WO2006032658A1 - Procede et systeme pour assister un dispositif de freinage en cas de baisse d'efficacite du systeme de freinage du vehicule - Google Patents

Procede et systeme pour assister un dispositif de freinage en cas de baisse d'efficacite du systeme de freinage du vehicule Download PDF

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Publication number
WO2006032658A1
WO2006032658A1 PCT/EP2005/054686 EP2005054686W WO2006032658A1 WO 2006032658 A1 WO2006032658 A1 WO 2006032658A1 EP 2005054686 W EP2005054686 W EP 2005054686W WO 2006032658 A1 WO2006032658 A1 WO 2006032658A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
brake
value
fbs
brake pressure
Prior art date
Application number
PCT/EP2005/054686
Other languages
German (de)
English (en)
Inventor
Thomas Kuzel
Bernd Ummer
Holger Esslinger
Original Assignee
Continental Teves Ag & 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 & Co. Ohg filed Critical Continental Teves Ag & Co. Ohg
Priority to DE112005002239T priority Critical patent/DE112005002239A5/de
Publication of WO2006032658A1 publication Critical patent/WO2006032658A1/fr

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
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/18—Safety devices; Monitoring
    • B60T17/22—Devices for monitoring or checking brake systems; Signal devices
    • B60T17/221—Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems
    • 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
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/662—Electrical control in fluid-pressure brake systems characterised by specified functions of the control system components
    • 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
    • B60T8/48—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 connecting the brake actuator to an alternative or additional source of fluid pressure, e.g. traction control systems
    • B60T8/4809—Traction control, stability control, using both the wheel brakes and other automatic braking systems
    • B60T8/4827—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems
    • B60T8/4863—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems
    • B60T8/4872—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems pump-back systems

