Method and device for controlling a hydraulic brake system

Patent metadata

Field	Value
Publication number	US-10988128-B2
Application number	US-201916415122-A
Country	US
Kind code	B2
Filing date	May 17, 2019
Priority date	May 30, 2018
Publication date	Apr 27, 2021
Grant date	Apr 27, 2021

Abstract

In a hydraulic brake system, which includes: a hydraulic pump which is driven by an electric motor and has the purpose of generating a fluid volume flow for the hydraulic brake system; and a solenoid valve for controlling the fluid volume flow from the hydraulic pump to a wheel brake, a method includes actuating the solenoid valve in such a way that by this means a fluid pulsation at the wheel brake is counteracted. Furthermore, the method may be implemented in a corresponding device.

First claim

The invention claimed is:

1. A method for controlling a hydraulic brake system, said hydraulic brake system including a hydraulic pump which is driven by an electric motor and generates a fluid volume flow for the hydraulic brake system, and a solenoid valve that controls the fluid volume flow from the hydraulic pump to a wheel brake, the method comprising:
actuating the solenoid valve in such a way that a fluid pulsation at the wheel brake is counteracted by:
defining, with a control unit of the hydraulic brake system, the fluid volume flow of the hydraulic pump as a function of a rotational angle of the hydraulic pump or a rotor position of the electric motor;
determining, with the control unit, based on the defined fluid volume flow, a desired pressure difference between the hydraulic pump and the wheel brake that is necessary to smooth the fluid pulsation;

determining, with the control unit, a required control flow through the solenoid valve to achieve the desired pressure difference based on a throttle effect which is caused by a degree of opening of the solenoid valve; and
actuating, with the control unit, the solenoid valve with the degree of opening to achieve the determined required control flow.

2. The method according to claim 1 , wherein the actuating of the solenoid valve includes actuating the solenoid valve so as to adjust a chronologically varying hydraulic resistance in the fluid volume flow from the hydraulic pump to the wheel brake.

3. The method according to claim 1 , wherein the actuating of the solenoid valve includes periodically varying the degree of opening of the solenoid valve.

4. The method according to on claim 1 , wherein the actuating of the solenoid valve includes varying the degree of opening of the solenoid valve during one revolution of the electric motor.

5. The method according to claim 1 , wherein the actuating of the solenoid valve includes taking into account a pump setting.

6. A control unit of a hydraulic brake system that includes a hydraulic pump which is driven by an electric motor and generates a fluid volume flow for the hydraulic brake system, and a solenoid valve that controls the fluid volume flow from the hydraulic pump to a wheel brake, said control unit comprising a processor configured to execute program instructions stored in a memory to:
actuate the solenoid valve in such a way that a fluid pulsation at the wheel brake is counteracted by:
defining the fluid volume flow of the hydraulic pump as a function of a rotational angle of the hydraulic pump or a rotor position of the electric motor;
determining, based on the defined fluid volume flow, a desired pressure difference between the hydraulic pump and the wheel brake that is necessary to smooth the fluid pulsation;
determining a required control flow through the solenoid valve to achieve the desired pressure difference based on a throttle effect which is caused by a degree of opening of the solenoid valve; and
actuating the solenoid valve with the degree of opening to achieve the determined required control flow.

7. A hydraulic brake system comprising:
an electric motor;
a hydraulic pump driven by the electric motor so as to generate a fluid volume flow for the hydraulic brake system,
a wheel brake; and
a solenoid valve that controls the fluid volume flow from the hydraulic pump to the wheel brake; and
a control unit configured to actuate the solenoid valve in such a way that a fluid pulsation at the wheel brake is counteracted by:
defining the fluid volume flow of the hydraulic pump as a function of a rotational angle of the hydraulic pump or a rotor position of the electric motor;
determining, based on the defined fluid volume flow, a desired pressure difference between the hydraulic pump and the wheel brake that is necessary to smooth the fluid pulsation;
determining a required control flow through the solenoid valve to achieve the desired pressure difference based on a throttle effect which is caused by a degree of opening of the solenoid valve; and
actuating the solenoid valve with the degree of opening to achieve the determined required control flow,

wherein the brake system does not include a static throttle in order to smooth a fluid pulsation at the wheel brake.

Assignees

• Bosch Gmbh Robert

Inventors

• Emde Christoph
• Druckenmueller Heiko
• Kurz Holger
• Schellnegger Patrick
• Navruz Yakup
• Schmidtlein Andreas

Classifications

• B60T13/662

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

• B60T8/4068

  the additional fluid circuit comprising means for attenuating pressure pulsations · CPC title

• B60T13/686 Primary

  in hydraulic systems or parts thereof · CPC title

• B60T8/173

  Eliminating or reducing the effect of unwanted signals, e.g. due to vibrations or electrical noise · CPC title

• B60T17/22

  Devices for monitoring or checking brake systems; Signal devices · CPC title