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WO1997019842A1 - Systeme de freinage avec dispositif de freinage actif - Google Patents

Systeme de freinage avec dispositif de freinage actif Download PDF

Info

Publication number
WO1997019842A1
WO1997019842A1 PCT/EP1996/004944 EP9604944W WO9719842A1 WO 1997019842 A1 WO1997019842 A1 WO 1997019842A1 EP 9604944 W EP9604944 W EP 9604944W WO 9719842 A1 WO9719842 A1 WO 9719842A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve body
valve
pressure
pump
master cylinder
Prior art date
Application number
PCT/EP1996/004944
Other languages
German (de)
English (en)
Inventor
Erhard Beck
Original Assignee
Itt Automotive Europe Gmbh
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 Itt Automotive Europe Gmbh filed Critical Itt Automotive Europe Gmbh
Priority to JP9520106A priority Critical patent/JP2000500718A/ja
Priority to EP96938182A priority patent/EP0861176A1/fr
Publication of WO1997019842A1 publication Critical patent/WO1997019842A1/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
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/16—Master control, e.g. master cylinders
    • B60T11/22—Master control, e.g. master cylinders characterised by being integral with reservoir
    • 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
    • B60T8/341—Systems characterised by their valves
    • 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
    • B60T8/4881—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems pump-back systems having priming means

