FR2584357A1 - DEVICE FOR SUPPLYING AUXILIARY PRESSURE TO A BRAKING SYSTEM - Google Patents

DEVICE FOR SUPPLYING AUXILIARY PRESSURE TO A BRAKING SYSTEM Download PDF

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Publication number
FR2584357A1
FR2584357A1 FR8609674A FR8609674A FR2584357A1 FR 2584357 A1 FR2584357 A1 FR 2584357A1 FR 8609674 A FR8609674 A FR 8609674A FR 8609674 A FR8609674 A FR 8609674A FR 2584357 A1 FR2584357 A1 FR 2584357A1
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France
Prior art keywords
pressure
accumulator
valve
pump
braking system
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.)
Granted
Application number
FR8609674A
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French (fr)
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FR2584357B1 (en
Inventor
Gunther Buschmann
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Continental Teves AG and Co oHG
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Alfred Teves GmbH
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Publication of FR2584357A1 publication Critical patent/FR2584357A1/en
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Publication of FR2584357B1 publication Critical patent/FR2584357B1/en
Expired legal-status Critical Current

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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
    • B60T8/40—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 comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/404—Control of the pump unit
    • B60T8/405—Control of the pump unit involving the start-up phase
    • 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
    • B60T13/14—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 accumulators or reservoirs fed by pumps
    • B60T13/142—Systems with master cylinder
    • B60T13/145—Master cylinder integrated or hydraulically coupled with booster
    • B60T13/146—Part of the system directly actuated by booster pressure
    • 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
    • B60T13/14—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 accumulators or reservoirs fed by pumps
    • B60T13/148—Arrangements for pressure supply
    • 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
    • B60T17/02—Arrangements of pumps or compressors, or control devices therefor
    • 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
    • B60T8/40—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 comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/404—Control of the pump unit
    • 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

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

Abstract

SYSTEME DE FREINAGE POUR VEHICULES AUTOMOBILES, EN PARTICULIER POUR VEHICULES ROUTIERS, QUI COMPREND UN AMPLIFICATEUR HYDRAULIQUE DE FORCE DE FREINAGE ET UN SYSTEME D'ALIMENTATION EN PRESSION AUXILIAIRE CONSISTANT EN UN ACCUMULATEUR DE PRESSION ET UNE POMPE A LIQUIDE DE PRESSION A COMMANDE ELECTROMAGNETIQUE QUI EST COMMUTEE LORSQUE LA PRESSION DE L'ACCUMULATEUR TOMBE AU-DESSOUS D'UN SEUIL DE PRESSION ET PENDANT L'ACTIONNEMENT DES FREINS, ET COMPRENANT EGALEMENT UNE VALVE A COMMANDE HYDRAULIQUE QUI EST RELIEE A LA POMPE ET A LA SORTIE DE L'AMPLIFICATEUR DE FORCE DE FREINAGE, ET PAR LAQUELLE LA POMPE A LIQUIDE DE PRESSION EST EN COMMUNICATION HYDRAULIQUE AVEC L'ACCUMULATEUR DE PRESSION LORSQUE LES FREINS NE SONT PAS ACTIONNES ET QUI INTERROMPT LA CONDUITE DE LIQUIDE DE PRESSION ALLANT DE LA POMPE A LIQUIDE DE PRESSION A L'ACCUMULATEUR DE PRESSION LORS DE L'ACTIONNEMENT DES FREINS, CARACTERISE EN CE QUE LA VALVE EST CONCUE EN TANT QUE VALVE A PRESSION DIFFERENTIELLE 12 COMMANDEE PAR LA DIFFERENCE ENTRE LA PRESSION DE LA POMPE ET LA PRESSION DE COMMANDE A LA SORTIE 19 DE L'AMPLIFICATEUR DE FORCE DE FREINAGE 1, CETTE VALVE 12 SE COMMUTANT POUR OUVRIR LA CONDUITE DU LIQUIDE DE PRESSION 17 ALLANT DE LA POMPE A LIQUIDE DE PRESSION 9 A L'ACCUMULATEUR DE PRESSION 11 LORSQUE LA PRESSION DE LA POMPE DEPASSE LA PRESSION DE COMMANDE, ET PERMETTANT AINSI LA CHARGE DE L'ACCUMULATEUR DE PRESSION 11 A UNE VALEUR DE PRESSION DEPENDANT DE LA DIFFERENCE DE PRESSION.DANS LESQUELLES R ET R DESIGNENT, INDEPENDAMMENT L'UN DE L'AUTRE, UN RADICAL ALKYLE EN C-C, UN GROUPEMENT HYDROXYLE, UN ATOME D'HALOGENE, UN GROUPEMENT CARBOXYLE OU TRIFLUOROMETHYLE, LA FONCTION AMINE POUVANT EGALEMENT PROVENIR D'UN SUCRE AINSI QUE LEURS ISOMERES ET SELS PHARMACEUTIQUEMENT ET COSMETIQUEMENT ACCEPTABLES.BRAKING SYSTEM FOR MOTOR VEHICLES, IN PARTICULAR FOR ROAD VEHICLES, WHICH INCLUDES A HYDRAULIC BRAKING FORCE AMPLIFIER AND AN AUXILIARY PRESSURE SUPPLY SYSTEM CONSISTING OF A PRESSURE ACCUMULATOR AND A PRESSURE LIQUID PUMP WITH ELECTRIC PRESSURE CONTROLLED WHEN THE ACCUMULATOR PRESSURE FALLS BELOW A PRESSURE THRESHOLD AND DURING THE BRAKE ACTIVATION, AND ALSO INCLUDING A HYDRAULIC CONTROLLED VALVE WHICH IS CONNECTED TO THE PUMP AND TO THE FORCE AMPLIFIER OUTPUT BRAKE, AND BY WHICH THE PRESSURE FLUID PUMP IS IN HYDRAULIC COMMUNICATION WITH THE PRESSURE ACCUMULATOR WHEN THE BRAKES ARE NOT ACTIVATED AND WHICH INTERRUPTS THE PRESSURE FLUID LINE FROM THE PRESSURE LIQUID PUMP TO THE PRESSURE ACCUMULATOR. PRESSURE WHEN THE BRAKES ARE ACTIVATED, CHARACTERIZED IN THAT THE VALVE IS DESIGNED AS A DIFFERENTIAL PRESSURE VALVE 12 CONTROLLED BY DI FFERENCE BETWEEN THE PUMP PRESSURE AND THE CONTROL PRESSURE AT THE BRAKE FORCE AMPLIFIER 1 OUTPUT 19, THIS VALVE 12 SWITCHING TO OPEN THE PRESSURE FLUID LINE 17 FROM THE PRESSURE FLUID PUMP 9 TO THE PRESSURE ACCUMULATOR 11 WHEN THE PUMP PRESSURE EXCEEDS THE CONTROL PRESSURE, AND THUS ALLOWING THE CHARGE OF THE PRESSURE ACCUMULATOR 11 TO A PRESSURE VALUE DEPENDING ON THE PRESSURE DIFFERENCE, IN WHICH R AND R DESIGNATE, INDEPENDENT ONE OF THE OTHER, A CC RADICAL ALKYL, A HYDROXYL GROUP, A HALOGEN ATOM, A CARBOXYL OR A TRIFLUOROMETHYL GROUP, THE AMINE FUNCTION MAY ALSO ARISE FROM A SUGAR AS WELL AS THEIR ISOMERS AND SALTS PHARMACEABRICALLY AND ACCEPTALLY COSTLY. .

