Method and device for operating a braking device, braking device

Patent metadata

Field	Value
Publication number	US-10466734-B2
Application number	US-201514880525-A
Country	US
Kind code	B2
Filing date	Oct 12, 2015
Priority date	Oct 14, 2014
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

The disclosure relates to a method for operating a braking device, in particular a parking brake device, which comprises an actuator having an electric motor that displaces an actuator element as desired into a brake application position or into a brake release position, wherein the electric motor is controlled in dependence upon a motor constant and an electrical resistance of the electric motor, characterized in that as the actuator element is displaced a prevailing motor input voltage and a prevailing motor current are ascertained, and that the motor constant and the electrical resistance are determined in dependence upon the ascertained motor input voltage and the ascertained motor current.

First claim

What is claimed is:

1. A method for operating a parking brake device, the parking brake device including an actuator having an electric motor configured to displace an actuator element between a brake application position and a brake release position, the method comprising:
ascertaining a motor input voltage and a motor current as the actuator element is displaced;
determining a motor constant of the electric motor and an electrical resistance of the electric motor based on the ascertained motor input voltage and the ascertained motor current; and
controlling the electric motor based on the determined motor constant and the determined electrical resistance,
wherein the ascertaining of the motor input voltage and the motor current further comprises measuring the motor input voltage and the motor current during a switch-on phase of the parking brake device.

2. The method according to claim 1 , the ascertaining of the motor input voltage and the motor current further comprising:
periodically measuring the motor input voltage and the motor current as the actuator element is displaced.

3. The method according to claim 1 , the ascertaining of the motor input voltage and the motor current further comprising:
measuring the motor input voltage and the motor current while the electric motor has at least one of (i) an constant torque and (ii) a near constant torque.

4. The method according to claim 3 , the ascertaining of the motor input voltage and the motor current further comprising:
measuring the motor input voltage and the motor current during a brake application procedure.

5. The method according to claim 1 , further comprising:
initiating a switch-off phase of the parking brake device in which the controlling of the electric motor is terminated in response to the electric motor having at least one of (i) a constant rotational speed and (ii) a near constant rotational speed.

6. The method according to claim 5 , the determining of the motor constant and an electrical resistance further comprising:
determining the motor constant and the electrical resistance during the switch-off phase.

7. The method according to claim 5 , the determining of the motor constant and an electrical resistance further comprising:
determining the motor constant and the electrical resistance based on a voltage gradient during the switch-off phase.

8. A device for operating an operating a parking brake device of a vehicle, the parking brake device including an actuator having an electric motor configured to displace an actuator element between a brake application position and a brake release position, the device comprising:
a control device configured to (i) measure a motor input voltage and a motor current as the actuator element is displaced, (ii) determine a motor constant of the electric motor and an electrical resistance of the electric motor based on the ascertained motor input voltage and the ascertained motor current, and (iii) control the electric motor based on the determined motor constant and the determined electrical resistance,
wherein the motor input voltage and the motor current are measured during a switch-on phase of the parking brake device.

9. A parking brake device comprising:
an actuator element;
an actuator having an electric motor configured to displace the actuator element between a brake application position and a brake release position; and
a control device configured to (i) measure a motor input voltage and a motor current as the actuator element is displaced, (ii) determine a motor constant of the electric motor and an electrical resistance of the electric motor based on the ascertained motor input voltage and the ascertained motor current, and (iii) control the electric motor based on the determined motor constant and the determined electrical resistance,
wherein the motor input voltage and the motor current are measured during a switch-on phase of the parking brake device.

Assignees

• Bosch Gmbh Robert

Inventors

• Baehrle-Miller Frank
• Sussek Ullrich
• Fleischer Simon
• Blessing Peter

Classifications

• F16D71/00

  Mechanisms for bringing members to rest in a predetermined position (combined with or controlling clutches F16D43/26; means for initiating operation of brakes at a predetermined position F16D65/14; means for securing members after operation F16B1/02) · CPC title

• G05G5/00 Primary

  Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member (G05G17/00 takes precedence) · CPC title

• F16D65/18

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

• B60T13/746 Primary

  and mechanical transmission of the braking action · CPC title

• H02P7/00

  Arrangements for regulating or controlling the speed or torque of electric DC motors · CPC title