Braking mechanism for a motor vehicle, and method for controlling the braking mechanism when different force components are combined

Patent metadata

Field	Value
Publication number	US-10821952-B2
Application number	US-201515515376-A
Country	US
Kind code	B2
Filing date	Aug 10, 2015
Priority date	Oct 6, 2014
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

A method for performing a parking brake application process in a motor vehicle with a service brake and a parking brake includes combining a hydraulic force component and a mechanical force component to obtain a total clamping force for the parking brake application process. The two force components are combined in each parking brake application process.

First claim

The invention claimed is:

1. A method for carrying out a parking brake process with a motor vehicle that includes a service brake and a parking brake, the method comprising:
operating the service brake and the parking brake in a superposition mode,
wherein, in the superposition mode, a hydraulic force component and a mechanical force component are combined to achieve a total clamping force for the parking brake process,
wherein the superposition of the hydraulic force component and the mechanical force component to achieve the total clamping force in the superposition mode is carried out for every parking brake process,
wherein the mechanical force component is generated by an electric motor,
wherein the electric motor is configured to generate a maximum mechanical force that is less than the total clamping force, and
wherein the service brake generates a defined hydraulic pressure to produce the hydraulic force component, and the defined hydraulic pressure is the same for every parking brake process.

2. The method as claimed in claim 1 , wherein the mechanical force component comprises an electromechanical force component and the hydraulic force component comprises an electrohydraulic force component,
wherein the electromechanical force component is generated by an automated parking brake and the electrohydraulic force component is generated by the hydraulic service brake, and
wherein the generation and the superposition of the electromechanical force component and the electrohydraulic force component is carried out for every parking brake process.

3. The method as claimed in claim 1 , wherein the parking brake process includes at least one force build-up phase, and wherein the superposition of the force components is essentially carried out during the entire force build-up phase.

4. The method as claimed in claim 2 , wherein on the activation of the parking brake process, the electrohydraulic force component is generated in a first step.

5. The method as claimed in claim 4 , wherein the electromechanical force component is generated in a second step, the second step carried out after or simultaneously with the first step.

6. The method as claimed in claim 2 , wherein on activation of the parking brake process, the hydraulic service brake is activated in a first step and the automated parking brake is activated in a second step, the second step carried out after or simultaneously with the first step.

7. The method as claimed in claim 2 , wherein an increase in the electromechanical force component is carried out until the total clamping force is reached.

8. The method as claimed in claim 7 , wherein the actuation to achieve the electrohydraulic force component is removed after reaching the total clamping force.

9. The method as claimed in claim 7 , wherein after reaching the total clamping force, the actuation to achieve the electromechanical force component as well as the actuation to achieve the electrohydraulic force component are removed essentially simultaneously.

10. A control unit for carrying out a parking brake process in a motor vehicle that includes a service brake and a parking brake, the control unit comprising:
a device configured to carry out a method for carrying out the parking brake process, the method including:
operating the service brake and the parking brake in a superposition mode,
wherein, in the superposition mode, a hydraulic force component and a mechanical force component are combined to achieve a total clamping force for the parking brake process,
wherein the superposition of the hydraulic force component and the mechanical force component to achieve the total clamping force in the superposition mode is carried out for every parking brake process,
wherein the mechanical force component is generated by an electric motor,
wherein the electric motor is configured to generate a maximum mechanical force that is less than the total clamping force, and
wherein the service brake generates a defined hydraulic pressure to produce the hydraulic force component, and the defined hydraulic pressure is the same for every parking brake process.

11. An automated parking brake for a motor vehicle with a hydraulic service brake, the parking brake comprising:
a device configured to carry out a method for carrying out a parking brake process, the method comprising:
operating the service brake and the parking brake in a superposition mode,
wherein, in the superposition mode, a hydraulic force component and a mechanical force component are combined to achieve a total clamping force for the parking brake process,
wherein the superposition of the hydraulic force component and the mechanical force component to achieve the total clamping force in the superposition mode is carried out for every parking brake process,
wherein the mechanical force component is generated by an electric motor,
wherein the electric motor is configured to generate a maximum mechanical force that is less than the total clamping force, and
wherein the service brake generates a defined hydraulic pressure to produce the hydraulic force component, and the defined hydraulic pressure is the same for every parking brake process.

Assignees

• Bosch Gmbh Robert

Inventors

• Baehrle-Miller Frank
• Blattert Dieter
• Wienken Hubertus

Classifications

• B60T13/588 Primary

  both fluid and mechanical assistance or drive · CPC title

• F16D55/225

  the braking members being brake pads · CPC title

• F16D2121/14

  Mechanical · CPC title

• B60T13/741

  acting on an ultimate actuator · CPC title

• F16D2125/40

  Screw-and-nut · CPC title