Description

La présente invention concerne un système de freinage qui est prévu pourThe present invention relates to a braking system which is provided for

les véhicules automobiles, en particulier pour les véhicules routiers, et comprend un amplificateur hydraulique de force  motor vehicles, particularly for road vehicles, and includes a hydraulic force amplifier

de freinage et un système d'alimentation en pression auxiliaire con-  braking system and an auxiliary pressure supply system

sistant en un accumulateur de pression et une pompe à liquide de pression à commande électromagnétique qui est commutée lorsque la pression de l'accumulateur tombe au-dessous d'un seuil de pression et pendant l'actionnement des freins, et comprenant également une valve  consisting of a pressure accumulator and an electromagnetically controlled pressure liquid pump which is switched when the pressure of the accumulator falls below a pressure threshold and during the actuation of the brakes, and also comprising a valve

à commande hydraulique qui est reliée à la pompe à liquide de pres-  hydraulically operated which is connected to the pressure liquid pump

sion et à la sortie de l'amplificateur de force de freinage, et par  and at the output of the braking force amplifier, and by

laquelle la pompe à liquide de pression est en communication hydrau-  which the pressure liquid pump is in hydraulic communication

lique avec l'accumulateur de pression lorsque les freins ne sont pas actionnés et qui interrompt la conduite de liquide de pression allant de la pompe à liquide de pression a l'accumulateur de pression lors  with the pressure accumulator when the brakes are not applied and which interrupts the pressure liquid line going from the pressure liquid pump to the pressure accumulator when

de l'actionnement des freins.brake application.

On connait déjà un système de freinage de ce type qui com-  We already know a braking system of this type which

porte un amplificateur de force de freinage hydraulique muni d'un  carries a hydraulic brake force booster with a

mattre-cylindre qui lui est relié en aval et un système d'alimenta-  master cylinder connected to it downstream and a fuel system

tion en pression auxiliaire qui est également compose essentiellement  tion in auxiliary pressure which is also basically composed

d'une pompe hydraulique à entraînement électromoteur, d'un accumula-  a hydraulic pump with electromotive drive, an accumulator

teur de liquide de pression et d'une valve. La pompe se commute en cas d'actionnement des freins et, indépendamment de ce fait, en cas de chute de la pression à l'intérieur de l'accumulateur. La valve garantit que l'accumulateur atteint la pression nécessaire au début de l'action de freinage - tant que le niveau de pression de la pompe qui vient de se commuter reste faible (demande de brevet allemand 32  pressure fluid valve and valve. The pump is switched on when the brakes are applied and, independently of this fact, in the event of a drop in pressure inside the accumulator. The valve ensures that the accumulator reaches the pressure required at the start of the braking action - as long as the pressure level of the pump which has just switched remains low (German patent application 32

46 498). Dans cet agencement, la pompe hydraulique doit être dimen-  46 498). In this arrangement, the hydraulic pump must be dimensioned

sionnee de façon a fournir, pendant le freinage, la quantité d'ener-  adjusted to provide, during braking, the amount of energy

gie de pression requise par l'amplificateur de force de freinage hy-  pressure range required by the hy- braking force amplifier

draulique ainsi que celle requise pour la recharge de l'accumulateur  as well as that required for recharging the accumulator

de pression.pressure.

