Method for setting a hydraulic vehicle brake

Patent metadata

Field	Value
Publication number	US-9308901-B2
Application number	US-201414283930-A
Country	US
Kind code	B2
Filing date	May 21, 2014
Priority date	May 21, 2013
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

A method for operating a vehicle brake having a brake servo unit and a parking brake actuator. In the case of a failure of the brake servo unit, the distance between brake linings of the vehicle brake and brake disk is reduced by actuating the parking brake actuator.

First claim

What is claimed is:

1. A method for operating a hydraulic vehicle brake which is equipped with a brake servo unit including a hydraulic pump for generating a brake force applied on a wheel brake unit in response to pedal actuation, a parking brake function being additionally provided by a parking brake actuator, the method comprising:
in the case of one of a partial failure and a complete failure of the brake servo unit, reducing a separation distance between brake linings of the wheel brake unit and a brake disk to an adjusted non-zero separation distance by actuating the parking brake actuator.

2. The method as recited in claim 1 , wherein the parking brake actuator includes an electric brake motor.

3. The method as recited in claim 2 , wherein a contact of the brake linings with the brake disk is inferred from a current profile of the electric brake motor.

4. The method as recited in claim 1 , wherein the separation distance is reduced between the brake linings and the brake disk by actuating the parking brake actuator in a path-controlled manner.

5. The method as recited in claim 1 , wherein the separation distance between the brake linings and the brake disk is reduced by actuating the parking brake actuator in a force-controlled manner.

6. The method as recited in claim 1 , further comprising retaining the adjusted non-zero separation distance between the brake linings and the brake disk for a period of the one of the partial failure and the complete failure of the brake servo unit.

7. The method as recited in claim 1 , wherein for reducing the separation distance, the brake linings are initially displaced until the brake linings contact the brake disk, and after contact is achieved with the brake disk, the brake linings are moved away again from the brake disk to a limited extent in an opposite direction by actuating the parking brake actuator.

8. A regulating or control unit for implementing a method for operating a hydraulic vehicle brake which is equipped with a brake servo unit including a hydraulic pump for generating a brake force applied on a wheel brake unit in response to pedal actuation, a parking brake function being additionally provided by a parking brake actuator, comprising:
means for reducing, in the case of one of a partial failure and a complete failure of the brake servo unit, a separation distance between brake linings of the wheel brake unit and a brake disk to an adjusted non-zero separation distance by actuating the parking brake actuator.

9. A vehicle brake system in a vehicle, comprising:
a regulating or control unit for implementing a method for operating a hydraulic vehicle brake which is equipped with a brake servo unit including a hydraulic pump for generating a brake force applied on a wheel brake unit in response to pedal actuation, a parking brake function being additionally provided by a parking brake actuator, the regulating or control unit including:
means for reducing, in the case of one of a partial failure and a complete failure of the brake servo unit, a separation distance between brake linings of the wheel brake unit and a brake disk to an adjusted non-zero separation distance by actuating the parking brake actuator.

Assignees

• Foitzik Bertram
• Bussmann Otmar
• Kistner Matthias
• Bosch Gmbh Robert

Inventors

• Foitzik Bertram
• Bussmann Otmar
• Kistner Matthias

Classifications

• B60T13/58

  Combined or convertible systems · CPC title

• B60T17/221

  Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems (hydraulic pressure systems in general F15B19/00, F15B21/04; testing structures or apparatus G01M) · CPC title

• B60T13/741

  acting on an ultimate actuator · CPC title

• B60T13/588

  both fluid and mechanical assistance or drive · CPC title

• B60T7/12 Primary

  for automatic initiation; for initiation not subject to will of driver or passenger {(limiting speed of vehicles other than rail vehicles B60K31/00)} · CPC title