Method for ascertaining a pressure-volume characteristic of a braking system of a vehicle, and evaluation and/or control apparatus for at least one braking system component of a braking system of a vehicle

Patent metadata

Field	Value
Publication number	US-2016272174-A1
Application number	US-201615059422-A
Country	US
Kind code	A1
Filing date	Mar 3, 2016
Priority date	Mar 17, 2015
Publication date	Sep 22, 2016
Grant date	—

Abstract

A method for ascertaining a pressure-volume characteristic of a braking system of a vehicle, including determining at least a first pressure-volume value pair from a first pressure occurring in the braking system during a pressure rise and from a first volume displaced in order to produce the first pressure, a second pressure-volume value pair for a second pressure higher than the first pressure or for a second volume greater than the first volume being derived in consideration at least of the first pressure-volume value pair and of a volume difference for the first pressure and the second pressure, stored in the predefined pressure-volume characteristic curve, between a first volume indication associated with the first pressure and a second volume indication associated with the second pressure, or of a stored pressure difference for the first volume and the second volume between a first pressure indication associated with the first volume and a second pressure indication associated with the second volume.

First claim

What is claimed is:

1 . A method for ascertaining a pressure-volume characteristic of a braking system of a vehicle, comprising:
(S 1 ) determining at least a first pressure-volume value pair from a first pressure occurring in the braking system during a pressure rise and from a first volume displaced to produce the first pressure; and (S 2 ) deriving a second pressure-volume value pair for a second pressure higher than the first pressure or for a second volume greater than the first volume, in consideration at least of the first pressure-volume value pair and of a volume difference for the first pressure and the second pressure, stored in the predefined pressure-volume characteristic curve, between a first volume indication associated with the first pressure and a second volume indication associated with the second pressure, or of a stored pressure difference for the first volume and the second volume between a first pressure indication associated with the first volume and a second pressure indication associated with the second volume.

2 . The method as recited in claim 1 , further comprising one of:
(S 3 - 1 ) determining an adapted volume difference for the first pressure and the second pressure in consideration of the stored volume difference for the first pressure and the second pressure, of a difference between the first volume indication and the first volume, and of a difference between the second volume indication and a volume value of the derived second pressure-volume value pair; or (S 4 - 1 ) determining an adapted pressure difference for the first volume and the second volume in consideration of the stored pressure difference for the first volume and the second volume, of a difference between the first pressure indication and the first pressure, and of a difference between the second pressure indication and a pressure value of the derived second pressure-volume value pair.

3 . The method as recited in claim 2 , wherein one of:
(S 4 - 1 ) the volume value of the derived second pressure-volume pair is redefined in consideration of the adapted volume difference, or (S 4 - 2 ) the pressure value of the derived second pressure-volume value pair is redefined in consideration of the adapted pressure difference.

4 . The method as recited in claim 3 , wherein the predefined pressure-volume characteristic curve is adapted to a current state of the braking system by the fact that at least some of the method steps S 1 , S 2 , S 3 - 1 , S 3 - 2 , S 4 - 1 , and S 4 - 2 are respectively executed for at least some pressures of a predefined series of pressures.

5 . The method as recited in claim 4 , wherein after a cornering operation, only the method steps S 1 and S 2 for adapting the predefined pressure-volume characteristic curve are respectively executed for at least some pressures of the predefined series.

6 . The method as recited in claim 5 , wherein after a cornering operation, at least some of the method steps S 1 , S 2 , S 3 - 1 , S 3 - 2 , S 4 - 1 , and S 4 - 2 for adapting the predefined pressure-volume characteristic curve are respectively executed only for pressures of the predefined series below a predefined threshold value less than a maximum of the predefined series.

7 . The method as recited in claim 6 , wherein the method steps S 1 , S 2 , S 3 - 1 , and S 4 - 1 , or the method steps S 1 , S 2 , S 3 - 2 , and S 4 - 2 , for adapting the predefined pressure-volume characteristic curve, are respectively repeated for an entire predefined series of pressures at least one of after a predefined driving time, after a predefined driving distance, and after a predefined time interval.

8 . An evaluation or control apparatus for at least one braking system component of a braking system of a vehicle, comprising:
a storage device on which a pressure-volume characteristic curve is stored; and a computer device that is designed to receive at least one furnished first pressure-volume value pair made up of a first pressure occurring during a pressure rise in the braking system and of a first volume displaced in order to produce the first pressure, and a second pressure-volume value pair for a second pressure higher than the first pressure or for a second volume greater than the first volume, in consideration at least of the first pressure-volume value pair and of a volume difference for the first pressure and the second pressure, stored in the predefined pressure-volume characteristic curve, between a first volume indication associated with the first pressure and a second volume indication associated with the second pressure, or of a stored pressure difference for the first volume and the second volume between a first pressure indication associated with the first volume and a second pressure indication associated with the second volume; wherein at least one of: i) an information item inferred from at least the second pressure-volume value pair, and ii) a control signal defined in consideration at least of the second pressure-volume value pair, being outputtable.

9 . A brake booster for a braking system of a vehicle, including an evaluation or control apparatus, comprising:
a storage device on which a pressure-volume characteristic curve is stored; and a computer device that is designed to receive at least one furnished first pressure-volume value pair made up of a first pressure occurring during a pressure rise in the braking system and of a first volume displaced in order to produce the first pressure, and a second pressure-volume value pair for a second pressure higher than the first pressure or for a second volume greater than the first volume, in consideration at least of the first pressure-volume value pair and of a volume difference for the first pressure and the second pressure, stored in the predefined pressure-volume characteristic curve, between a first volume indication associated with the first pressure and a second volume indication associated with the second pressure, or of a stored pressure difference for the first volume and the second volume between a first pressure indication associated with the first volume and a second pressure indication associated with the second volume; wherein at least one of: i) an information item inferred from at least the second pressure-volume value pair, and ii) a control signal defined in consideration at least of the second pressure-volume value pair, being outputtable.

10 . A hydraulic assemblage control device for a braking system of a vehicle, including an evaluation or control apparatus, comprising:
a storage device on which a pressure-volume characteristic curve is stored; and a computer device that is designed to receive at least one furnished first pressure-volume value pair made up of a first pressure occurring during a pressure rise in the braking system and of a first volume displaced in order to produce the first pressure, and a second pressure-volume value pair for a second pressure higher than the first pressure or for a second volume greater than the first volume, in consideration at least of the first pressure-volume value pair and of a volume difference for the first pressure and the second pressure, stored in the predefined pressure-volume characteristic curve, between a first volume indication associated with the first pressure and a second volume indication associated with the second pressure, or of a stored pressure difference for the first volume and the second volume between a first pressure indication associated with the first volume and a second pressure indication associated with the second volume; wherein at least one of: i) an information item inferred from at least the second pressure-volume value pair, and ii) a control sig

Assignees

• Bosch Gmbh Robert

Inventors

• Stelter Friedrich

Classifications

• B60T2270/406

  Test-mode; Self-diagnosis · CPC title

• B60T2270/14

  hydraulic model · CPC title

• B60T17/22

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

• B60T8/885 Primary

  using electrical circuitry · CPC title

• B60T13/662

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