WO1997026168A1 - Hydraulische bremsanlage mit einer einrichtung zur aktivbremsung - Google Patents
Hydraulische bremsanlage mit einer einrichtung zur aktivbremsung Download PDFInfo
- Publication number
- WO1997026168A1 WO1997026168A1 PCT/EP1997/000190 EP9700190W WO9726168A1 WO 1997026168 A1 WO1997026168 A1 WO 1997026168A1 EP 9700190 W EP9700190 W EP 9700190W WO 9726168 A1 WO9726168 A1 WO 9726168A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure
- brake
- line
- return pump
- piston
- Prior art date
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
- B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
- B60T15/02—Application and release valves
- B60T15/36—Other control devices or valves characterised by definite functions
- B60T15/38—Other control devices or valves characterised by definite functions for quick take-up and heavy braking, e.g. with auxiliary reservoir for taking-up slack
- B60T15/40—Other control devices or valves characterised by definite functions for quick take-up and heavy braking, e.g. with auxiliary reservoir for taking-up slack with separate take-up and applying cylinders
-
- 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
- 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
- B60T8/42—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 having expanding chambers for controlling pressure, i.e. closed systems
- B60T8/4275—Pump-back systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
- B60T8/48—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition connecting the brake actuator to an alternative or additional source of fluid pressure, e.g. traction control systems
- B60T8/4809—Traction control, stability control, using both the wheel brakes and other automatic braking systems
- B60T8/4827—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems
- B60T8/4863—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems
- B60T8/4872—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems pump-back systems
Definitions
- Hydraulic brake system with a device for active braking
- the present invention relates to a hydraulic brake system according to the preamble of claim 1.
- Such a brake system is known for example from WO 91/18776.
- the known brake system is suitable for anti-lock control and traction control.
- the traction control system as a type of active braking does not require the brake pedal to be operated. Therefore, the filling of the wheel brakes of the driven wheels must be carried out by a pump.
- the known brake system uses the return pump of the anti-lock control device.
- a pressure accumulator is installed in a suction line from the suction side of the pump to the master brake cylinder, which is intended to provide the suction side of the return pump with a pre-pressure in the case of traction control.
- a switching valve is arranged between the pressure accumulator and the suction side of the return pump, which only connects the pressure accumulator to the suction side of the return pump when a traction control is to be carried out.
- the object of the present invention is to equip a braking system of the type mentioned at the outset with simple means such that a rapid braking effect can be achieved by using the return pump for active braking.
- the principle of the present invention is therefore that the return pump acts on a small effective area of a stepped piston and displaces this stepped piston by its high delivery pressure, so that the larger effective area of the stepped piston displaces a larger volume of pressure medium than is conveyed by the return pump. Since a high pressure is not required to overcome the air play of the wheel brakes, the larger area of the stepped piston can be dimensioned considerably larger than the smaller area. If a higher pressure is required in the wheel brakes after this priming process, the return pump can then feed directly into the wheel brakes through the pressure line and also generate a high pressure with a low volume flow. So that the stepped piston is initially displaced, means are provided in the pressure line parallel to this pressure-volume translator, which initially accumulate the pump pressure.
- a pre-pressure valve is suitable for this, which has the advantage that it is permanently at a constant pressure difference. renz opens. Its opening pressure is then designed so that the dynamic pressure developed is just sufficient to fill the wheel brake cylinders of the wheels to be actively braked.
- a spring action of the stepped piston towards the pressure side of the pump causes this volume accumulator to charge automatically when the return pump is switched off.
- a seat valve which blocks the connection between the brake line and the stepped piston as soon as the stepped piston has overcome its stroke for filling the wheel brakes, prevents the stepped piston from retracting during active braking. Since the valve is dimensioned such that it has a much smaller effective area in the opening direction than the smaller stepped piston area, it cannot happen that the brake pressure built up in the brake line by the return pump pushes the stepped piston back to the return pump and the total delivery volume of the return ⁇ feed pump flows into the volume storage.
- FIG. Shows a hydraulic brake system according to the invention in a symbolic representation.
- the master cylinder 1 is connected to a storage container 2 and can be actuated via a brake pedal 3.
- a brake line 4 runs from the master cylinder 1 to a wheel brake 5.
- Another wheel brake is also supplied by the brake line 4, but is not shown.
- a separating valve 6 Arranged in the brake line 4 is a separating valve 6, which, like the inlet valve 7 inserted closer to the wheel brake 5, is an electromagnetically actuated, normally open 2/2-way valve.