Une valve spéciale est également connue pour un système de freinage de ce type. Il s'agit d'une valve à commande hydraulique qui est reliée a la pression de commande de l'amplificateur de force de freinage et garantit que, pendant l'action de freinage - après que la pression requise ait été fournie par l'accumulateur de pression au commencement - la conduite du liquide de pression sera fermée pour le chargement de l'accumulateur de pression et qu'en conséquence la  A special valve is also known for a braking system of this type. This is a hydraulically operated valve which is connected to the control pressure of the brake force booster and ensures that during the braking action - after the required pressure has been supplied by the accumulator pressure at the start - the pressure fluid line will be closed for charging the pressure accumulator and consequently the

pression totale de la pompe sera utilisée exclusivement pour l'ali-  total pump pressure will be used exclusively for supply

mentation en pression de l'amplificateur de force de freinage (deman- de de brevet allemand 33 15 731). Cependant dans le cas d'actions de freinage qui se succèdent rapidement, le retard de chargement de  braking force amplifier pressure statement (German patent application 33 15 731). However, in the case of braking actions which follow one another quickly, the delay in loading

l'accumulateur de pression peut devenir un inconvénient.  the pressure accumulator can become a drawback.

La présente invention a donc pour but de surmonter les in-  The object of the present invention is therefore to overcome the

convénients des systèmes de freinage décrits et de fournir pendant la phase initiale l'énergie de pression stockée puis le débit total de la pompe à l'amplificateur de force de freinage, d'une part, et de permettre un rechargement rapide de l'accumulateur de pression, d'autre part, afin de disposer de la pression de l'accumulateur pour passer la phase initiale même en cas d'actions de freinage qui se succèdent rapidement. Ce but pourrait Gtre atteint par de simples  the advantages of the braking systems described and of supplying, during the initial phase, the stored pressure energy then the total flow from the pump to the braking force amplifier, on the one hand, and allowing rapid recharging of the accumulator pressure, on the other hand, in order to have the pressure of the accumulator to pass the initial phase even in the event of braking actions which succeed one another quickly. This goal could be achieved by simple

moyens de conception et sans causer d'augmentation importante du to-  design means and without causing a significant increase in the to-

tal des coûts. Plus précisément il ne fallait pas, pour les raisons  tal of costs. More specifically it was not necessary, for the reasons

financieres, agrandir l'accumulateur ni accroître le débit de la pom-  increase the accumulator or increase the pump flow

pe.eg.

Il s'est avéré que ce but peut être atteint d'une manière  It turned out that this goal can be achieved in a way

étonnamment simple, techniquement évoluée, dans un système de frei-  surprisingly simple, technically advanced, in a brake system

nage du type mentionné intialement, la valve étant conçue en tant que valve à pression différentiellecommandée par la différence entre la  swims of the type mentioned initially, the valve being designed as a differential pressure valve controlled by the difference between the

pression de la pompe et la pression de commande a la sortie de l'am-  pump pressure and control pressure at the outlet of the

plificateur de force de freinage, cette valve se commutant pour ou-  braking force planner, this valve switching for or

vrir la conduite du liquide de pression allant de la pompe 3 liquide de pression à l'accumulateur de pression lorsque la pression de la pompe dépasse la pression de commande, et permettant ainsi la charge de l'accumulateur de pression à une valeur de pression dépendant de  screw the pressure liquid line going from the pressure liquid pump 3 to the pressure accumulator when the pump pressure exceeds the control pressure, thus allowing the pressure accumulator to be charged to a dependent pressure value of

la différence de pression.the pressure difference.

Ainsi, grâce à la présente invention, une simple valve à pression différentielle à commande hydraulique qui est alimentée par la pression de la pompe et la pression de commande de l'amplificateur  Thus, thanks to the present invention, a simple differential pressure valve with hydraulic control which is supplied by the pressure of the pump and the control pressure of the amplifier.

de force de freinage permet d'accomplir un perfectionnement considé-  of braking force enables a considerable improvement to be accomplished

rable du système de freinage et de conserver une pression suffisante  braking system and maintain sufficient pressure

dans l'accumulateur dans le cas d'actions de freinage qui se succè-  in the accumulator in the case of successive braking actions

dent rapidement. Après le passage de la phase initiale avec de l'é-  tooth quickly. After going through the initial phase with e-

nergie fournie par l'accumulateur de pression, la recharge de cet accumulateur est tout d'abord empêchée par la commande de la vanne au moyen de la pression de commande et, de ce fait, le débit total de la pompe est amena à l'amplificateur de force de freinage. Cependant, dès que la pression de la pompe dépasse la pression requise dans l'amplificateur de force de freinage (d'une quantité déterminée), cet excédent a pour conséquence une recharge immédiate de l'accumulateur  energy supplied by the pressure accumulator, the recharging of this accumulator is first of all prevented by the control of the valve by means of the control pressure and, therefore, the total flow of the pump is brought to the brake force amplifier. However, as soon as the pump pressure exceeds the pressure required in the braking force booster (by a determined amount), this excess results in immediate recharging of the accumulator

de pression.pressure.

Dans un mode de réalisation avantageux de la présente in-  In an advantageous embodiment of the present in-

vention, le facteur de réponse de la valve à pression différentielle, auquel le liquide de pression commence à s'écouler de la pompe vers  vention, the response factor of the differential pressure valve, at which the pressure fluid begins to flow from the pump to

l'accumulateur, peut être predeterminé par un ressort dispose a l'in-  the accumulator, can be predetermined by a spring arranged internally

térieur de la valve à pression différentielle et s'opposant a la  of the differential pressure valve and opposing the

pression de la pompe.pump pressure.

