GB2177468A - Vehicular brake system with a hydraulic brake power booster - Google Patents

Vehicular brake system with a hydraulic brake power booster Download PDF

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Publication number
GB2177468A
GB2177468A GB08615536A GB8615536A GB2177468A GB 2177468 A GB2177468 A GB 2177468A GB 08615536 A GB08615536 A GB 08615536A GB 8615536 A GB8615536 A GB 8615536A GB 2177468 A GB2177468 A GB 2177468A
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GB
United Kingdom
Prior art keywords
pressure
accumulator
brake
pump
valve
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
GB08615536A
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GB2177468B (en
GB8615536D0 (en
Inventor
Gunther Buschmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Teves AG and Co oHG
Original Assignee
Alfred Teves 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 Alfred Teves GmbH filed Critical Alfred Teves GmbH
Publication of GB8615536D0 publication Critical patent/GB8615536D0/en
Publication of GB2177468A publication Critical patent/GB2177468A/en
Application granted granted Critical
Publication of GB2177468B publication Critical patent/GB2177468B/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

For servo pressure supply, a brake system with a hydraulic brake booster (1) comprises a pressure accumulator (11) and an electromotively driven pump (9, 10) which will be switched on during brake application or when the accumulator pressure has fallen under a threshold value. Upon commencement of a braking action, the brake booster (1) is fed by the pressure accumulator (11). Charging of the pressure accumulator (11) with pressure fluid out of the pump (9) is inhibited initially to ensure that the entire pump capacity is available for brake force boosting. However, as soon as the pump pressure has risen, the surplus pump output will be made use of for recharging of the pressure accumulator (11) during the braking action by means of a differential-pressure valve (12) responsive to booster output pressure, through line 20, and to pump pressure. Upon attainment of the accumulator pressure, an electro-valve (16) establishes a connection to a low pressure-supply reservoir (18). <IMAGE>

