EP1697191A1 - Procede de reglage de l'etablissement de pression dans un systeme de freinage a commande electronique - Google Patents

Procede de reglage de l'etablissement de pression dans un systeme de freinage a commande electronique

Info

Publication number
EP1697191A1
EP1697191A1 EP04816346A EP04816346A EP1697191A1 EP 1697191 A1 EP1697191 A1 EP 1697191A1 EP 04816346 A EP04816346 A EP 04816346A EP 04816346 A EP04816346 A EP 04816346A EP 1697191 A1 EP1697191 A1 EP 1697191A1
Authority
EP
European Patent Office
Prior art keywords
pressure
booster
brake
point
determined
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04816346A
Other languages
German (de)
English (en)
Inventor
Ralph Gronau
Tobias Scheller
Ralf Reviol
Andreas Neu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Teves AG and Co OHG
Original Assignee
Continental Teves AG and Co OHG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Continental Teves AG and Co OHG filed Critical Continental Teves AG and Co OHG
Publication of EP1697191A1 publication Critical patent/EP1697191A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/44—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device, i.e. open systems
    • B60T8/441—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device, i.e. open systems using hydraulic boosters
    • B60T8/442—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device, i.e. open systems using hydraulic boosters the booster being a fluid return pump, e.g. in combination with a brake pedal force booster
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • 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
    • B60T13/10—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 with fluid assistance, drive, or release
    • B60T13/12—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 with fluid assistance, drive, or release the fluid being liquid
    • B60T13/16—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 with fluid assistance, drive, or release the fluid being liquid using pumps directly, i.e. without interposition of accumulators or reservoirs
    • B60T13/161—Systems with master cylinder
    • B60T13/162—Master cylinder mechanically coupled with booster
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • 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
    • B60T13/10—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 with fluid assistance, drive, or release
    • B60T13/24—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 with fluid assistance, drive, or release the fluid being gaseous
    • B60T13/46—Vacuum systems
    • B60T13/52—Vacuum systems indirect, i.e. vacuum booster units