Un perfectionnement additionnel du système de freinage est  An additional improvement of the braking system is

obtenu si un réservoir d'alimentation en pression est relié à la con-  obtained if a pressure supply tank is connected to the con-

duite du liquide de pression allant de la valve à pression différen-  pressure fluid line from the differential pressure valve

tielle à l'accumulateur en passant par une valve multidirectionnelle en position ouverte lorsqu'elle est inactivée, par  tial to the accumulator through a multidirectional valve in the open position when it is inactivated, by

exemple une valve directionnelle a deux voies/deux positions à com-  example a directional valve with two ways / two positions with

mande electromagnétique, et si cette valve multidrectionnelle est  electromagnetic control, and if this multidirectional valve is

adaptée de façon à se commuter à sa position fermee en vue du charge-  adapted so as to switch to its closed position for charging-

ment de l'accumulateur de pression. Une valve mutidirectionnelle de ce type sert également a éviter la surcharge de la pompe qui est  pressure accumulator. A multi-directional valve of this type also serves to avoid the overload of the pump which is

constamment commutEe pendant une action de freinage.  constantly switched during a braking action.

Conformement à un autre mode de réalisation, un simple ac-  In accordance with another embodiment, a simple ac-

cumulateur du type l piston ayant une capacité comparativement faible suffit comme accumulateur de pression. Un accumulateur de ce type  accumulator of the l piston type with a comparatively low capacity is sufficient as a pressure accumulator. An accumulator of this type

peut Etre muni d'un contact de commutation qui se commute dès l'ob-  can be fitted with a switching contact which switches as soon as it is

tention d'une pression maximum prédeterminée de l'accumulateur.  maintenance of a predetermined maximum pressure of the accumulator.

Enfin il est également prévu, conformément à un mode de  Finally, provision is also made, in accordance with a method of

réalisation de la presente invention, que l'entraînement électromo-  embodiment of the present invention, that the electromechanical drive

teur de la pompe à liquide de pression se commute sous l'action d'un commutateur d'actionnement des freins ou un commutateur des feux stop ainsi que sous l'action d'un contact commande lorsque la pression de  The pressure fluid pump is switched under the action of a brake actuation switch or a brake light switch as well as under the action of a control contact when the pressure of

l'accumulateur descend au-dessous du seuil de pression.  the accumulator drops below the pressure threshold.

Les différents objets et caractéristiques de l'invention  The different objects and characteristics of the invention

seront maintenant détaillés dans la description qui va suivre, faite  will now be detailed in the description which follows, made

à titre d'exemple non limitatif, en se reportant a la figure annexée qui représente une vue schématique simplifiée du circuit hydraulique  by way of nonlimiting example, referring to the appended figure which represents a simplified schematic view of the hydraulic circuit

et électrique d'un système de freinage conforme à l'invention.  and electric braking system according to the invention.

Sur le dessin, le système de freinage conforme à l'inven-  In the drawing, the braking system in accordance with the invention

tion représenté comprend un générateur de pression de freinage 1 qui,  tion shown comprises a brake pressure generator 1 which,

à son tour, est composé d'un amplificateur de force de freinage hy-  in turn, is composed of a hy- braking force amplifier

draulique 2 et d'un maitre-cylindre en tandem 3. L'amplificateur de force de freinage et le maitre-cylindre constituent un ensemble unitaire. La force de freinage est transmise dans le sens de la flèche F par une pédale de frein 4 au genérateur de pression de  2 and a tandem master cylinder 3. The braking force amplifier and the master cylinder constitute a unitary assembly. The braking force is transmitted in the direction of arrow F by a brake pedal 4 to the pressure generator of

freinage 1, c'est-à-dire à l'amplificateur de force de freinage 2.  braking 1, i.e. to the braking force amplifier 2.

Ensuite, une pression amplifiée proportionnelle à la force à la pe-  Then, an amplified pressure proportional to the force at the pe-

dale F se forme d'une manière connue à l'intérieur de l'amplificateur de force de freinage 2, cette pression étant transmise,par un circuit de freinage I directement connecté, aux freins des roues , 6 d'une part, et à l'entree du maitre-cylindre 3 d'autre part. Ainsi une pression proportionnelle A la force de la pédale F se forme  dale F is formed in a known manner inside the braking force amplifier 2, this pressure being transmitted, by a braking circuit I directly connected, to the wheel brakes, 6 on the one hand, and to the entry of the master cylinder 3 on the other hand. Thus a pressure proportional to the force of the pedal F is formed

aussi dans les circuits de freinage statiques II, III du maitre-cy-  also in static brake circuits II, III of the master

lindre en tandem 3 et, de ce fait, dans les freins des roues 7 et 8.  lind in tandem 3 and, therefore, in the brakes of wheels 7 and 8.

Dans le mode de réalisation representé, les roues de l'essieu arrière sont reliées conjointement au circuit de freinage dynamique I tandis  In the embodiment shown, the wheels of the rear axle are connected jointly to the dynamic braking circuit I while

que les circuits statiques du maitre-cylindre vont aux roues de l'es-  that the static circuits of the master cylinder go to the wheels of the

sieu avant.front god.