Description

SPECIFICATION Vehicular brake system with a hydraulic brake power booster This invention relates to a brake system for automotive vehicles, in particular for road vehicles, comprising an hydraulic brake power booster and an auxiliary-pressure supply system consisting of a pressure accumulator and an electromotively driven pressure-fluid pump which will be switched on when the accumulator pressurefalls undera pressure threshold and during brake application, and comprising also a hydraulically governed valve assembly which is connected to the pump and to a pressure outlet of the brake power booster, and through which the pressure-fluid pump is in hydraulic communication with the pressure accumulatorwhen the brake is not applied and which will interrupta pressure-fluid conduit from the pressure-fluid pump tothe pressure accumulator on brake application.
A brake system of this type is already known which includes an hydraulic brake power booster with a mastercylinderconnected downstreamthereofand an auxiliary-pressure supply system which is likewise composed substantially of an electromotively driven hydraulic pump, of a pressurefluidaccumulatorand a valve assembly. The pump is switched on in the event of brake application and, irrespective thereof, in the event of a drop of the accumulator pressure.Said valve assembly ensures that the pressure requirement is satisfied by the accumulator at the beginning ofthe braking action - as long asthe pressure level ofthe recently switched-on pump is still low (West German printed and published patent application 3246498). Inthisarrangement,the hydraulic pump must be dimensioned such that it will make available during braking the amount of pressure energy that is required by the hydraulic brake power booster as well as that required for recharge of the pressure accumulator.
For such a brake system, there is likewise known already a special valve assembly. It is a hydraulically governed valve which is connected to the controlled pressure of the brake power booster and ensures that during the braking action - afterthe pressure requirement has been satisfied by the pressure accumu I ator at the outset - the pressure-fluid conduit will be closed for charging of the pressure accumulatorand,consequently,thefull pump pressure will be utilised exclusivelyforthe pressure supply ofthe brake power booster (West German printed and published patent application 33 15731).
In the event of rapidly successive braking actions, though, the retarded charging ofthe pressure accumulator may become a disadvantage.
It is hence an object ofthe present invention to overcome the disadvantages of the brake systems described and to deliverthe stored pressure energy in the initial period and then the full pump output to the brake power booster, on the one hand, and to enable an early recharge of the pressure accumulator, on the other hand, in orderto have at its disposal accumulator pressure for bridging the initial period even for rapidly successive braking actions. This object should be achieved by constructively simple means and without causing any appreciable rise in thetotal costs. More specifically, cost reasons demanded not to enlarge the accumulator and not to increase the pump capacity.
According to the present invention there is provided a brake system, for automotive vehicles, comprising an hydraulic brake power booster and an auxiliary-pressure supply system consisting of a pressure accumulator and an electromotively driven pressure-fluid pump which will be switched on when the accumulator pressure falls under a pressure threshold and during brake application, and comprising also a hydraulically governed valve assemblywhich is connected to the pump and to a pressure outlet of the brake power booster, and through which the pressure-fluid pump is in hydraulic communication with the pressure accumulator when the brake is not applied and which will interrupt a pressure-filled conduit from the pressure-fluid pump to the pressure accumulator on brake application, characterised in that the valve assembly is a differential pressure valve governed by the difference between the pump pressure and the controlled pressure at the pressure outlet of the brake power booster, the said valve switching to open the pressure-fluid conduit from the pressure-fluid pump to the pressure accumulator when the pump pressure is in excess of the controlled pressure and thereby permitting charge of the pressure accumulatorto a pressure value dependent on the pressure difference.
It has thus been shown that the above object can be achieved in a surprisingly straightforward, technically advanced fashion.
Thus, a simple hydraulically governed differential-pressure valve which is supplied with the pump pressure and the controlled pressure ofthe brake power booster serves to accomplish considerable improvementofthe brake system and to safeguard sufficient accumulator pressure in the event of rapidly successive braking actions. After bridging the initial period with energy out of the pressure accumulator, recharge ofthe pressure accumulatorwill first be prevented by governing the valve with the controlled pressure, and thus the full pump output is supplied to the brake power booster.
However, as soon as the pump pressure exceeds the pressure required in the brake power booster (by a predetermined amount), this surplus will have as a consequence immediate recharge of the pressure accumulator.
According to a favourable embodiment ofthis invention,the responsefactorofthe differential-pressure valve, upon attainment of which the pressure fluid flow from the pumptothe accumulator commences, is predetermined by a spring arranged in the differential-pressure valve and counteracting the pump pressure.
Further improvement of the brake system will result, if a pressure supply reservoir is connected to the pressure-fluid conduit leading from the differential-pressure valve to the accumulatorvia a multidirectional valve switched to the open position in its inactive position, e.g. through an electromagnetically actuatable two-way/two-position directional valve, and ifthis multidirectional valve is adapted to be switched over to its closed position for the purpose of charging of the pressure accumulator. Such a multidirectional valve also serves to prevent overloading of the pump which is constantly switched on during a braking action.
Asimple piston-type accumulator having a comparatively small capacitywill suffice as a pressure accumulator. Such an accumulator can be furnished with a switch contact which will switch over on attainment of a predetermined maximum accumulator pressure.
Finally, the electromotive drive ofthe pressure-fluid pump can be switched on through a brake-actuation switch ora brake-lightswitch as well as through a contact operated when the accumulator pressure drops below the pressure threshold.
An embodimentofthe invention will now be described with reference to the accompanying drawing which shows in a schematically simplified view the hydraulic and electric circuitry of a brake system according to the invention.