Definitions

  • the invention relates to a method for regulating the pressure build-up in an electronically controllable brake system for preferably motor vehicles, with a master brake cylinder, in particular a tandem master brake cylinder (THZ), a vacuum brake booster, at least one further pressure source for brake force support, preferably a hydraulic pump, which is operated by a Control unit can be controlled and the pressure of which wheel brakes of the vehicle can be applied.
  • a master brake cylinder in particular a tandem master brake cylinder (THZ)
  • a vacuum brake booster at least one further pressure source for brake force support, preferably a hydraulic pump, which is operated by a Control unit can be controlled and the pressure of which wheel brakes of the vehicle can be applied.
  • the invention also relates to a device for regulating the pressure build-up in an electronically controllable brake system for preferably motor vehicles, with a master brake cylinder, a vacuum brake booster, at least one further pressure source having a pump, which can be controlled by a control unit and with its pressure wheel brakes of the vehicle are acted upon.
  • the invention also relates to a hydraulic motor vehicle brake system.
  • Vacuum brake boosters require a vacuum supply provided by the engine to support the pedal force to be applied by the driver. Depending on the negative pressure supply, a condition is reached with certain pedal forces in which a further increase in the force on the actuating unit is only possible by an increase in the pedal force, since the Vacuum brake booster has reached the maximum possible support force. The state is called the modulation point of the amplifier.
  • an additional braking force or an additional braking pressure is the use of an "active" hydraulic braking force support. This is e.g. achieved by means of a hydraulic pump.
  • the hydraulic pump also increases the hydraulic pressure in the hydraulic master brake cylinder resulting from the braking force which the driver controls via the brake pedal and which is increased by means of a vacuum brake booster.
  • This pump is driven by an electric motor that is controlled by an electronic brake control unit.
  • EP 0 754 607 AI discloses a brake system with a brake booster and a hydraulic brake control system for vehicles, which can generate a higher pressure than the input pressure.
  • the system is characterized by an evaluation device that detects when the ratio of the auxiliary power to the actuating force falls below (control point of a booster), by a control device that generates a setpoint pressure in the wheel brakes after falling below this ratio by means of the hydraulic brake control system, and by a Desired pressure through which at least partial compensation of the effects of one in relation to the actuating force is available standing assistant.
  • valve switching or pump runs only result in a step-wise pressure increase.
  • the valve circuits and / or pump runs required for active pressure increase can only be carried out when one evaluable control deviation was formed.
  • Actuation speed a shorter time frame is not sufficient to compensate for the increasing pressure in the vacuum chamber due to the reduction in space with the already reduced available vacuum (low engine vacuum). That means the pressure difference across the membrane in the vacuum brake booster is less than the z. B. would be the case with a quasi-stationary gradient. The brake's actuation forces are too high for the driver.
  • a master brake cylinder in particular tandem master brake cylinder (THZ)
  • a vacuum brake booster at least one further pressure source for brake force support, preferably a hydraulic pump, which can be controlled by a control unit and the pressure of which can be applied to the vehicle's wheel brakes, such that an approach to a point of falling below a predetermined ratio of the auxiliary power to the actuating power (modulation point) of the
  • Vacuum brake booster is determined that a pressure gradient in the master brake cylinder (THZ pressure gradient) is determined, and that when a detected approach to the control point of the booster and when a pressure gradient limit value of the determined THZ pressure gradient is exceeded, the further pressure source for brake force support is controlled in order to build up additional brake pressure.
  • THZ pressure gradient a pressure gradient in the master brake cylinder
  • modulation point is defined here in particular by the brake pressure at which the predetermined one Ratio of the assistant to the operating force is fallen below. This also means a “modulation point brake pressure value”.
  • This procedure determines and sets the brake pressure (boost) before a control deviation is formed. If the driver's foot force is increased on the brake pedal (pedal force), the pressure in the system and thus the wheel brake pressure can be increased with a corresponding factor without (noticeable) deceleration. There is no "dull" pedal feeling for the driver. Rather, the comfortable pedal feeling familiar to the driver - as with booster support alone - is almost retained.
  • the pressure gradient limit is in a range from 150 bar / s to 250 bar / s, preferably 190 bar / s to 210 bar / s, in particular approximately 200 bar / s.
  • the further pressure source for braking power assistance is activated when the exceeding of the pressure gradient limit value has been recognized for a predetermined or determined minimum period of time, which is in a range from 10 ms to 100 ms, preferably 20 ms to 40 ms. lies and in particular is approx. 30 ms.
  • a predetermined or calculated, preferably a calculated, control point of the booster is provided a predetermined or determined suitable one
  • Downdraft depressurization value is decreased and so a corrected downdraft point, i. H. a corrected one
  • Control point brake pressure value which is determined at a
  • a pressure in the master brake cylinder (THZ pressure) is determined and used as a guide variable representing a driver specification for a brake pressure control and when the THZ pressure is exceeded via the (pre-shifted) control point or the (according to the invention "advanced") control point brake pressure value and / or the corrected control point of the booster, the further pressure source is controlled in order to build up additional brake pressure.
  • the modulation point of the booster for the brake pressure control is assumed to be constant if, in the course of an ongoing increase in the brake pressure, the modulation point (corrected modulation point) reduced by the modulation point reduction value is reached or fallen below.
  • control point of the booster is continuously calculated and a detected change in the calculated control point of the booster is also taken into account when determining a predetermined or determined suitable control point reduction value.
  • the approach to the modulation point of the booster is determined or estimated in accordance with a stored, calibrated booster characteristic.
  • the control unit Determination and control unit has, for determining an approach to a point of falling below a predetermined ratio of the auxiliary force to the actuating force (modulation
  • At least one hydraulic pump is preferably used as the pump for the further pressure source, alone or in combination with a hydraulic pressure accumulator.
  • the object is also achieved by a hydraulic motor vehicle brake system with an electronic control with a device according to the invention.
  • a motor vehicle has a hydraulic brake system with an electronic control with a device according to the invention.
  • a determined THZ pressure gradient below the control point of the booster is evaluated by means of a brake control unit. The observation of the gradient preferably begins at a THZ pressure greater than 3 bar. If the gradient exceeds the value of preferably about 200 bar / s, and this is at least for a time of z.
  • B. 3 runs of a controller program (controller loop), in this example a time of preferably about 30 ms, the calculated The control point is lowered by a suitable value, advantageously approx. 5 bar, and a corrected control point is determined.
  • the value of the reduction is chosen so that when the THZ pressure, which is the reference variable or the value of the driver's specification, is exceeded via the modulation point, a control (full control) corresponding to the driver's brake specification (his "start") is carried out by those responsible for the active body Pump is guaranteed.
  • control point or control point brake pressure value is kept constant.
  • the non-offset "raw value" of the control point i.e. the control point without the reduction is calculated in the background. If this further determined value of the modulation point increases again by releasing or keeping the brake pedal constant, the corrected, offset-dependent modulation point is also increased further when the actuation point is reached, in order to ensure a harmonious transition when exiting from the regulation of the brake pressure increase by means of the pump.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Regulating Braking Force (AREA)
  • Braking Systems And Boosters (AREA)

Abstract

L'invention concerne un procédé de réglage de l'établissement de pression dans un système de freinage à commande électronique, de préférence dans un véhicule à moteur, comprenant un maître-cylindre, en particulier un maître-cylindre en tandem (THZ), un servofrein à vide (booster), au moins une autre source de pression servant d'assistance de la force de freinage, de préférence une pompe hydraulique, commandée par une unité de commande, et au moyen de laquelle une pression est appliquée sur les freins sur roues. Le procédé selon l'invention est caractérisé en ce qu'on détermine une approximation en un point où l'on n'atteint pas un rapport prédéterminé de la force auxiliaire servant à la force d'actionnement du servofrein à vide (booster) (point de réglage au maximum), en ce qu'on détermine un gradient de pression dans le maître-cylindre (gradient de pression THZ), et en ce que, pour une approximation connue au point de réglage au maximum du surpresseur, et lors du dépassement d'une valeur limite de gradient de pression, par rapport au gradient de pression THZ déterminé, l'autre source de pression servant d'assistance de la force de freinage est commandée, en vue d'établir la pression de freinage supplémentaire.
EP04816346A 2003-12-24 2004-12-17 Procede de reglage de l'etablissement de pression dans un systeme de freinage a commande electronique Withdrawn EP1697191A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10361241 2003-12-24
PCT/EP2004/053584 WO2005063541A1 (fr) 2003-12-24 2004-12-17 Procede de reglage de l'etablissement de pression dans un systeme de freinage a commande electronique