L'essentiel de la présente invention consiste dans le sys-  The essence of the present invention consists in the system

tème d'alimentation en pression auxiliaire du système de freinage représenté. Ce système comprend une pompe a liquide de pression 9 qui  auxiliary pressure supply valve of the braking system shown. This system includes a pressure liquid pump 9 which

est commandée par un moteur électrique 10. De plus, ce système d'ali-  is controlled by an electric motor 10. In addition, this supply system

mentation comprend un accumulateur de pression 11, qui est un accumu-  mentation comprises a pressure accumulator 11, which is an accumulator

lateur du type à piston dans le cas présent, ainsi qu'une valve A  piston type lator in this case, as well as a valve A

pression différentielle 12. Il est également prévu des valves anti-  differential pressure 12. Anti-slip valves are also provided

retour hydrauliques 13, 14, 15 et une valve directionnelle 16 à deux voies/deux positions à commande électromagnétique. Lorsqu'elle se trouve dans sa position inactivée lorsqu'elle n'est pas sous tension, cette valve 16 est ouverte et relie ainsi une conduite  hydraulic return 13, 14, 15 and a two-way / two-position directional valve 16 with electromagnetic control. When it is in its inactivated position when it is not energized, this valve 16 is open and thus connects a pipe

de liquide de pression 17 avec un réservoir d'alimentation en pres-  pressure fluid 17 with a pressure supply tank

sion 18 qui est prévu dans le cas présent en tant que composant du générateur de pression de freinage 1 et, respectivement, du réservoir 3 liquide de pression nécessaire au mattre-cylindre en tandem 3. -Le côté aspiration de la pompe 9 est relié de la même façon au reservoir  sion 18 which is provided in the present case as a component of the brake pressure generator 1 and, respectively, of the reservoir 3 of pressure liquid necessary for the master cylinder in tandem 3. -The suction side of the pump 9 is connected the same way at the tank

d'alimentation 18 ou 3 la chambre 18' de celui-ci.  supply 18 or 3 the chamber 18 'thereof.

La sortie 19 de l'amplificateur de force de freinage 2 3  The output 19 of the braking force amplifier 2 3

laquelle la pression de commande du circuit de freinage I est appli-  which the brake circuit control pressure I is applied

quee communique, par une conduite de liquide de pression 20, avec une chambre de commande 21 de la valve à pression différentielle 12. La pression régnant dans cette chambre 21 est transmise 3 un piston 23 assiste par la force d'un ressort 22, la pression de la pompe étant  that communicates, via a pressure liquid line 20, with a control chamber 21 of the differential pressure valve 12. The pressure prevailing in this chamber 21 is transmitted 3 a piston 23 assists by the force of a spring 22, the pump pressure being

appliquée sur la face opposée de ce piston, c'est-à-dire celle agis-  applied to the opposite face of this piston, that is to say that acting

sant en sens inverse. A cet effet le côté sous pression de la pompe à liquide de pression 9 est relié hydrauliquement avec une chambre de  health in reverse. To this end, the pressurized side of the pressure liquid pump 9 is hydraulically connected with a

commande 24 à l'intérieur de la valve de pression différentielle 12.  control 24 inside the differential pressure valve 12.

La pompe 9 est reliée 3 l'entrée de pression 26 de l'amplificateur de force de freinage 1 par la chambre 24 et par une conduite de liquide  The pump 9 is connected 3 to the pressure input 26 of the braking force amplifier 1 by the chamber 24 and by a liquid line

de pression 25 comprenant la valve anti-retour 13.  25 including the non-return valve 13.

Le chargement de l'accumulateur de pression 11 s'effectue a partir de la chambre 24 - apres déplacement du piston 23 - en passant  The loading of the pressure accumulator 11 takes place from the chamber 24 - after displacement of the piston 23 - passing

par une chambre annulaire et un orifice 27, par la conduite du liqui-  by an annular chamber and an orifice 27, by the liquid line

de de pression 17 et la valve anti-retour 14, jusqu'à l'accumulateur de pression 11, dont le piston se déplace à l'encontre d'un ressort 29. Dès l'obtention de la pression maximum de l'accumulateur, un circuit électrique est interrompu par un contact de tête 30 de l'accumulateur 11. La pedale de freins 4 est équipee d'un commutateur 31 muni d'un contact de travail 32. Ce commutateur peut être le commutateur des feux stop classique sur les véhicules automobiles. Dès qu'il se ferme, le contact de travail 32 applique un potentiel positif, par une diode 33, au moteur d'entraînement 10 de la pompe hydraulique 9  of pressure 17 and the non-return valve 14, to the pressure accumulator 11, the piston of which moves against a spring 29. As soon as the maximum pressure of the accumulator is obtained, an electrical circuit is interrupted by a head contact 30 of the accumulator 11. The brake pedal 4 is equipped with a switch 31 provided with a working contact 32. This switch can be the switch for conventional stop lights on the motor vehicles. As soon as it closes, the working contact 32 applies a positive potential, by a diode 33, to the drive motor 10 of the hydraulic pump 9

et fait ainsi fonctionner cette pompe. Une seconde conduite de l'é-  and thus operates this pump. A second conduct of the e-

nergie électrique allant de la source de tension UB au moteur d'en-  electrical energy from the voltage source UB to the drive motor

tratnement 10 passe par un contact de tête 30 de l'accumulateur de  traction 10 goes through a head contact 30 of the accumulator

pression 11 et par une seconde diode 34. De plus, la valve direction-  pressure 11 and by a second diode 34. In addition, the directional valve

nelle à deux voies/deux positions 16 est reliée au contact de tête 30. Le fonctionnement du système de freinage illustre, conforme à l'invention, est le suivant: après la commutation du système, si l'accumulateur de pression 11 n'a pas été charge suffisamment, la  two-way / two-position 16 is connected to the head contact 30. The operation of the illustrated braking system, in accordance with the invention, is as follows: after the system has been switched, if the pressure accumulator 11 has not not been charged enough, the