In the drawing, the brake system comprises a braking pressure generator 1 which is, in turn, composed of a hydraulic bake powerbooster2 and a tandem master cylinder 3. Brake power booster and mastercylinderform a construction unit. The brake force is transmitted in the direction ofthe arrow F through a brake pedal 4 onto the braking pressure generator 1, that is onto the brake power booster 2.
Thereupon, a boosted pressure proportional to the pedalforceFwill develop inaknown fashion inside the brake power booster 2, which pressure will be transmitted via a directly connected brake circuit I directlytothewheel brakes 5, 6, on the one hand, and tothe inletofthe mastercylinder3, on the otherhand.
A pressure proportional to the pedal force F is thereby built up also in the static brake circuits ll, lil ofthe tandem mastercylinder3andthusinthewheel brakes 7 and 8. In the embodimentshown,thewheels ofthe rear axle are jointly connected to the dynamic brakecircuitl,whilethestaticmastercylindercircuits lead to the wheels of the front axle.
The essence of the invention is the auxiliary-pressure supply system ofthe brake system illustrated. It comprises a pressure-fluid pump 9 which is driven by an electric motor 10. Also, the said supply system comprises a pressure accumulator 11, herein a piston-type accumulator, as well as a differential-pressure valve 12. Moreover, there are hydraulic non-return valves 13, 14, 15 and an electromagnetically operable two-way/two-position directional valve 16. When in its inactive position, in which it is not excited, said valve 16 is switched to the open position and thus connects a pressure-fluid conduit 17with a pressure supply reservoir 18 which is herein designed as a componentofthe braking pressure generator 1 and, respectively, ofthe pressure-fluid reservoir required for the tandem master cylinder 3.The suction side ofthe pump 9 is likewise connected to the supply reservoir 18 orto its chamber 18'.
The outlet 19 of the brake power booster 2, where the controlled pressure ofthe brake circuit I is available, communicates via a pressure-fluid conduit 20 with a control chamber 21 of the differential-pressure valve 12. The pressure prevailing in this chamber 21 is transmitted onto a piston 23 assisted by the force of a spring 22, atthe opposite side of which piston, that is acting in opposite direction, the pump pressure is applied. To this end, the pressure side ofthe pressure4luid pump 9 is hydraulically connected with a control chamber 24 in the inside ofthe differential-pressure valve 12.
The pump 9 is connected to the pressure inlet 26 of the brake power booster 1 through this chamber 24 and through a pressure-fluid line 25 containing the non-return valve 13.
Charging ofthe pressure accumulator 11 takes place from the chamber 24 - after displacement ofthe piston 23 via an annularchamberand a port27,via the pressure-fluid conduitl7 andthe non-return valve 14to the pressure accumulatorll,the piston 28 of which is displaceable against a spring 29. Upon attainment ofthe maximum accumulator pressure, an electric circuit is broken by a head contact 30 of the accumulator 11.
The brake pedal 4 is equipped with a switch 31 having a working contact 32. This switch can be the brake light switch conventional in automotive vehicles. As soon as it is made, the working contact 32 applies positive potential via a diode 33 to the drive motorlOofthehydraulicpump9andtherebysets this pump into operation. Asecond conduit for electrical energy from the voltage source UB to the drive motor 10 leads via the head contact 30 ofthe pressure accumulator 11 and via a second diode 34.
Further, the two-way/two-position directional valve 16 is connected to the head contact 30.
The operation ofthe illustrated brake system is as follows. After switching on ofthe system, if the pressure accumulator 11 has not yet been charged sufficiently, the electromagnetically actuatable two-way/two-position directional valve 16 is switched overto the closed position by means ofthe closed head switch or head contact 30 and, moreover, the pump motor 10 is set into function via the diode 34. Thereupon, the pressure4luid pump 9 generates pressure displacing the piston 23 in opposition to the force of the spring 22 because controlled pressure does not yet exist in this situation.Via the port 27, the pressure-fluid conduit 17 and viathe non-return valve 14, pressure fluid will now be introduced into the accumulator 1 1.As soon as the pressure in the accumulator 11 reaches a predetermined threshold value, the piston 28 will abut on the head switch 30, which has a consequence interruption ofthe current supply forthe valve 16 and forth drive motor 10. The accumulator pressure is permanently present atthe pressure inlet 26 of the brake power booster 1.
Upon application ofthe brake, the contact 32 of the switch 31 will be made and sets the drive motor 100f the pump 9 into operation. The pump pressure rises with a predetermined finite speed depending on the type of pump and the pump capacity. The auxiliary pressure required at the beginning ofthe braking action is taken from the pressure accumulator 11.
Controlled pressure is transmitted via the pressure-fluid conduit 20to the differential-pressure valve 12. This controlled pressure, assisted by the force ofthe spring 22, is compared with the pump pressure metered into the chamber 24. As soon as the force exerted by the pump pressure on the piston 23 exceeds the force exerted on the piston by the controlled pressure and the force of the spring 22, the differential pressure will displace the piston 23 so that the pressure-fluid conduit leading from the chamber 24via the annular chamber 27, via the pressure-fluid conduit 17 and the non-return valve 14to the pressure accumulator 11 will be released.During the braking action, the valve 16 is switched to the closed position caused by the immediate energy removal from the accumulator 1 1,which resulted in making ofthe contact 30.
If the maximum accumulator pressure is reached again after recharge ofthe pressure accumulator 1, this leads to interruption ofthe current path via the contact 30so that the valve 16 will re-assume its inactive position and release a pressure-fluid conduit 35 to the supply reservoir 18. Thereby, further pressure increase in the chamber24will be discontinued sothatthe pump 9, which continuesto be switched on through the switch 31 when the brake is actuated, hasto deliver only againstthis predefined maximum pressure which is composed ofthe maximum accumulator pressure and the force exerted by the spring 22 ofthe differential-pressure valve 12. That means that this way and owing to this arrangement,the pump accumulator 11 is immediately recharged with the surplus energy, i.e.
the pump output which is momentarily not needed for braking, and, in addition, overloading of the pump 9 in consequence of a too long brake application and a relatively low consumption of auxiliary pressure is prevented. Thus, immediately upon renewed braking shortly aftertermination of the preceding braking action,the maximum accumulator pressure will be available atthe inlet 26 ofthe brake powerboosterl for bridging ofthe pump's initial period of operation.

