Method for determining a likely internal pressure for a master brake cylinder and device for determining a likely internal pressure for a master brake cylinder

Patent metadata

Field	Value
Publication number	US-2016137175-A1
Application number	US-201414900930-A
Country	US
Kind code	A1
Filing date	Jun 12, 2014
Priority date	Jun 26, 2013
Publication date	May 19, 2016
Grant date	—

Abstract

A method for determining a likely internal pressure for a master brake cylinder including: estimating/measuring a displacement path(s) of a brake input element configured on a master cylinder from initial position thereof; estimating/measuring a first hydraulic fluid volumetric flow rate of a hydraulic fluid of the braking system out of or into a first pressure chamber of the master cylinder, and of a second hydraulic fluid volumetric flow rate of the hydraulic fluid out of or into a second pressure chamber of the master cylinder; and determining the likely internal pressure for a master cylinder considering the estimated/measured displacement path(s), the estimated and/or measured first hydraulic fluid volumetric flow rate, and the estimated and/or measured second hydraulic fluid volumetric flow rate. Also described is a device for determining a likely internal pressure for a master brake cylinder, and an electromechanical brake booster, ESP control, and vehicle braking system.

First claim

1 - 13 . (canceled)

14 . A method for determining a likely internal pressure for a master brake cylinder, the method comprising:
estimating and/or measuring a displacement path(s) of a brake input element on a master brake cylinder from an initial position thereof; estimating and/or measuring a first hydraulic fluid volumetric flow rate of a hydraulic fluid of the braking system out of or into a first pressure chamber of the master brake cylinder, and of a second hydraulic fluid volumetric flow rate of the hydraulic fluid out of or into a second pressure chamber of the master brake cylinder; and determining the likely internal pressure for a master brake cylinder at least taking into account the estimated and/or measured displacement path(s), the estimated and/or measured first hydraulic fluid volumetric flow rate, and the estimated and/or measured second hydraulic fluid volumetric flow rate.

15 . The method of claim 14 , wherein the likely internal pressure for a master brake cylinder being determined while additionally taking into account at least one measured master brake cylinder pressure value and/or at least one measured admission pressure.

16 . The method of claim 14 , wherein the likely internal pressure for a master brake cylinder being determined while additionally taking into account a compression module of the hydraulic fluid, an output volume of the master brake cylinder if brake input element is in the initial position thereof, an inner diameter of the master brake cylinder and/or a cross-sectional area of the master brake cylinder.

17 . The method of claim 16 , wherein to determine the likely internal pressure for a master brake cylinder, a rate of pressure change being continuously determined where:



p
MC


t

=

k

V
0

-

π
·

d
2

4

·
s

·

(

q

MC



1

+

q

MC



2

+

π
·

d
2

4

·


s


t

)

,

ds/dt being an estimated or measured rate of change of displacement path(s) of brake input element and/or an estimated or measured adjustment speed of the brake input element.

18 . The method of claim 16 , wherein to determine the likely internal pressure for a master brake cylinder, the rate of pressure change being continuously determined where:



p
MC


t

=

k

V
0

-

A
·
s

·

(

q

MC



1

+

q

MC



2

+

A
·


s


t

)

,

ds/dt being the estimated or measured rate of change of the displacement path(s) of the brake input element and/or the estimated or measured adjustment speed of the brake input element.

19 . The method of claim 17 , wherein the likely internal pressure for a master brake cylinder being determined as the integral over the rate of pressure change where:

p
MC



(
t
)

=

p
MC



(

t
0

)

Assignees

• Bosch Gmbh Robert

Inventors

• Bunk Michael

Classifications

• B60T8/17551 Primary

  determining control parameters related to vehicle stability used in the regulation, e.g. by calculations involving measured or detected parameters · CPC title

• B60T8/175

  Brake regulation specially adapted to prevent excessive wheel spin during vehicle acceleration, e.g. for traction control (safety devices for propulsion unit control responsive to, or preventing, skidding of wheels B60K28/16) · CPC title

• B60T13/146

  Part of the system directly actuated by booster pressure · CPC title

• B60T2270/86

  Optimizing braking by using ESP vehicle or tyre model · CPC title

• B60T8/4291

  having means to reduce or eliminate pedal kick-back · CPC title