- a non-return valve 8 is arranged parallel to the isolating valve 6 and allows a pressure medium flow from the master cylinder 1 to the wheel brake 5.
- a pressure relief valve 9 opens, which releases an excessively high pressure in the brake line 4 below the separating valve 6 during active braking, that is to say when the separating valve 6 is closed.
- active braking can be any type of brake intervention, which can also take place without actuation of the brake pedal 3.
- a non-return valve 10 is located parallel to the inlet valve 7, which allows a rapid pressure reduction from the wheel brake 5, even if the inlet valve 7 should still be closed when braking is ended.
- a return line 11 runs from the wheel brake 5 via an outlet valve 12 to a low-pressure accumulator 13 and from there to the suction side of a self-priming return pump 14.
- a non-return valve is inserted into the return line 11 between the low-pressure accumulator 13 and the suction side of the return pump 14.
- til 15 inserted, which only allows a pressure medium flow to the suction side of the return pump 14.
- a suction line 16 branches off from the brake line 4 between the master cylinder 1 and the isolation valve 6 and also leads via a changeover valve 17 to the suction side of the return pump 14.
- the pressure side of the latter is connected to the brake line 4 via a pressure line 18 which has a pre-pressure check valve 19 connected between isolation valve 6 and inlet valve 7.
- the pre-pressure check valve 19 is only permeable for a volume flow from the return pump 14 to the brake line 4.
- a pressure-volume translator 20 is located parallel to the pressure line 18. It has a stepped bore
- stepped piston 22 a stepped piston 22.
- the smaller end face of the stepped piston 22 is connected to the pressure side of the return pump 14.
- the step of the step piston 22 points to the brake line 4.
- This larger end face of the stepped piston 22 is acted upon by a compression spring 23 towards the return pump 14.
- the step of the step piston 22 is connected to the atmosphere.
- a sealing seat 24 which has a smaller diameter than the smaller end face of the stepped piston 22.
- This sealing seat 24 interacts with the larger end face of the stepped piston 22 as a seat valve. Since this is a purely schematic representation, the seat valve between the stepped bore 21 and the brake line 4 can also be designed differently. All that matters is the opening cross section, which must be smaller than the smaller end face of the stepped piston 22.
- a throttle 25 is provided parallel to the pressure line 18 and to the pressure-volume translator 20, which allows a pressure medium outflow from the pressure side of the return pump 14 to the brake line 4, when the return spring 14 is at a standstill, the compression spring 23 the step piston 22 to the return pump 14 moves and thus feels the volume storage spanned by the compression spring 23 again.
- the brake system works on the known return conveyor principle. Since a brake pressure is already present in the brake line 4 from the master cylinder 1, the delivery pressure of the return pump 14 is also unable to displace the stepped piston 22. The pressure in the brake line 4 has a much larger effective area on the stepped piston 22 than the pressure side of the return pump 14.
- the brake pedal 3 In the case of active braking, be it for traction control or for another control intervention such as yaw moment control, the brake pedal 3 is not actuated.
- the master cylinder 1 is therefore depressurized and with it the brake line 4 to the isolating valve 6.
- the latter is closed for active braking.
- the return pump 14 starts to run, whereby the normally closed changeover valve 17 is energized to open the suction line 16, so that the suction line 16 establishes a connection to the master cylinder 1 and thus to the reservoir 2.
- the return pump 14 therefore sucks in pressure medium and conveys it into the pressure line 18 and into the pressure-volume translator 20 before the pumped pressure medium can propagate to the brake line 4.
- the pressure built up on the pressure side of the return pump 14 has an effect even with a small delivery volume Moving the stepped piston 22 towards the brake line 4.
- a considerably larger volume is displaced towards the brake line 4 than is required for the displacement of the step piston 22 from the pressure side of the return pump 14.
- the pressure level built up in the brake line 4 is considerably lower than on the pressure side of the return pump 14.
- this is of no further importance since it is not a high pressure, but only a large volume that is required to overcome the air play of the wheel brake 5.
- the isolating valve 6 When active braking has ended, the isolating valve 6 is opened so that the brake pressure can be reduced via the brake line 4 and the master cylinder 1 into the reservoir 2.
- the pump 14 is switched off so that no further pressure medium is delivered.
- the residual pressure remaining on the pressure side of the return pump 14 slowly dissipates via the throttle 25.