Publications (1)

Publication Number Publication Date
EP1697191A1 true EP1697191A1 (fr) 2006-09-06

Family

ID=34716207

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04816346A Withdrawn EP1697191A1 (fr) 2003-12-24 2004-12-17 Procede de reglage de l'etablissement de pression dans un systeme de freinage a commande electronique

Country Status (5)

Country Link
US (1) US8038228B2 (fr)
EP (1) EP1697191A1 (fr)
JP (1) JP2007516897A (fr)
DE (1) DE112004002497B4 (fr)
WO (1) WO2005063541A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5227293B2 (ja) * 2009-11-30 2013-07-03 トヨタ自動車株式会社 助勢限界認定装置、助勢限界認定方法および助勢限界認定装置を備えた車両用ブレーキシステム
GB2486669A (en) * 2010-12-22 2012-06-27 Land Rover Uk Ltd Brake control to ensure automatic service brake effort does not exceed parking brake effort
US8641152B2 (en) * 2011-11-07 2014-02-04 Ford Global Technologies, Llc Method and system for brake control
WO2015007728A1 (fr) * 2013-07-16 2015-01-22 Ford Global Technologies, Llc Procédé de commande d'un amplificateur de pression de freinage à amplification hydraulique de la pression de freinage et système amplificateur de pression de freinage
DE102013218330A1 (de) * 2013-09-12 2015-03-12 Robert Bosch Gmbh Verfahren zum Betreiben eines Bremskraftverstärkers, Steuergerät zur Durchführung des Verfahrens und ein den Bremskraftverstärker und das Steuergerät umfassendes Bremssystem
DE102019206612B3 (de) * 2019-05-08 2020-07-16 Volkswagen Aktiengesellschaft Verfahren zur Steuerung eines elektromechanischen Bremssystems sowie elektromechanisches Bremssystem

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Publication number Priority date Publication date Assignee Title
DE19525985A1 (de) 1995-07-17 1997-01-23 Bayerische Motoren Werke Ag Bremsanlage für Kraftfahrzeuge mit einem Bremskraftverstärker
JP3752756B2 (ja) * 1996-04-08 2006-03-08 株式会社デンソー 車両用ブレーキ装置
US5938297A (en) * 1996-12-13 1999-08-17 General Motors Corporation Method and device for brake application
DE19756080A1 (de) * 1997-12-17 1999-07-01 Bosch Gmbh Robert Bremsdruck-Steuereinrichtung, insbesondere für ein Straßenfahrzeug
WO1999038741A1 (fr) * 1998-01-31 1999-08-05 Continental Teves Ag & Co. Ohg Dispositif de transmission de force de freinage, notamment pour vehicules a moteur
DE19825110C1 (de) 1998-06-05 2000-02-03 Lucas Automotive Gmbh Bremsdruckgebervorrichtung für eine hydraulische Fahrzeugbremsanlage
DE19925794B4 (de) * 1999-06-05 2013-04-04 Robert Bosch Gmbh Bremsdruck-Steuereinrichtung und Verfahren zur Aktivierung und Deaktivierung einer hydraulischen Bremskraftverstärkung
DE19925783A1 (de) 1999-06-05 2000-12-07 Bosch Gmbh Robert Verfahren und Vorrichtung zur Bremskraftverstärkung bei einem Fahrzeug
DE10022957A1 (de) 2000-05-11 2001-11-15 Bosch Gmbh Robert Verfahren und Vorrichtung zur Steuerung wenigstens einer Radbremse eines Fahrzeugs
DE10156401A1 (de) 2001-01-24 2002-08-01 Continental Teves Ag & Co Ohg Verfahren und Vorrichtung zur Regelung des Druckaufbaus in einer elektronisch regelbaren Bremsanlage
FR2829451B1 (fr) * 2001-09-11 2003-12-19 Bosch Gmbh Robert Procede de calibrage d'un servomoteur d'assistance pneumatique pour un circuit de freinage de vehicule automobile
WO2003066405A1 (fr) * 2002-02-07 2003-08-14 Continental Teves Ag & Co.Ohg Procede pour determiner ou etalonner la courbe caracteristique de reglage d'un servofrein a depression

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2005063541A1 *

Also Published As

Publication number Publication date
WO2005063541A1 (fr) 2005-07-14
DE112004002497B4 (de) 2022-08-25
US20070164605A1 (en) 2007-07-19
US8038228B2 (en) 2011-10-18
JP2007516897A (ja) 2007-06-28
DE112004002497D2 (de) 2006-12-14

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