Method for operating a brake system, and brake system

Patent metadata

Field	Value
Publication number	US-11752991-B2
Application number	US-201917259878-A
Country	US
Kind code	B2
Filing date	Jun 22, 2019
Priority date	Aug 13, 2018
Publication date	Sep 12, 2023
Grant date	Sep 12, 2023

Abstract

A method for operating a brake system of a vehicle. A precontrol value for a brake pressure of the brake system is set by using an admission pressure value representing a admission pressure in the brake system and a processing specification representing a braking dynamics of the vehicle.

First claim

What is claimed is:

1. A method for operating a brake system of a vehicle, comprising:
obtaining, by the brake system, input of a brake pressure request;
determining an admission pressure gradient of admission pressure values of the brake pressure request;
prior to a braking force on wheels of the vehicle exceeding a static friction of the wheels on a subsurface of the wheels and in response to the determined admission pressure gradient being greater than a predefined gradient, setting precontrol values such that a brake precontrol gradient of the precontrol values is lower than the determined admission pressure gradient, wherein the setting of the precontrol values is performed using as input (a) the admission pressure values and (b) a processing specification representing a braking dynamics of the vehicle; and
controlling valves in a manner that changes brake pressures at the wheels according to the set precontrol values.

2. The method as recited in claim 1 , wherein the precontrol value is set per axle of the vehicle.

3. The method as recited in claim 1 , wherein the processing specification is a predefined vehicle-specific normal force curve model that models how a normal force against each of the wheels is expected to cyclically change over time during and due to a braking operation of the vehicle.

4. The method as recited in claim 1 , wherein the processing specification is a predefined vehicle-specific pitching dynamics model that models how a pitch of the vehicle is expected to cyclically change over time during and due to a braking operation of the vehicle.

5. The method as recited in claim 1 , wherein the controlling of the valves is further based on derivatives of wheel speeds of the wheels.

6. The method as recited in claim 5 , wherein the controlling is performed over a period that includes an initial brake application time and a subsequent brake application time, and the controlling is performed in the initial brake time in accordance with the set precontrol values and in the subsequent brake application time in accordance with a combination of the set precontrol values and the derivatives of the wheel speeds.

7. The method as recited in claim 5 , wherein the controlling is performed in such a way that the wheel speed is reduced within a slip corridor.

8. A brake system for a vehicle configured to:
obtain input of a brake pressure request;
determine an admission pressure gradient of admission pressure values of the brake pressure request;
prior to a braking force on wheels of the vehicle exceeding a static friction of the wheels on a subsurface of the wheels and in response to the determined admission pressure gradient being greater than a predefined gradient, set precontrol values such that a brake precontrol gradient of the precontrol values is lower than the determined admission pressure gradient, wherein the setting of the precontrol values is performed using as input (a) the admission pressure values and (b) a processing specification representing a braking dynamics of the vehicle; and
control valves in a manner that changes brake pressures at the wheels according to the set precontrol values.

9. A non-transitory machine-readable storage medium on which is stored a computer program for operating a brake system of a vehicle, the computer program, when executed by a computer, causing the computer to perform a method, the method comprising:
obtaining input of a brake pressure request;
determining an admission pressure gradient of admission pressure values of the brake pressure request;
prior to a braking force on wheels of the vehicle exceeding a static friction of the wheels on a subsurface of the wheels and in response to the determined admission pressure gradient being greater than a predefined gradient, setting precontrol values such that a brake precontrol gradient of the precontrol values is lower than the determined admission pressure gradient, wherein the setting of the precontrol values is performed using as input (a) the admission pressure values and (b) a processing specification representing a braking dynamics of the vehicle; and
controlling valves in a manner that changes brake pressures at the wheels according to the set precontrol values.

10. A method for operating a brake system of a vehicle, comprising:
setting a precontrol value for a brake pressure of the brake system using (a) an admission pressure value representing an admission pressure in the brake system and (b) a processing specification representing; and
controlling valves in a manner that changes brake pressures at the wheels according to the set precontrol values;
wherein the processing specification is:
(a) a predefined vehicle-specific normal force curve model that models how a normal force against each of the wheels is expected to cyclically change over time during and due to a braking operation of the vehicle; or
(b) a predefined vehicle-specific pitching dynamics model that models how a pitch of the vehicle is expected to cyclically change over time during and due to a braking operation of the vehicle.

11. The method as recited in claim 10 , wherein the processing specification is the predefined vehicle-specific normal force curve model.

12. The method as recited in claim 10 , wherein the processing specification is the predefined vehicle-specific pitching dynamics model.

Assignees

• Bosch Gmbh Robert

Inventors

• Eisele Achim
• Klug Andreas
• Zoebele Andreas
• Becker Jan
• Kranich Matthias
• Weingart Philipp
• Poggenburg Ruediger

Classifications

• B60T8/1766 Primary

  Proportioning of brake forces according to vehicle axle loads, e.g. front to rear of vehicle · CPC title

• B60T8/17616 Primary

  Microprocessor-based systems · CPC title

• B60T8/172

  Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters {(B60T8/17551 takes precedence)} · CPC title

• B60T8/321

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

• B60T2201/12

  Pre-actuation of braking systems without significant braking effect; Optimizing brake performance by reduction of play between brake pads and brake disc · CPC title