the at least one front wheel brake are operated in such a way that the clamping force caused by the at least one rear wheel brake is greater than the clamping force caused by the at least one front wheel brake when a holding position of the motor vehicle on a slope with an uphill forward direction of travel is detected.

5 . The method according to claim 1 , wherein the at least one rear wheel brake and the at least one front wheel brake are operated in such a way that the clamping force caused by the at least one rear wheel brake and the clamping force caused by the at least one front wheel brake are a maximum force when a load of the motor vehicle above a specified weight value and a holding position of the motor vehicle on a slope are detected.

6 . The method according to any one of claim 1 , wherein in the event of a detected failure of the parking braking function of at least one of the wheel brakes the at least one remaining wheel brake is operated in such a way that the desired holding braking force is caused by the clamping force of the at least one remaining wheel brake.

7 . The braking system for a motor vehicle, for carrying out a method according to claim 1 , comprising:
at least one rear wheel brake which has a parking braking function and is set up to be assigned to a rear wheel of the motor vehicle, at least one front wheel brake which has a parking braking function and is set up to be assigned to a front wheel of the motor vehicle, and a control unit which is set up to control both the at least one rear wheel brake and the at least one front wheel brake to perform the respective parking braking functions thereof.

8 . The braking system according to claim 7 , wherein the control unit is configured to control the at least one rear wheel brake and the at least one front wheel brake to perform the respective parking braking functions thereof in such a way that a clamping force caused by the at least one rear wheel brake and a clamping force caused by the at least one front wheel brake are present to cause the desired holding braking force.

9 . The braking system according to claim 8 , wherein the control unit is configured to control the at least one rear wheel brake and the at least one front wheel brake to perform the respective parking braking functions thereof in such a way that the clamping force caused by the at least one rear wheel brake and the clamping force caused by the at least one front wheel brake are present in a given force distribution to cause the desired parking braking force.

10 . The braking system according to claim 8 , wherein the control unit is configured to control the at least one rear wheel brake and the at least one front wheel brake to perform the respective parking braking functions thereof in such that an instantaneous load condition of the motor vehicle is taken into account in a force distribution between the clamping force of the at least one rear wheel brake and the clamping force of the at least one front wheel brake and/or in the magnitude of the clamping forces.

11 . The braking system according to claim 8 , wherein the control unit is configured to control the at least one rear wheel brake and the at least one front wheel brake to perform the respective parking braking functions thereof such that the clamping force caused by the at least one rear wheel brake and the clamping force caused by the at least one front wheel brake are different from each other if a holding position of the motor vehicle on a slope is detected.

12 . The braking system according to claim 8 , wherein the control unit is configured to control the at least one rear wheel brake and the at least one front wheel brake to perform the respective parking braking functions thereof in such a way that the clamping force caused by the at least one rear wheel brake is greater than the clamping force caused by the at least one front wheel brake if a holding position of the motor vehicle on a slope with an uphill forward direction is detected.

13 . The braking system according to claim 8 , wherein the control unit is configured to control the at least one rear wheel brake and the at least one front wheel brake to perform the respective parking braking functions thereof in such a way that the clamping force caused by the at least one rear wheel brake and the clamping force caused by the at least one front wheel brake are a maximum force if a load of the motor vehicle above a specified weight value and a holding position of the motor vehicle on a slope are detected.

14 . The braking system according to claim 8 , wherein the control unit is configured to control the at least one remaining wheel brake in the event of a failure of the parking braking function of at least one of the wheel brakes in such a way that the desired parking braking force is caused by the clamping force of the at least one remaining wheel brake.

15 . The braking system according to claim 7 , comprising:
two rear wheel brakes with a parking braking function, one of which can be assigned to a left rear wheel and the other rear wheel brake to a right rear wheel of the motor vehicle, and two front wheel brakes with a parking braking function, one of which can be assigned to a right front wheel and the other front brake to a left front wheel of the motor vehicle.

16 . The braking system according to claim 15 , wherein the control unit is configured to control the two rear wheel brakes and the two front wheel brakes to perform the respective parking braking functions thereof in such a way that the desired parking braking force is caused by the clamping force caused by the respective wheel brake.

17 . The braking system according to claim 15 , wherein the control unit has a connection for signal transfer via a first signal transfer connection to one of the rear wheel brakes and one of the front wheel brakes, the one rear wheel brake has a connection for signal transfer to the other front wheel brake via a second signal transfer connection and the one front wheel brake has a connection for signal transfer to the other rear wheel brake via a third signal transfer connection.

18 . The braking system acc

Assignees

• Zf Active Safety Gmbh

Inventors

• Marx Andreas
• Alford Nicholas
• Bechmann Roman

Classifications

• B60T17/18

  Safety devices; Monitoring · CPC title

• B60T2250/02

  Vehicle mass · CPC title

• B60T2210/20

  Road shapes · CPC title

• B60T8/885

  using electrical circuitry · CPC title

• B60T13/746

  and mechanical transmission of the braking action · CPC title