Claims (10)

1. A brake system, for automotive vehicles, comprising an hydraulic brake power booster and an auxiliary-pressure supply system consisting of a pressure accumulator and an electromotively driven pressure-fluid pump which will be switched on when the accumulator pressure falls under a pressure threshold and during brake application, and comprising also a hydraulically governed valve assemblywhich is connected to the pump and to a pressure outlet of the brake power booster, and through which the pressure-fluid pump is in hydraulic communication with the pressure accumulatorwhen the brake is not applied and which will interrupta pressure-fluid conduitfromthe pressure-fluid pump to the pressure accumulator on brake application, characterised in that the valve assembly is a differential pressure valve (12) governed by the difference between the pump pressure and the controlled pressure at the pressure outlet (19) ofthe brake power booster (1 ),the said valve (12) switching to open the pressure-fluid conduit (17)from the pressure-fluid pump (9) to the pressure accumulator (11) when the pump pressure is in excess ofthe controlled pressure and thereby permitting charge of the pressure accumulator (11) to a pressure value dependent on the pressure difference.
2. A brake system as claimed in claim 1, characterised in that the response factor of the differential-pressure valve (12), upon attainment of which the pressure-fluid flow from the pressure-fluid pump (9) to the pressure accumulator (11) commences, is predetermined by a spring (22) arranged in the differential-pressure valve (12) and counteracting the pump pressure.
3. A brake system as claimed in claim 1 or claim 2, characterised in that a pressure-supply reservoir (18) is connected to the pressure-fluid conduit (17) leading from the differential-pressure valve (12) to the pressure accumulator (11) via a multidirectional valve (16) switched to the open position in its inactive position, and in that this multidirectionalvalve (16) is adapted to be switched over to its closed position for the purpose of charging ofthe pressure accumulator (11).
4. A brake system as claimed in claim 3, characterised in that the multidirectional valve (16) is switchableto re-assume its opened position during a braking action after charging of the pressure accumulator(11).
5. A brake system as claimed in claim 3 or claim 4, characterised in that the multidirectional valve (16) is designed as an electromagnetically operable two-way/two-position directional valve.
6. A brake system as claimed in any one ofthe preceding claims, characterised in that a piston-type accumulator is provided as the pressure accumulator (11).
7. A brake system as claimed in claim 3, characterised in thatthe pressure accumulator (11) is furnished with a switch contact (30) which will switch over on attainment of a predetermined maximum accumulator pressure.
8. A brake system as claimed in anyone ofthe preceding claims, characterised in thatthe electromotive drive (10) of the pressure-fluid pump (9) is adapted to be switched on through a brake-actuation switch or brake-light switch (31) as well as through a contact (30) operated when the accumulator pressure drops below the pressure threshold.
9. A brake system as claimed in anyone of claims 3 to 5, characterised in that the multidirectional valve (16) is switchable to assume its opened position on attainment ofthe predetermined maximum accumulator pressure.
10. A brake system, for automotive vehicles, substantially as herein described with reference to and as illustrated in the accompanying drawing.
GB8615536A 1985-07-03 1986-06-25 Vehicular brake system with a hydraulic brake power booster Expired GB2177468B (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 (3)