valve directionnelle à deux voies/deux positions 16 a commande élec-  two-way / two-position directional valve 16 with electric control

tromagnetique se commute en position fermée au moyen du commutateur de tête ferme ou contact de tète 30 et, de plus, le moteur de la pompe 10 se  tromagnetique is switched to the closed position by means of the firm head switch or head contact 30 and, in addition, the pump motor 10 is

met 3 fonctionner grâce à la diode 34. La pompe du liquide de pres-  puts 3 to work thanks to the diode 34. The pump of the liquid of pres-

sion 9 produit une pression qui fait se déplacer le piston 23 en sens opposé 3 la force du ressort 22 car la pression de commande n'existe plus dans ce cas. Le liquide de pression est alors introduit dans  sion 9 produces a pressure which causes the piston 23 to move in the opposite direction 3 the force of the spring 22 because the control pressure no longer exists in this case. The pressure liquid is then introduced into

l'accumulateur 11 par l'orifice 27, la conduite de liquide de pres-  the accumulator 11 through the orifice 27, the pressure liquid line

sion 17 et la valve anti-retour 14. Dès que la pression atteint 3 l'intérieur de l'accumulateur 11 une valeur de seuil prédéterminée, le piston 28 s'applique contre le commutateur de tète 30, ce qui a pour conséquence d'interrompre l'alimentation électrique de la valve 16 et  sion 17 and the non-return valve 14. As soon as the pressure reaches 3 inside the accumulator 11 a predetermined threshold value, the piston 28 is applied against the head switch 30, which has the consequence of interrupt the power supply to valve 16 and

du moteur d'entraînement 10. La pression de l'accumulateur est pré-  drive motor 10. The accumulator pressure is pre-

sente en permanence à l'entrée de pression 26 de l'amplificateur de  permanently feels at the pressure input 26 of the booster

force de freinage 1.braking force 1.

Dès l'actionnement des freins, le contact 32 du commutateur  As soon as the brakes are applied, contact 32 of the switch

31 se ferme et met le moteur d'entratnement 10 de la pompe 9 en mar-  31 closes and starts the drive motor 10 of the pump 9

che. La pression de la pompe s'Elève avec une vitesse finale préde-  che. The pump pressure rises with a predefined final speed.

terminée qui est fonction du type de la pompe et du débit de celle-  which depends on the type of pump and its flow

ci. La pression auxiliaire requise au début de l'action de freinage provient de 1' accumulateur de pression 11. La pression de commande est transmise par la conduite du liquide de pression 20 a la valve à pression différentielle 12. Cette pression de commande, assistée par la force du ressort 22, est comparée avec la pression de la pompe régnant dans la chambre 24. Dès que la force exercée par la pression de la pompe sur le piston 23 dépasse la force exercée sur le piston par la pression de commande et la force du ressort 22, la pression  this. The auxiliary pressure required at the start of the braking action comes from the pressure accumulator 11. The control pressure is transmitted by the line of the pressure liquid 20 to the differential pressure valve 12. This control pressure, assisted by the force of the spring 22 is compared with the pressure of the pump prevailing in the chamber 24. As soon as the force exerted by the pressure of the pump on the piston 23 exceeds the force exerted on the piston by the control pressure and the force of spring 22, the pressure

différentielle fait se déplacer le piston 23 de manière à ce qu'une con-  differential moves piston 23 so that a

duite du liquide de pression partant de la chambre 24, passant par la chambre annulaire 27, la conduite du liquide de pression 17 et la valve anti-retour 14 pour aller jusqu'à l'accumulateur de pression 11  pressure liquid from the chamber 24, passing through the annular chamber 27, the pressure liquid line 17 and the non-return valve 14 to go to the pressure accumulator 11

soit libéree. Pendant l'action de freinage, la valve 16 s'est commu-  be released. During the braking action, the valve 16 has switched

tee en position fermée, sous l'effet de l'énergie immédiatement extraite de l'accumulateur 11, ce qui a eu pour conséquence la fermeture du  tee in the closed position, under the effect of the energy immediately extracted from the accumulator 11, which had the consequence of closing the

contact 30.contact 30.

Si la pression maximum de l'accumulateur est atteinte à nouveau après la recharge de l'accumulateur de pression 11, il en résulte une interruption du trajet du courant par le contact 30 de  If the maximum pressure of the accumulator is reached again after recharging of the pressure accumulator 11, this results in an interruption of the current path by the contact 30 of

sorte que la valve 16 reprend sa position inactiv6eet libère une con-  so that the valve 16 returns to its inactive position and releases a con-

duite de liquide de pression 35 allant au réservoir d'alimentation  pressure liquid pick 35 going to the supply tank

