Method for adjusting a parking brake in a vehicle

Patent metadata

Field	Value
Publication number	US-9441689-B2
Application number	US-201214007062-A
Country	US
Kind code	B2
Filing date	Jan 26, 2012
Priority date	Mar 25, 2011
Publication date	Sep 13, 2016
Grant date	Sep 13, 2016

Abstract

In a method for adjusting a parking brake, which includes an electromechanical braking device having an electric brake motor, the brake motor is braked upon reaching an end position.

First claim

What is claimed is:

1. A method for adjusting a parking brake in a vehicle that includes an electromechanical braking device having an electric brake motor, the brake motor being adjusted to generate an electromechanical clamping force to a first end position and to release the clamping force to a second end position, the method comprising:
actuating the brake motor to bring the brake motor towards an end position corresponding to one of the first end position and the second end position;
initiating an electrical braking of the brake motor upon reaching the end position, wherein the electrical braking applies a braking torque based on a reduction of a current of the brake motor or a speed of the brake motor, the reduction being sufficient to decelerate the brake motor to a standstill; and
controlling a duration of the electrical braking such that the brake motor is braked for a defined braking period.

2. The method according to claim 1 , wherein the brake motor is electrically braked by being short-circuited.

3. The method according to claim 1 , wherein the duration of the electrical braking is determined by monitoring a motor-related state variable.

4. The method according to claim 3 , wherein the motor-related state variable is a motor current, and wherein the brake motor is electrically braked until the motor current falls below a limiting value corresponding to the standstill of the electric motor.

5. The method according to claim 1 , wherein the brake motor is electrically braked until a motor speed falls below a limiting value corresponding to the standstill of the electric motor.

6. The method according to claim 1 , wherein the defined braking period ends with whichever ends first of:
a defined maximum braking period that begins when the electrical braking is initiated, and
a defined period that begins when a motor current or a motor speed falls below a limiting value corresponding to the standstill of the electric motor.

7. A regulating or control device for carrying out a method for adjusting a parking brake in a vehicle that includes an electromechanical braking device having an electric brake motor, the brake motor being adjusted to generate an electromechanical clamping force to a first end position and to release the clamping force to a second end position, wherein the method comprises:
actuating the brake motor to bring the brake motor towards an end position corresponding to one of the first end position and the second end position;
initiating an electrical braking of the brake motor upon reaching the end position, wherein the braking applies a braking torque based on a reduction of a current of the brake motor or a speed of the brake motor, the reduction being sufficient to decelerate the brake motor to a standstill; and
controlling a duration of the electrical braking such that the brake motor is braked for a defined braking period.

8. The regulating or control device according to claim 7 , wherein the brake motor is electrically braked by being short-circuited.

9. The regulating or control device according to claim 7 , wherein the duration of the electrical braking is determined by monitoring a motor-related state variable.

10. The regulating or control device according to claim 9 , wherein the motor-related state variable is a motor current, and wherein the brake motor is electrically braked until the motor current falls below a limiting value corresponding to the standstill of the electric motor.

11. The regulating or control device according to claim 7 , wherein the brake motor is electrically braked until a motor speed falls below a limiting value corresponding to the standstill of the electric motor.

12. The regulating or control device according to claim 7 , wherein the defined braking period ends with whichever ends first of:
a defined maximum braking period that begins when the electrical braking is initiated, and
a defined period that begins when a motor current or a motor speed falls below a limiting value corresponding to the standstill of the electric motor.

13. A parking brake in a vehicle having a regulating or control device for carrying out a method for adjusting a parking brake in a vehicle that includes an electromechanical braking device having an electric brake motor, the brake motor being adjusted to generate an electromechanical clamping force to a first end position and to release the clamping force to a second end position, wherein the method comprises:
actuating the brake motor to bring the brake motor towards an end position corresponding to one of the first end position and the second end position; and
initiating an electrical braking of the brake motor upon reaching the end position, wherein the electrical braking applies a braking torque based on a reduction of a current of the brake motor or a speed of the brake motor, the reduction being sufficient to decelerate the brake motor to a standstill; and
controlling a duration of the electrical braking such that the brake motor is braked for a defined braking period.

14. The parking brake according to claim 13 , wherein the brake motor is electrically braked by being short-circuited.

15. The parking brake according to claim 13 , wherein the duration of the electrical braking is determined by monitoring a motor-related state variable.

16. The parking brake according to claim 15 , wherein the motor-related state variable is a motor current, and wherein the brake motor is electrically braked until the motor current falls below a limiting value corresponding to the standstill of the electric motor.

17. The parking brake according to claim 13 , wherein the brake motor is electrically braked until a motor speed falls below a limiting value corresponding to the standstill of the electric motor.

18. The parking brake according to claim 13 , wherein the defined braking period ends with whichever ends first of:
a defined maximum braking period that begins when the braking is initiated, and
a defined period that begins when a motor current or a motor speed falls below a limiting value corresponding to the standstill of the electric motor.

19. A method for adjusting a parking brake in a vehicle that includes an electromechanical braking device having an electric brake motor, the brake motor being adjusted to generate an electromechanical clamping force to a first end position and to release the clamping force to a second end position, the method comprising:
actuating the brake motor to bring the brake motor towards an end position corresponding to one of the first end position and the second end position; and
initiating a braking of the brake motor upon reaching the end position, wherein the braking applies a braking torque that decelerates the brake motor to a standstill, and wherein the brake motor is electrically braked by being short-circuited.

Assignees

• Baehrle-Miller Frank
• Putzer Tobias
• Bosch Gmbh Robert

Inventors

• Baehrle-Miller Frank
• Putzer Tobias

Classifications

• B60T13/741

  acting on an ultimate actuator · CPC title

• B60T13/662

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

• F16D65/18 Primary

  adapted for drawing members together {, e.g. for disc brakes} · CPC title

• B60T13/588 Primary

  both fluid and mechanical assistance or drive · CPC title