Definitions

  • the invention relates to a method for increasing the Bremswir ⁇ effect in a motor vehicle with a hydraulic Bremsan ⁇ situation in which by switching on a Energymakerss ⁇ unit a brake pressure in at least one wheel brake is increased up to a pressure limit when a brake pressure (within a master cylinder ) exceeds an activation threshold determined as a function of a vehicle deceleration.
  • the invention further relates to a device suitable for carrying out the method.
  • Hydraulic brake systems have a limited effectiveness at high thermal loading, at the influence of saline solution or oil and at high wear, so that the brake system is not sufficient even with a high pressure set by the driver within the master brake cylinder Delay the vehicle causes.
  • the reduction of the braking effect at high operating temperatures of the brake system is also referred to as fading.
  • German patent application DE 102 38 427 A1 already discloses a method of the type mentioned above in which, in the case of limited effectiveness of the vehicle brake, the brake pressure or the braking force in the wheel brakes is increased by connecting an energy source. Such a method is also referred to as FBS function (FBS: Modeling Brake Support).
  • the brake pressure in the wheel brakes is increased in the known method until a pressure limit is reached which corresponds to the opening pressure of a pressure limiting valve provided in the brake system for the protection of various components. A further pressure increase is not possible.
  • the reduced braking effect of the vehicle brake system results, in particular, from a reduced coefficient of friction between the brake pads and the brake disk, so that a particularly brake pressure is required in order to decelerate the vehicle effectively.
  • this object is achieved by a method having the features of patent claim 1 and by a device having the features of patent claim 8. According to the invention, it is provided that a method of the type mentioned above be carried out so that the pressure limit is increased when the brake pressure within the Hauptbremszy ⁇ Linders exceeds the activation threshold.
  • the pressure limit is increased in a FBS engagement, so that during the intervention, a higher brake pressure can be built up in the wheel brakes.
  • This makes it possible, in particular, to set a brake pressure in the event of a reduced effectiveness of the brake system and, in particular, with a reduced coefficient of friction between the brake linings of the wheel brake and the brake disk, with which the blocking pressure level of the wheel can be achieved.
  • the second value of the pressure limit is selected so high that in any case an ABS control within the FBS triggering is achieved.
  • the pressure limit is reduced from the second value to the first value when the brake pressure falls below a predetermined threshold value when the energy supply unit is switched on.
  • the pressure limit is reduced after the expiration of a predetermined Zeitin ⁇ tervalls of the second value to the first value, wherein the time interval begins at the time at which the brake pressure assumes a lower threshold.
  • Both of the above-described embodiments of the invention have the advantage that the pressure limit is reset to the original value after termination of the FBS procedure.
  • the increased pressure limit only for a short time in a FBS intervention decisive, while in normal operation of the brake system, the lower pressure limit exists, so that ei ⁇ ne damage to the brake system is avoided by excessive brake pressures ver ⁇ .
  • a continuously adjustable pressure relief valve is used in the invention, wherein the opening pressure of the pressure relief valve is increased when the brake pressure exceeds the activation threshold.
  • the pressure limiting valve is a steplessly adjustable separating valve, via which a master brake cylinder is connected to the wheel brake, and which is closed when the power supply unit is switched on.
  • Another object of the invention is a device for increasing the braking effect of a hydraulic brake system of a motor vehicle, comprising a master cylinder, in which a transferable to at least one wheel brake Brems ⁇ bar is a pressure sensor with which the brake pressure in the master cylinder is detected, a with the pressure sensor ver ⁇ connected control unit and a controllable by the control unit power supply unit, which is switched on, if within the half of the controller is detected that the brake pressure within the master cylinder one in dependence on the Vehicle delay calculated activation threshold exceeds.
  • the device is characterized in that the wheel brake is connected to a pressure limiting valve whose opening pressure can be increased by the control unit when the brake pressure in the master cylinder exceeds the activation threshold.
  • FIG. 1 shows the basic structure of a vehicle brake system suitable for carrying out the invention
  • FIG. 2 shows a diagram in which the time profile of the brake pressure in a wheel brake and the master brake cylinder, the activation threshold of the FBS function and the activity of the FBS function according to the prior art are shown, and FIG
  • FIG. 3 shows a diagram in which the time profile of the brake pressure in a wheel brake and the master brake cylinder, the activation threshold of the FBS function and the activity of the FBS function according to the invention are shown.
  • the vehicle brake system shown in FIG. 1 in a detail, suitable for embodiment of the invention, comprises an actuating device 1, which is connected to a master brake cylinder 3 via a brake force intensifier 2 and is preferably designed as a brake pedal.
  • the master cylinder 3 is fluidly connected to a Vorrats ⁇ container 4 for hydraulic fluid. It is preferably designed as a so-called tandem master cylinder, in each of which one of two coupled pressure chambers is provided for supplying pressure to a brake circuit. Usually there is an X-division of the brake circuits, in which one pressure chamber supplies the front right (VR) and the rear left (HL) wheel brake 5 and the other pressure chamber supplies the front left and rear right wheel brakes 5.
  • the wheel brakes 5 are connected via a normally open Trenn ⁇ valve 7 to the master cylinder 3, wherein each wheel 5 is additionally associated with an inlet valve 8, which is also opened normally.
  • the brake pressure built up by the driver by means of the brake booster 2 in the master brake cylinder 3 is determined which is also referred to as a form, transmitted directly to the wheel brakes 5.
  • the brake system shown also allows a force-controlled structure of a brake pressure pR ad in the wheel brakes 5 by means of the motor 9 driven by the hydraulic pump 10.
  • the separating valve 7 is closed and the normally closed switching valve 11 is opened, so that between the master cylinder 3 and the suction side of the hydraulic pump 10, a connection is formed, and the master cylinder 3 is decoupled from the pressure side of the hydraulic pump 10.