18. De ce fait, l'élévation de la pression dans la chambre 24 s'in-  18. As a result, the rise in pressure in chamber 24 becomes

terrompt de sorte que la pompe 9, qui continue à être commutée par le commutateur 31 lorsque les freins sont actionnés, ne doit débiter que contre cette pression maximum prédéterminée qui est composée de la  terrompt so that the pump 9, which continues to be switched by the switch 31 when the brakes are applied, must flow only against this predetermined maximum pressure which is composed of the

pression maximum de l'accumulateur et de la force exercée par le res-  maximum accumulator pressure and force exerted by the res-

sort 22 de la valve à pression différentielle 12. Ceci signifie que, de cette façon et grâce à cet agencement, l'accumulateur de la pompe 11 se recharge immédiatement avec l'énergie en excas, c'est-a-dire  exits 22 from the differential pressure valve 12. This means that, in this way and thanks to this arrangement, the accumulator of the pump 11 is immediately recharged with excess energy, that is to say

que le débit de la pompe qui n'est pas nécessaire au freinage momen-  that the pump flow which is not necessary for the momentary braking

tanément et, de plus, la surcharge de la pompe 9 due à un actionne-  temporarily and, in addition, the overload of the pump 9 due to an actuation

ment trop long des freins et a une consommation relativement faible de pression auxiliaire sont évités. Ainsi, dès le renouvellement du freinage peu après la fin de l'action de freinage précédente, la pression maximum de l'accumulateur sera disponible à l'entrée 26 de l'amplificateur de force de freinage 1 pour passer la phase initiale  brakes that are too long and have a relatively low consumption of auxiliary pressure are avoided. Thus, as soon as the braking is renewed shortly after the end of the previous braking action, the maximum pressure of the accumulator will be available at the input 26 of the braking force amplifier 1 to pass the initial phase

du fonctionnement de la pompe.pump operation.

Claims (9)

REVENDICATIONS 1. Système de freinage pour véhicules automobiles, en par-  1. Braking system for motor vehicles, in particular ticulier pour véhicules routiers, qui comprend un amplificateur hy-  particular for road vehicles, which includes a hy- draulique de force de freinage et un système d'alimentation en pres-  brake force hydraulics and a pressure supply system sion auxiliaire consistant en un accumulateur de pression et une pom-  auxiliary pressure consisting of a pressure accumulator and a pump pe a liquide de pression a commande électromagnétique qui est commu- tee lorsque la pression de l'accumulateur tombe au-dessous d'un seuil  eg electromagnetically controlled pressure liquid which is switched when the accumulator pressure falls below a threshold de pression et pendant l'actionnement des freins, et comprenant éga-  pressure and during brake application, and also including lement une valve a commande hydraulique qui est reliée a la pompe et à la sortie de l'amplificateur de force de freinage, et par laquelle la pompe a liquide de pression est en communication hydraulique avec l'accumulateur de pression lorsque les freins ne sont pas actionnés et qui interrompt la conduite de liquide de pression allant de la pompe a liquide de pression a l'accumulateur de pression lors de l'actionnement des frein, caractérisé en ce que la valve est conçue en tant que valve à pression différentielle (12) commandée par la différence entre la pression de la pompe et la pression de commande a la sortie (19) de l'amplificateur de force de freinage (1), cette  Lement a hydraulically operated valve which is connected to the pump and to the output of the braking force amplifier, and by which the pressure fluid pump is in hydraulic communication with the pressure accumulator when the brakes are not actuated and which interrupts the pressure liquid line from the pressure liquid pump to the pressure accumulator when the brakes are actuated, characterized in that the valve is designed as a differential pressure valve (12) controlled by the difference between the pump pressure and the control pressure at the output (19) of the braking force amplifier (1), this valve (12) se commutant pour ouvrir la conduite du liquide de pres-  valve (12) switching to open the pressure liquid line sion (17) allant de la pompe a liquide de pression (9) a l'accumula-  from the pressure liquid pump (9) to the accumulator teur de pression (11) lorsque la pression de la pompe dépasse la pression de commande, et permettant ainsi la charge de l'accumulateur de pression (11) a une valeur de pression dépendant de la différence  pressure tor (11) when the pump pressure exceeds the control pressure, and thus allowing the charging of the pressure accumulator (11) has a pressure value dependent on the difference de pression.pressure. 2. Système de freinage conforme a la revendication 1, ca-  2. Braking system according to claim 1, ca- ractérisé en ce que le facteur de réponse de la valve à pression dif-  characterized in that the response factor of the pressure valve differs férentielle (12), auquel le liquide de pression commence a s'écouler de la pompe a liquide de pression (9) vers l'accumulateur de pression  (12), at which the pressure liquid begins to flow from the pressure liquid pump (9) to the pressure accumulator (11), peut être prédéterminé par un ressort (22) disposé a l'inté-  (11), can be predetermined by a spring (22) arranged inside rieur de la valve a pression différentielle (12) et s'opposant a la  of the differential pressure valve (12) and opposing the pression de la pompe.pump pressure. 3. Système de freinage conforme conforme a l'une quelconque  3. Compliant braking system according to any one des revendications 1 ou 2, caractérisé en ce qu'un réservoir d'ali-  claims 1 or 2, characterized in that a feed tank mentation en pression (18) est relie 3 la conduite du liquide de pression (17) allant de la valve à pression différentielle (12) à l'accumulateur de pression (11) par une valve multidirectionnelle (16) en position ouverte lorsqu'elle est inactivée, et en ce que cette valve mutidirectionnelle (16) est adaptée pour se commuter vers sa  pressure indication (18) is connected 3 to the pressure liquid line (17) going from the differential pressure valve (12) to the pressure accumulator (11) by a multidirectional valve (16) in the open position when it is inactivated, and in that this multidirectional valve (16) is adapted to switch to its position fermée en vue de charger l'accumulateur de pression (11).  closed position for charging the pressure accumulator (11). 4. Système de freinage conforme a la revendication 3, ca-  4. Braking system according to claim 3, ca- racterise en ce que la valve mutidirectionnelle (16) est commutable pour reprendre sa position ouverte pendant une action de freinage  in that the two-way valve (16) is switchable to return to its open position during a braking action après le chargement de l'accumulateur de pression (11).  after charging the pressure accumulator (11). 5. Système de freinage conforme à l'une quelconque des re-  5. Braking system according to any of the vendications 3 ou 4, caractérisé en ce que la valve mutidirectionnel-  vendications 3 or 4, characterized in that the mutidirectional valve- le (16) est conçue sous forme de valve directionnelle à deux voies/-  (16) is designed as a two-way directional valve / - deux positions à commande électromagnétique.  two positions with electromagnetic control. 6. Système de freinage conforme 1 l'une quelconque des re-  6. Braking system according to any of the vendications 1 à 5, caractérisé en ce qu'un accumulateur du type à  vendications 1 to 5, characterized in that an accumulator of the type piston est prévu en tant qu'accumulateur de pression (11).  piston is provided as a pressure accumulator (11). 7. Système de freinage conforme à la revendication 3, ca-  7. Braking system according to claim 3, ca- ractérisé en ce que l'accumulateur de pression (11) est muni d'un contact de commutation (30) qui se commute dès l'obtention d'une  characterized in that the pressure accumulator (11) is provided with a switching contact (30) which switches as soon as a pression maximum prédéterminée de l'accumulateur.  predetermined maximum accumulator pressure. 8. Système de freinage conforme A l'une quelconque des re-  8. Braking system in accordance with any of the vendications 1 à 7, caractérisé en ce que l'entratnement electromo-  vendications 1 to 7, characterized in that the electromo- teur (10) de la pompe à liquide de pression (9) est adapté pour être  pressure fluid pump (9) (10) is adapted to be commute par un commutateur d'actionnement des freins ou le commuta-  switches via a brake actuation switch or the switch teur des feux stop (31) ainsi que par un contact (30) actionne lors-  stop lights (31) as well as by a contact (30) actuates when que la pression de l'accumulateur tombe au-dessous du seuil de pres-  the accumulator pressure falls below the pressure threshold sion.if we. 9. Système de freinage conforme à l'une quelconque des re-  9. Braking system in accordance with any of the vendications 3 A 5, caractérise en ce que la valve mutidirectionnelle  vendications 3 to 5, characterized in that the mutidirectional valve (16) est commutable pour reprendre sa position ouverte des l'obten-  (16) is switchable to return to its open position from the tion de la pression maximum predéterminEe de l'accumulateur.  tion of the predetermined maximum pressure of the accumulator.
FR8609674A 1985-07-03 1986-07-03 AUXILIARY PRESSURE SUPPLY DEVICE OF A BRAKING SYSTEM Expired FR2584357B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19853523776 DE3523776A1 (en) 1985-07-03 1985-07-03 MOTOR VEHICLE BRAKE SYSTEM WITH HYDRAULIC BRAKE POWER AMPLIFIER