Publication Number Publication Date
GB8615536D0 GB8615536D0 (en) 1986-07-30
GB2177468A true GB2177468A (en) 1987-01-21
GB2177468B GB2177468B (en) 1989-07-19

Family

ID=6274850

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8615536A Expired GB2177468B (en) 1985-07-03 1986-06-25 Vehicular brake system with a hydraulic brake power booster

Country Status (4)

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

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2570667A1 (en) * 1984-09-27 1986-03-28 Nissin Kogyo Kk PRESSURE SOURCE FOR AUTOMOTIVE HYDRAULIC BOOSTER
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
EP0299510A2 (en) * 1987-07-16 1989-01-18 Sumitomo Electric Industries Limited Antiskid control device
GB2211572A (en) * 1987-12-21 1989-07-05 Nippon Piston Ring Co Limited Apparatus for generating pressure difference in a vehicle brake servo
WO1990000127A1 (en) * 1988-07-01 1990-01-11 Alfred Teves Gmbh Hydraulic clutch and brake system with such a clutch
US7296861B2 (en) * 2003-04-25 2007-11-20 Lucas Automotive Gmbh Brake system for a motor vehicle
CN102371982A (en) * 2010-08-11 2012-03-14 罗伯特·博世有限公司 Braking system for vehicles
CN103085796A (en) * 2011-11-02 2013-05-08 财团法人车辆研究测试中心 Brake power-assisting source system with brake kinetic energy recovery and failure protection functions
IT201600132414A1 (en) * 2016-12-29 2018-06-29 Vhit S P A Soc Unipersonale Power unit for braking system

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Publication number Priority date Publication date Assignee Title
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

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US2945352A (en) * 1957-07-03 1960-07-19 Kelsey Hayes Co Fluid pressure booster system
US3889467A (en) * 1974-06-24 1975-06-17 Midland Ross Corp Accumulator arrangement for a booster brake mechanism
US4317332A (en) * 1979-02-28 1982-03-02 General Motors Corporation Hydraulic power brake system and hydraulic brake booster and controls therefor
DE3247498C2 (en) * 1982-12-22 1995-04-13 Teves Gmbh Alfred Hydraulic brake system for motor vehicles
DE3315731A1 (en) * 1983-04-29 1984-10-31 Alfred Teves Gmbh, 6000 Frankfurt HYDRAULIC BRAKE SYSTEM FOR MOTOR VEHICLES

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2570667A1 (en) * 1984-09-27 1986-03-28 Nissin Kogyo Kk PRESSURE SOURCE FOR AUTOMOTIVE HYDRAULIC BOOSTER
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
WO1988009733A1 (en) * 1987-06-10 1988-12-15 Allied-Signal Inc. Anti-lock braking system
AU615167B2 (en) * 1987-06-10 1991-09-26 Allied-Signal Inc. Anti-lock braking system with pump, and three-way and two-waysolenoid valves defining hold, build and decay valves
EP0299510A3 (en) * 1987-07-16 1990-09-12 Sumitomo Electric Industries Limited Antiskid control device
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CN103085796B (en) * 2011-11-02 2014-11-19 财团法人车辆研究测试中心 Brake power-assisting source system with brake kinetic energy recovery and failure protection functions
IT201600132414A1 (en) * 2016-12-29 2018-06-29 Vhit S P A Soc Unipersonale Power unit for braking system

Also Published As

Publication number Publication date
GB2177468B (en) 1989-07-19
FR2584357A1 (en) 1987-01-09
FR2584357B1 (en) 1989-08-18
JPS6218360A (en) 1987-01-27
GB8615536D0 (en) 1986-07-30
DE3523776A1 (en) 1987-01-08

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Effective date: 19940625