Method for operating a brake system of a motor vehicle, and brake system

Patent metadata

Field	Value
Publication number	US-10703347-B2
Application number	US-201716072949-A
Country	US
Kind code	B2
Filing date	Feb 20, 2017
Priority date	Feb 26, 2016
Publication date	Jul 7, 2020
Grant date	Jul 7, 2020

Abstract

A method for operating a brake installation of a vehicle. A first electrically controllable pressure provision device provides brake pressure for actuating hydraulically actuatable brakes. A first electronic open-loop and closed-loop control unit, and a first pressure detection device, measures brake pressure provided by a primary brake system. A secondary brake system between the primary system and a part of the wheel brakes has a second electrically controllable pressure provision device provides brake pressure for actuating at least the part of the brakes. A second electronic open-loop and closed-loop control unit, and at least one second pressure detection device, the signals of which are processed in the second electronic open-loop and closed-loop control unit. The secondary system monitors the primary system based on signals from the second pressure detection device and on a predefined brake pressure demand to build up a brake pressure corresponding to the predefined brake pressure demand.

First claim

The invention claimed is:

1. A method for operating a brake installation of a motor vehicle including:
a primary brake system comprising:
a first electrically controllable pressure provision device for providing a brake pressure for actuating hydraulically actuatable wheel brakes,
a first electronic open-loop and closed-loop control unit, and
a first pressure detection device, which measures a brake pressure provided by the primary brake system, and
a secondary brake system comprising:
a second electrically controllable pressure provision device for providing a brake pressure for actuating at least a part of the hydraulically actuatable wheel brakes,
a second electronic open-loop and closed-loop control unit, and
at least one second pressure detection device, the signals of which are processed in the second electronic open-loop and closed-loop control unit,
wherein the secondary brake system is arranged hydraulically between the primary brake system and the part of the wheel brakes,
the method comprising:
detecting a pressure with the at least one second pressure detection device;
transmitting from the first electronic open-loop and closed-loop control unit of the primary brake system, to the second electronic open-loop and closed-loop control unit of the secondary brake system, a signal regarding whether or not a brake pressure control function in the primary brake system is active; and
monitoring, with the secondary brake system, the primary brake system on the basis of (i) the signals of the second pressure detection device generated based on the detected pressure; (ii) the predefined brake pressure demand; and (iii) the signal regarding whether or not the brake pressure control function in the primary brake system is active, in order to determine a functional capability of the primary brake system to build up a brake pressure corresponding to the predefined brake pressure demand.

2. The method as claimed in claim 1 , wherein, for the monitoring, the signals of the second pressure detection device are compared with the predefined brake pressure demand.

3. The method as claimed in claim 1 , wherein the brake pressure demand is supplied or available to the first electronic open-loop and closed-loop control unit of the primary brake system and to the second electronic open-loop and closed-loop control unit of the secondary brake system.

4. The method as claimed in claim 1 , wherein the brake pressure demand is predefined by a control device.

5. The method as claimed in claim 4 , wherein the control device is connected to the first electronic open-loop and closed-loop control unit via a first signal connection, and the control device is connected to the second electronic open-loop and closed-loop control unit via a second signal connection.

6. The method as claimed in claim 4 , wherein the control device is connected to the first electronic open-loop and closed-loop control unit via a first data bus, and the control device is connected to the second electronic open-loop and closed-loop control unit via a second data bus.

7. The method as claimed in claim 1 , wherein the brake pressure control function is a function which permits an undershooting of the predefined brake pressure demand.

8. The method as claimed in claim 1 , wherein an actuation of the part of the wheel brakes is performed by the second pressure provision device of the secondary brake system if the primary brake system, over a predefined time period, does not provide a brake pressure corresponding to the predefined brake pressure demand.

9. The method as claimed in claim 1 , wherein the second pressure detection device detects an inlet pressure of the secondary brake system.

10. The method as claimed in claim 1 , wherein the second pressure detection device detects an outlet pressure of the secondary brake system.

11. The method as claimed in claim 1 , wherein the brake pressure demand is predefined by an autopilot function.

12. The method as claimed in claim 1 , wherein the second pressure detection device detects a wheel brake pressure of the secondary brake system.

13. A brake installation for a motor vehicle comprising:
a primary brake system comprising:
a first electrically controllable pressure provision device for providing a brake pressure for actuating hydraulically actuatable wheel brakes,
a first electronic open-loop and closed-loop control unit, and
a first pressure detection device, which measures a brake pressure provided by the primary brake system, and
a secondary brake system comprising:
a second electrically controllable pressure provision device ( 4 ) for providing a brake pressure for actuating at least a part of the hydraulically actuatable wheel brakes,
a second electronic open-loop and closed-loop control unit, and
at least one second pressure detection device, the signals of which are processed in the second electronic open-loop and closed-loop control unit,
wherein the secondary brake system is arranged hydraulically between the primary brake system and the part of the wheel brakes,
wherein the first electronic open-loop and closed-loop control unit is configured to transmit a signal regarding whether or not a brake pressure control function in the primary brake system is active to the second electronic open-loop and closed-loop control unit,
wherein the second electronic open-loop and closed-loop control unit is configured to monitor, on the basis of (i) the signals of the second pressure detection device generated based on detected pressure; (ii) a predefined brake pressure demand; and (iii) the signal regarding whether or not the brake pressure control function in the primary brake system is active, in order to determine a functional capability of the primary brake system to build up a brake pressure corresponding to a predefined brake pressure demand.

14. A brake installation for a motor vehicle comprising:
a primary brake system comprising:
a first electrically controllable pressure provision device for providing a brake pressure for actuating hydraulically actuatable wheel brakes,
a first electronic open-loop and closed-loop control unit, and
a first pressure detection device, which measures a brake pressure provided by the primary brake system; and
a secondary brake system comprising:
a second electrically controllable pressure provision device for providing a brake pressure for actuating at least a part of the hydraulically actuatable wheel brakes),
a second electronic open-loop and closed-loop control unit, and
at least one second pressure detection device, the signals of which are processed in the second electronic open-loop and closed-loop control unit,
wherein the secondary brake system is arranged hydraulically between the primary brake system and the part of the wheel brakes,
wherein the first electronic open-loop and closed-loop control unit is configured to transmit a signal regarding whether or not a brake pressure control function in the primary brake system is active to the second electronic open-loop and closed-loop control unit,
wherein the second electronic open-loop and closed-loop control unit is configured to monitor, on the basis of (i) the signals of the second pressure detection device generated based on detected pressure; (ii) a predefined brake pressure demand; and (iii) the signal regarding whether or not the brake pressure control function in the primary brake system is active, in order to determine a functional capability of the primary brake system to build up a brake pressure corresponding to a predefined brake pressure demand, and
wherein for the monitoring, the second elec

Assignees

• Continental Teves Ag & Co Ohg

Inventors

• Besier Marco
• Roll Georg
• Gröger Sascha
• Neu Andreas
• Hoffmann Cristiano
• Linhoff Paul

Classifications

• B60T8/4072

  Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking · CPC title

• B60T8/321 Primary

  deceleration (B60T8/34, B60T8/52, B60T8/54, B60T8/56, B60T8/58, B60T8/72, B60T8/86, B60T8/88 take precedence) · CPC title

• B60Y2400/81

  Braking systems · CPC title

• B60T17/18 Primary

  Safety devices; Monitoring · CPC title

• B60T8/4081

  Systems with stroke simulating devices for driver input (B60T8/4077 takes precedence) · CPC title