Publications (2)

Publication Number Publication Date
FR2584357A1 true FR2584357A1 (en) 1987-01-09
FR2584357B1 FR2584357B1 (en) 1989-08-18

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FR8609674A Expired FR2584357B1 (en) 1985-07-03 1986-07-03 AUXILIARY PRESSURE SUPPLY DEVICE OF A BRAKING SYSTEM

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JP (1) JPS6218360A (en)
DE (1) DE3523776A1 (en)
FR (1) FR2584357B1 (en)
GB (1) GB2177468B (en)

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US4778226A (en) * 1987-06-10 1988-10-18 Allied-Signal Inc. Anti-lock braking system with pump, and three-way and two-way solenoid valves defining hold, build and decay valves
JP2631474B2 (en) * 1987-07-16 1997-07-16 住友電気工業株式会社 Anti-lock control device
JPH01164670A (en) * 1987-12-21 1989-06-28 Nippon Piston Ring Co Ltd Pressure difference generating device for master bag in brake magnification system for diesel engine automobile
DE3906528A1 (en) * 1988-07-01 1990-01-04 Teves Gmbh Alfred HYDRAULIC CLUTCH DEVICE AND BRAKE SYSTEM WITH SUCH A CLUTCH
JPH0634198Y2 (en) * 1990-04-25 1994-09-07 東洋運搬機株式会社 Brake device for electric loading vehicles
DE4036399A1 (en) * 1990-11-15 1992-05-21 Teves Gmbh Alfred High pressure storage unit - has damping element formed as rubber disc between piston and spring
JP2581915Y2 (en) * 1992-10-16 1998-09-24 株式会社村田製作所 Dielectric filter
DE10318850A1 (en) 2003-04-25 2004-11-18 Lucas Automotive Gmbh Braking facility for a motor vehicle has a servo pressure circuit and a main braking cylinder with a displaceable primary piston in a hydraulic braking circuit for creating a braking pressure
DE102010039186A1 (en) * 2010-08-11 2012-02-16 Robert Bosch Gmbh Braking system e.g. external power braking system, for motor car, has hydraulic actuator device actuating piston of master brake cylinder, and pump pumping hydraulic fluid from wheel brake cylinder to master brake cylinder in operating mode
CN103085796B (en) * 2011-11-02 2014-11-19 财团法人车辆研究测试中心 Brake booster system with brake kinetic energy recovery and failure protection
IT201600132414A1 (en) * 2016-12-29 2018-06-29 Vhit S P A Soc Unipersonale Power unit for braking system

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DE3523776A1 (en) 1987-01-08
GB2177468A (en) 1987-01-21
GB2177468B (en) 1989-07-19
JPS6218360A (en) 1987-01-27
FR2584357B1 (en) 1989-08-18
GB8615536D0 (en) 1986-07-30

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