  • the hydraulic pump 10 is thus in the La ge, hydraulic fluid from the master cylinder 3 and the reservoir 4 in the wheel brakes to promote 5 to increase the Rad ⁇ brake pressure p wheel .
  • each wheel brake 5 is assigned a normally closed exhaust valve 12. If the outlet valve 12 is opened, hydraulic fluid can escape from the corresponding wheel brake 7 into the low-pressure accumulator 13 with a high degree of dynamics.
  • the hydraulic fluid from the Nie ⁇ derdruck arrived 13 then fed back into the master cylinder 3, including the switching valve 11 and the inlet valves 8 is closed and the separating valve 7 is opened.
  • a brake pressure p wheel present in the wheel brakes 5 can be kept constant, in which both the inlet valve 8 assigned to the wheel brake and the associated outlet valve 12 are closed.
  • the brake pressure p TH z set by the driver within the master cylinder 3 is measured by means of a pressure sensor 14 whose signal is transmitted to a control unit, Ches the control of the hydraulic unit 6 and the contained valves 7, 8, 11 and 12 and the motor 9 makes.
  • Braking systems embodied in the manner shown are likewise part of ESP systems which are already used in a large number of vehicles and which are known to the person skilled in the art in principle. With such brake systems, it is also possible to realize a FBS function, which is the starting point of the present invention.
  • the wheel brakes 4 are acted upon by the hydraulic pump 10 with a brake pressure p wheel which is higher than that of the driver when a reduced efficiency of the brake system is determined during a braking operation.
  • an activation threshold p T H for the brake pressure p TH z within the main brake cylinder 3 is determined as a function of the vehicle deceleration measured by means of a longitudinal acceleration sensor and / or determined from the signals of wheel speed sensors during a braking operation calculates a control unit provided for controlling the FBS function, as described in detail in German Offenlegungsschrift DE 102 38 427 A1, to which reference is hereby made in connection with the FBS function.
  • the brake assistant is preferably designed as a so-called hydraulic brake assistant (HBA) in which the pressure increase is carried out by means of the hydraulic unit 6, ie in particular by means of the hydraulic pump 10 driven by the motor 9, for which purpose the motor 9 and the valves 7, 11 be controlled in the appropriate manner by the FBS control unit (ie, the isolation valve 7 is closed and the switching valve 11 is opened.)
  • HBA hydraulic brake assistant
  • the brake assist is deactivated when the brake pressure p TH z within the master brake cylinder 3 falls below a predetermined threshold value when the FBS function is activated. This is based on that the braking request of the driver of the FBS control unit is determined based on the measured by means of the pressure sensor 14 brake pressure P THZ . It is assumed that the driver releases the brake at a decreasing brake pressure p TH z.
  • the hydraulic pump 10 is switched off when the brake pressure P THZ falls below a predetermined threshold, which is not illustrated in FIG.
  • a predetermined threshold which is not illustrated in FIG.
  • the hydraulic pump 10 is switched on again, as shown in FIG. This results in a cyclically repeating sequence of phases of activated and deactivated FBS function during a braking operation.
  • the hydraulic unit 6 is usually equipped with a pressure limiting valve which limits the brake pressure p wheel in the wheel brakes 5 to a predetermined value P MAX , which is the opening pressure p LIM of the pressure limiting valve tils corresponds.
  • P MAX the opening pressure p LIM of the pressure limiting valve tils corresponds.
  • Particularly critical components are ins ⁇ particular the calipers of the wheel brakes 5, which can take damage at a Dau ⁇ erbelastung with an excessive brake pressure pR ad .
  • the pressure limiting valve is integrated in known brake systems spielmik in the separating valve 7 and opens in ge closed separating valve 7 when the by means of hydraulic pump 10 in the wheel brakes 5 and in the supply lines to the wheel brakes 5 constructed brake pressure a certain opening ⁇ pressure p LIM exceeds, so that hydraulic fluid can flow into the master cylinder 3.
  • a continuously adjustable (analog) isolation valve 7 and thereby to dispense with an additional pressure relief valve.
  • the separating valve 7 is designed so that the opening pressure P LIM is continuously adjustable with the separating valve 7 closed by means of the FBS control unit.
  • the opening pressure p LIM is thereby preferably set to a value P MAX , which is generally above the blocking pressure of the wheel in the case of a fully functional brake, which also corresponds to the opening pressure p L iM of the conventional pressure limiting valve equivalent.
  • P MAX a value that is generally above the blocking pressure of the wheel in the case of a fully functional brake
  • this value is far (> 30%) above the locking pressure level of the wheels, and thus makes it possible to increase the brake pressure pR ad at an ESP or ASR intervention by means of the hydraulic pump 10 so far that an ABS intervention takes place and the maximum possible braking effect can be achieved
  • ESP Electronic stability program
  • ASR drive slip control
  • ABS antilock braking system
  • the increase in the opening pressure P LIM is preferably carried out by the FBS control unit when it determines that the brake pressure p TH z set by the driver during a braking process in the master brake cylinder 3 exceeds the activation threshold p T H described above. As can be seen in FIG. 3, a higher wheel brake pressure p wheel is thereby achieved in the FBS interventions during a braking process.
  • the increased value PMAX, FB S of the opening pressure p L iM must be determined by extensive driving tests. However, it must be chosen so high that the brake pressure p wheel is sufficient even with a limited effectiveness of the wheel brakes 5 in order to achieve the locking pressure level of the wheels and to bring about an ABS intervention.
  • the lowering of the opening pressure P LIM to the value P MAX provided for the normal operation of the brake system takes place when the brake pressure p T Hz within the master brake cylinder 3 falls below the lower threshold value which also applies to the brake Termination of the FBS procedure is decisive.
  • the opening pressure p LIM of the separating valve 7 is only increased when the FBS function is actually activated.
  • the opening pressure p LIM of the separating valve 7 is reduced again after a predetermined time interval to the value P MAX , which begins when the brake pressure p TH z in a FBS engagement the lower Threshold reached.
  • P MAX the opening pressure p LIM of the separating valve 7 is reduced again after a predetermined time interval to the value P MAX , which begins when the brake pressure p TH z in a FBS engagement the lower Threshold reached.