Definitions

  • the present invention relates to a brake system according to the preamble of claim 1.
  • Such a brake system is known for example from DE 41 28 091 AI.
  • the publication relates to a brake system with anti-lock and traction control, with a master cylinder which can be acted upon by a brake pedal with brake pressure, which is fed with pressure medium from a reservoir and is connected to at least one wheel brake of at least one wheel brake of a driven wheel, with a low pressure accumulator and a return pump for anti-lock operation as well as with a pre-pressure generator, however with a limited delivery volume, for the traction control.
  • the pre-pressure generator is arranged in the storage container and is also provided for quickly filling the wheel brake of the driven wheel as well as for generating a pre-pressure on the suction side of the return pump.
  • the known brake system is the only form of active braking that controls traction control.
  • active braking means that a brake intervention can take place independently of the brake pedal.
  • Another goal of active braking can be yaw moment control when driving through a curve, for example, if the vehicle tends to oversteer or understeer.
  • yaw moment control in particular, the fastest possible brake intervention is required in order to maintain the driving stability of the vehicle.
  • a starting slip control it does not matter, for example, whether the driven wheel continues to spin for a few milliseconds or not. A subpoena is then not necessary for such purposes.
  • the self-priming return pump is able to draw its own pressure medium from the reservoir - in contrast to a pure return pump, which requires a pre-pressure.
  • a pure return pump which requires a pre-pressure.
  • it must be ensured that the return pump does not have to overcome excessively high throttle resistances during suction.
  • a corresponding amount of pressure medium must be available in order to build up the necessary brake pressure. If, however, a pre-charging takes place, it would be desirable if the pre-pressure source were not exhausted after a single actuation.
  • the object of the present invention is to provide a slip-controlled hydraulic brake system of the type mentioned at the outset, in which the pre-pressure source, which builds up a pre-pressure via the master cylinder in the brake system, spends a basically unlimited delivery volume in the brake circuits can and in which the return pump has the possibility of automatically sucking in pressure medium from the reservoir via the brake line and the master cylinder even without precharging with the lowest possible throttle losses.
  • a hydraulically actuated one Valve which connects the pressure side of the precharge pump to the master cylinder in the case of precharge and, in the case of suction by the return pump without precharging the suction side to the reservoir volume of the pressure medium container, ensures on the one hand that the precharge pump in principle unlimited volume can be brought into the brake circuits, and on the other hand that the suction side of the return pump when the return pump is operating without charging not only in connection with the limited volume of a pre-charging chamber but with the total supply volume of the pressure medium container stands.
  • Such a valve is preferably actuated hydraulically, since electrical lines and an electrical control logic are thus saved.
  • the delivery pressure and / or pulse of the pre-charge pump allows the valve to move a valve body and thus open the way into the brake circuit;
  • valve body Despite a bypass, it is recommended to also allow a pressure medium flow along the valve body, but this is only throttled. In this way, a pressure reduction from the brake circuits or from the pressure side of the precharge pump is possible, even if the bypass is still blocked by the valve body.
  • the design of the valve body There are two possibilities for the design of the valve body: If the density of the valve body is greater than that of the pressure medium, that is after the design in the basic position of the valve, that is to say with the precharging pump at rest, the bypass from the master cylinder to the supply volume of the pressure medium container opened.
  • the other version in which the valve body has a lower density than the pressure medium, has the advantage that the brake circuits can be precharged immediately without first having to swallow a certain quantity of pressure medium inside the container by moving the valve body the pressure reaches the brake circuits.
  • a precharging pump also has to draw in its pumped pressure medium from a container, it is recommended that its suction side be connected to the pressure medium container itself. It is of course also conceivable to provide a separate container for the precharging pump. Then, however, it must be ensured that this separate container is refilled when its volume is exhausted.
  • FIG. 1 shows a section of a brake system according to the invention, in which a part of a pressure medium container and a master cylinder is shown, with a hydraulically operated valve being arranged in the connection between the pressure medium container and the master cylinder, which valve is actuated by the delivery pressure of a precharging pump.
  • a pressure medium container 2 which is only shown in sections, is attached to a master cylinder 1 in a manner known per se. increases. Also only a section of the master cylinder 1 is shown, which shows a trailing bore 3 and part of the cylinder bore 4, the actuating pistons which are displaceable within the cylinder bore 4 not being shown.
  • the trailing bore 3 connects the cylinder bore 4 to the container connection 5.
  • the pressure medium container 2 is filled with pressure medium to a height that lies above the cutout shown.
  • the pressure medium container 2 is divided into a storage chamber 6 and a valve chamber 7.
  • the valve chamber 7 has a bypass 8, which connects its upper end 9 to its lower end 10, which is connected to the container connection 5.
  • the wall 11 of the valve chamber 7 is cylindrical and receives a valve body 12 which is guided axially displaceably within the valve chamber 7 with a loose fit.
  • the valve chamber 7 has an opening 13 which, like the upper connection 14 of the valve chamber 7 to the bypass 8, is covered by an upward movement of the valve body 12.
  • the valve body 12 On its underside, the valve body 12 has a cylindrical recess 15, into which a tube 16 projects vertically, the other end of which extends out of the pressure medium container 2 and is connected to the pressure side of a precharge pump 17.
  • valve body 12 In order to lend the valve body 12 a defined basic position, there are two possibilities.
  • valve body If the valve body is designed so that its density is greater than that of the pressure medium used, for example brake fluid, then it is in its basic position on the end of the tube 16, so that the pressure medium connection from the opening 13 via the bypass 8 to the container connection 5 ge ⁇ opens.
  • the precharge pump 17 starts up, the The valve body 12 is raised as a result of the pressure medium pulse and the pressure drop between its lower and upper sides, which is reduced by the gap between the valve body 12 and the wall 11, and closes the opening 13 and the upper connection 14 of the bypass 8 to the valve chamber 7. Absolute tightness is not necessary, since the precharge pump 17 can continuously deliver pressure medium, even if a partial flow flows into the reservoir volume 6 of the pressure medium container 2.
  • the volume in the valve chamber 7 initially decreases with the bypass 8 still closed over the gap between the valve body 12 and the wall 11 until the upper connection 14 of the bypass 8 by lowering the valve body 12 is open again.
  • valve body 12 can also have a lower density than the pressure medium used. However, it must then be designed such that the valve body 12 lowers at a low negative pressure of the order of 10 mbar from the container connection 5 and releases the connection from the upper opening 13 via the bypass 8 to the container connection 5, so that the Pressure medium can reach the suction side of a self-priming return pump via the follow-up bore 3.
  • the precharging pump 17 does not have to move the valve body 12 in order to build up a pre-pressure. Pressure and volume are therefore immediately available for the purpose of pre-charging as part of active braking.
  • Refilling by the return pump is also possible at any time, since the valve body 12 lowers at the lower end of the valve chamber 7 in accordance with the decrease in the pressure medium volume and releases the bypass 8.
  • a discharge of pressure medium from the master cylinder into the pressure medium container 2 can take place along the valve body 12 or also via the precharge pump 17, which in turn is connected with its suction side to the reservoir tank 2 (pump leakage).
  • Both variants offer the possibility, even without operation of the precharging pump 17, of having the self-priming return pump draw in pressure medium from the supply volume 6 even without large throttle loss.
  • container connection 5 pressure medium container 2
  • valve arrangement and pump connection shown is used for the pressure rod circuit of the master cylinder 1 which is actuated directly by the brake pedal, a pre-charge of both brake circuits can be achieved by means of a single upstream pressure generator, since the floating piston , which separates the two brake circuits from one another within the master cylinder 1, distributes the built-up pressure evenly between the two brake circuits.

