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

Patent metadata

Field	Value
Publication number	US-9937909-B2
Application number	US-201415104874-A
Country	US
Kind code	B2
Filing date	Oct 29, 2014
Priority date	Dec 20, 2013
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

A method for operating a brake system in a motor vehicle, having at least one hydraulic circuit that has a hydraulic pump and at least two wheel brakes, at least one actuatable inlet valve being allocated to each wheel brake. The brake system is monitored for a driver's braking request. To acquire the driver's braking request, a first wheel behavior of at least one wheel allocated to one of the wheel brakes is acquired, such that, upon acquiring of an unexpected wheel behavior, the braking intervention is interrupted and a second wheel behavior of the wheel is acquired and compared to the first wheel behavior of the wheel, and the driver's braking request is recognized as a function of the comparison.

First claim

What is claimed is:

1. A method for operating a brake system of a motor vehicle, the brake system including at least one hydraulic circuit that has a hydraulic pump and at least two wheel brakes, at least one actuatable inlet valve being allocated to each wheel brake, in which, for an automatic braking intervention, a pressure is produced in the hydraulic circuit by the hydraulic pump and the inlet valve of a first of the wheel brakes is opened and the inlet valve of a second of the wheel brakes of the same hydraulic circuit is closed, the method comprising:
monitoring the brake system during the automatic braking intervention in order to detect if a driver's braking request is initiated during the automatic braking intervention, wherein to detect the driver's braking request, performing:
acquiring during the automatic braking intervention a first wheel behavior of at least one wheel allocated to one of the wheel brakes; and
upon determining that the first wheel behavior is unexpected:
implementing a temporary interruption of the automatic braking intervention,
during the temporary interruption of the automatic braking intervention, acquiring a second wheel behavior of the wheel,
during the temporary interruption of the automatic braking intervention,

comparing the second wheel behavior to the first wheel behavior of the wheel, and
if the comparison indicates that the driver's braking request has not been implemented, restoring the automatic braking intervention after ending the temporary interruption.

2. The method as recited in claim 1 , wherein if the comparison yields the result that the second wheel behavior corresponds at least substantially to the first wheel behavior, adapting a brake pressure modulation and continuing as a function of the acquired second wheel behavior.

3. The method as recited in claim 1 , wherein the comparison indicates that the driver's braking request has not been implemented, if the comparison yields the result that the second wheel behavior differs from the first wheel behavior.

4. A brake system for a motor vehicle, comprising:
at least one hydraulic circuit that has a hydraulic pump and at least two wheel brakes, at least one actuatable inlet valve being allocated to each wheel brake, and having an arrangement for acquiring a driver's braking request, wherein the brake system is fashioned without a pressure sensor, and the arrangement includes a control device that monitors the brake system during an automatic braking intervention in order to detect if a driver's braking request is initiated during the automatic braking intervention, wherein to acquire the driver's braking request, the control device:
acquires during the automatic braking intervention a first wheel behavior of at least one wheel allocated to one of the wheel brakes, and
upon determining that the first wheel behavior is unexpected:
implements a temporary interruption of the automatic braking intervention,
during the temporary interruption of the automatic braking intervention, acquires a second wheel behavior of the wheel,
during the temporary interruption of the automatic braking intervention, compares the second wheel behavior to the first wheel behavior of the wheel, and
if the comparison indicates that the driver's braking request has not been implemented, restores the automatic braking intervention after ending the temporary interruption.

Assignees

• Bosch Gmbh Robert

Inventors

• Glaser Markus
• Eisele Achim
• Kranich Matthias

Classifications

• B60T2270/304

  during driver brake actuation · CPC title

• B60T2270/413

  Plausibility monitoring, cross check, redundancy · CPC title

• B60T8/17555 Primary

  specially adapted for enhancing driver or passenger comfort, e.g. soft intervention or pre-actuation strategies · CPC title

• B60T13/00

  Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems (arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions B60T8/00; valves incorporated in such systems B60T15/00) · CPC title

• B60T8/1755

  Brake regulation specially adapted to control the stability of the vehicle, e.g. taking into account yaw rate or transverse acceleration in a curve (road vehicle drive control systems for control of driving stability otherwise than by controlling a particular sub-unit B60W30/02) · CPC title