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

Abstract

L'invention concerne un procédé pour améliorer le freinage d'un véhicule automobile équipé d'un système de freinage hydraulique, ce procédé consistant à accroître une pression de freinage au niveau d'au moins un frein de roue jusqu'à une limite de pression présentant une première valeur par activation d'une unité d'alimentation en énergie lorsqu'une pression de freinage dépasse un seuil d'activation déterminé en fonction d'une décélération du véhicule. Le procédé selon l'invention se caractérise en ce que la limite de pression (pLIM) est augmentée jusqu'à une seconde valeur (pMAX, FBS) lorsque la pression de freinage (pTHZ) à l'intérieur du maître-cylindre de frein dépasse le seuil d'activation (pTH). L'invention concerne également un système permettant de mettre en oeuvre ce procédé.
PCT/EP2005/054686 2004-09-24 2005-09-20 Procede et systeme pour assister un dispositif de freinage en cas de baisse d'efficacite du systeme de freinage du vehicule WO2006032658A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112005002239T DE112005002239A5 (de) 2004-09-24 2005-09-20 Verfahren und Vorrichtung zum unterstützen eines Bremssystems bei verminderter Wirksamkeit der Fahrzeugbremsanlage

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004046379.4 2004-09-24
DE102004046379 2004-09-24

Publications (1)

Publication Number Publication Date
WO2006032658A1 true WO2006032658A1 (fr) 2006-03-30

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PCT/EP2005/054686 WO2006032658A1 (fr) 2004-09-24 2005-09-20 Procede et systeme pour assister un dispositif de freinage en cas de baisse d'efficacite du systeme de freinage du vehicule

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DE (1) DE112005002239A5 (fr)
WO (1) WO2006032658A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008008555A1 (de) 2007-02-21 2008-08-28 Continental Teves Ag & Co. Ohg Verfahren und Vorrichtung zum Minimieren von Gefahrensituationen bei Fahrzeuge n
DE102008036607A1 (de) * 2008-08-06 2010-02-11 Lucas Automotive Gmbh Verfahren und Vorrichtung zur hydraulischen Bremsdruckverstärkung
WO2011098877A1 (fr) * 2010-02-12 2011-08-18 Toyota Jidosha Kabushiki Kaisha Système de commande de frein

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5727852A (en) * 1995-01-21 1998-03-17 Robert Bosch Gmbh Method and device for controlling an ABS antilock braking / ASR traction control system
US20020038977A1 (en) * 2000-09-27 2002-04-04 Hirofumi Nitta Hydraulic brake system for vehicle
DE10238427A1 (de) * 2001-11-08 2003-05-22 Continental Teves Ag & Co Ohg Verfahren zur Unterstützung eines Bremsensystems bei verminderter Wirksamkeit der Fahrzeugbremsanlage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5727852A (en) * 1995-01-21 1998-03-17 Robert Bosch Gmbh Method and device for controlling an ABS antilock braking / ASR traction control system
US20020038977A1 (en) * 2000-09-27 2002-04-04 Hirofumi Nitta Hydraulic brake system for vehicle
DE10238427A1 (de) * 2001-11-08 2003-05-22 Continental Teves Ag & Co Ohg Verfahren zur Unterstützung eines Bremsensystems bei verminderter Wirksamkeit der Fahrzeugbremsanlage

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008008555A1 (de) 2007-02-21 2008-08-28 Continental Teves Ag & Co. Ohg Verfahren und Vorrichtung zum Minimieren von Gefahrensituationen bei Fahrzeuge n
DE102008008555B4 (de) 2007-02-21 2018-06-28 Continental Teves Ag & Co. Ohg Verfahren und Vorrichtung zum Minimieren von Gefahrensituationen bei Fahrzeugen
DE102008036607A1 (de) * 2008-08-06 2010-02-11 Lucas Automotive Gmbh Verfahren und Vorrichtung zur hydraulischen Bremsdruckverstärkung
DE102008036607B4 (de) * 2008-08-06 2020-02-06 Lucas Automotive Gmbh Verfahren und Vorrichtung zur hydraulischen Bremsdruckverstärkung
WO2011098877A1 (fr) * 2010-02-12 2011-08-18 Toyota Jidosha Kabushiki Kaisha Système de commande de frein
EP2650182A1 (fr) * 2010-02-12 2013-10-16 Toyota Jidosha Kabushiki Kaisha Système de commande de frein
US9238454B2 (en) 2010-02-12 2016-01-19 Toyota Jidosha Kabushiki Kaisha Brake control system

Also Published As

Publication number Publication date
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