Landscapes

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

Abstract

Système de freinage hydraulique antipatinage à dispositif de freinage actif équipé d'un générateur de précompression (17), établissant une précompression dans un circuit de freinage, par l'intermédiaire d'une prise de connexion au réservoir (5) du maître-cylindre (1). A cet effet, sur une prise de connexion au réservoir (5) est montée une soupape présentant une chambre de soupape (7) à paroi rectiligne verticale (11) à l'intérieur de laquelle un corps de soupape (12) est déplaçable axialement. Au-dessus du corps de soupape (12), la chambre de soupape (7) présente un orifice (13) communiquant avec un volume de réserve (6) du réservoir à fluide sous pression (2). Au-dessous du corps de soupape (12), un tube (16) débouche dans la chambre de soupape (7), ce tube étant connecté côté refoulement d'une pompe de pré-alimentation (17). L'extrémité supérieure (9) et l'extrémité inférieure (10) de la chambre de soupape (7) sont reliées par une dérivation (8) devant laquelle se déplace le corps de soupape (12) lors du fonctionnement de la pompe de pré-alimentation (17), obturant ainsi en même temps l'orifice (13) conduisant au volume de réserve (6). La pompe (17) est ainsi en mesure d'établir au-dessous du corps de soupape (12), dans la chambre de soupape (7), une précompression qui se propage, via l'orifice de compensation (3) et le maître-cylindre (1), dans le circuit de freinage correspondant, cependant qu'il est possible d'obtenir, via la dérivation (8), à partir du volume de réserve (6), une aspiration automatique d'une pompe se trouvant dans le circuit de freinage.
PCT/EP1996/004944 1995-11-29 1996-11-12 Systeme de freinage avec dispositif de freinage actif WO1997019842A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP9520106A JP2000500718A (ja) 1995-11-29 1996-11-12 アクティブブレーキング装置を備えたブレーキ装置
EP96938182A EP0861176A1 (fr) 1995-11-29 1996-11-12 Systeme de freinage avec dispositif de freinage actif

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1995144442 DE19544442A1 (de) 1995-11-29 1995-11-29 Bremsanlage mit einer Einrichtung zur Aktivbremsung
DE19544442.6 1995-11-29

Publications (1)

Publication Number Publication Date
WO1997019842A1 true WO1997019842A1 (fr) 1997-06-05

Family

ID=7778671

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1996/004944 WO1997019842A1 (fr) 1995-11-29 1996-11-12 Systeme de freinage avec dispositif de freinage actif

Country Status (4)

Country Link
EP (1) EP0861176A1 (fr)
JP (1) JP2000500718A (fr)
DE (1) DE19544442A1 (fr)
WO (1) WO1997019842A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997042067A1 (fr) * 1996-05-08 1997-11-13 Robert Bosch Gmbh Systeme de freinage hydraulique pour vehicule

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009047738A1 (de) * 2009-12-09 2011-06-16 Robert Bosch Gmbh Fahrzeugbremssystem

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3337545A1 (de) * 1983-10-15 1985-04-25 Robert Bosch Gmbh, 7000 Stuttgart Hydraulische bremsanlage
DE4020448A1 (de) * 1990-06-27 1992-01-02 Teves Gmbh Alfred Bremsdruckgeber, insbesondere fuer schlupfgeregelte bremsanlagen
WO1992017357A1 (fr) * 1991-04-04 1992-10-15 Alfred Teves Gmbh Dispositif de freinage de vehicules a moteur a regulation de la pression de freinage en fonction du patinage au freinage et a l'entrainement
DE4128091A1 (de) * 1991-08-24 1993-02-25 Teves Gmbh Alfred Bremsanlage mit blockierschutz-und antriebsschlupfregelung
DE4445401A1 (de) * 1993-12-21 1995-06-22 Aisin Seiki Hydraulik-Bremssystem für ein Kraftfahrzeug

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4017874A1 (de) * 1990-06-02 1991-12-05 Bosch Gmbh Robert Hydraulische zweikreisbremsanlage
DE4436913A1 (de) * 1994-10-15 1995-12-14 Daimler Benz Ag Hydraulische Bremsanlage für Fahrzeuge

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3337545A1 (de) * 1983-10-15 1985-04-25 Robert Bosch Gmbh, 7000 Stuttgart Hydraulische bremsanlage
DE4020448A1 (de) * 1990-06-27 1992-01-02 Teves Gmbh Alfred Bremsdruckgeber, insbesondere fuer schlupfgeregelte bremsanlagen
WO1992017357A1 (fr) * 1991-04-04 1992-10-15 Alfred Teves Gmbh Dispositif de freinage de vehicules a moteur a regulation de la pression de freinage en fonction du patinage au freinage et a l'entrainement
DE4128091A1 (de) * 1991-08-24 1993-02-25 Teves Gmbh Alfred Bremsanlage mit blockierschutz-und antriebsschlupfregelung
DE4445401A1 (de) * 1993-12-21 1995-06-22 Aisin Seiki Hydraulik-Bremssystem für ein Kraftfahrzeug

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997042067A1 (fr) * 1996-05-08 1997-11-13 Robert Bosch Gmbh Systeme de freinage hydraulique pour vehicule

Also Published As

Publication number Publication date
EP0861176A1 (fr) 1998-09-02
DE19544442A1 (de) 1997-06-05
JP2000500718A (ja) 2000-01-25

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