- the compression spring 23 is able to move the piston 22 back to the return pump 14 into the stop position shown.
- the of the compression spring 23 spanned volume storage is thus refilled and ready for another active braking.
- the throttle 25 shown here schematically parallel to the stepped piston 22 can also pass through the stepped piston 22. It then connects the two end faces of the stepped piston, that is to say the pressure side of the return pump 14 with the brake line 4.
- the throttle 25 can have a very narrow cross section, so that it does not build up a dynamic pressure on the pressure side of the return pump 14 during active braking with special needs. This is because the pressure medium volume to be displaced in order to reset the step piston 22 is comparatively small in relation to the quantity of pressure medium contained in the volume accumulator.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9525689A JP2000503272A (ja) | 1996-01-20 | 1997-01-17 | アクティブブレーキング装置を備えた液圧ブレーキ装置 |
EP97902176A EP0874749A1 (de) | 1996-01-20 | 1997-01-17 | Hydraulische bremsanlage mit einer einrichtung zur aktivbremsung |
US09/101,412 US6195995B1 (en) | 1996-01-20 | 1997-01-17 | Hydraulic brake system with device for active braking |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19602057A DE19602057A1 (de) | 1996-01-20 | 1996-01-20 | Hydraulische Bremsanlage mit einer Einrichtung zur Aktivbremsung |
DE19602057.3 | 1996-01-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997026168A1 true WO1997026168A1 (de) | 1997-07-24 |
Family
ID=7783299
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1997/000190 WO1997026168A1 (de) | 1996-01-20 | 1997-01-17 | Hydraulische bremsanlage mit einer einrichtung zur aktivbremsung |
Country Status (5)
Country | Link |
---|---|
US (1) | US6195995B1 (de) |
EP (1) | EP0874749A1 (de) |
JP (1) | JP2000503272A (de) |
DE (1) | DE19602057A1 (de) |
WO (1) | WO1997026168A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7309112B2 (en) | 2000-05-02 | 2007-12-18 | Toyota Jidosha Kabushiki Kaisha | Braking system having valve device for delivering pressurized fluid to brake cylinder selectively from at least two pressurizing chambers or only one of them |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6464307B1 (en) * | 1999-11-24 | 2002-10-15 | Sumitomo (Sei) Brake Systems, Inc. | Automotive hydraulic pressure brake system |
JP4934937B2 (ja) * | 2001-01-31 | 2012-05-23 | 株式会社デンソー | 車両用ブレーキ装置 |
JP4109485B2 (ja) * | 2002-04-22 | 2008-07-02 | 株式会社日立製作所 | ブレーキ制御装置 |
US6905179B2 (en) * | 2003-02-07 | 2005-06-14 | Continental Teves, Inc. | Anti-lock braking system low pressure accumulator for protection master cylinder lip seals |
GB2433563A (en) * | 2005-12-21 | 2007-06-27 | Jcb Landpower Ltd | ABS system that applies torque to accelerate a wheel when the braking force is released by the ABS |
GB2437970B (en) * | 2006-04-08 | 2010-11-10 | Bamford Excavators Ltd | Improvements in or relating to braking systems |
CN102846423B (zh) * | 2006-08-21 | 2017-05-03 | 眼泪科学公司 | 用于治疗腺体功能障碍的器械 |
JP4712833B2 (ja) * | 2008-06-25 | 2011-06-29 | 日立オートモティブシステムズ株式会社 | ブレーキ制御装置およびその制御方法 |
JP6361046B2 (ja) * | 2014-12-12 | 2018-07-25 | 日立オートモティブシステムズ株式会社 | ブレーキ装置及びブレーキシステム |
CN104533858B (zh) * | 2015-01-20 | 2016-06-29 | 临沂市明达木业机械制造有限公司 | 热压机快速供油负载加压液压系统 |
US20210155215A1 (en) * | 2018-04-04 | 2021-05-27 | ZF Active Safety US Inc. | Vehicle brake system with secondary brake module |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2710067A1 (de) * | 1976-03-10 | 1977-09-22 | Girling Ltd | Regelventil-baugruppe fuer eine hydraulische fahrzeugbremsanlage |
WO1991018776A1 (de) * | 1990-06-01 | 1991-12-12 | Robert Bosch Gmbh | Bremsanlage |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2974493A (en) * | 1959-08-13 | 1961-03-14 | Goodyear Tire & Rubber | Displacement saver |
DE3444827A1 (de) * | 1984-12-08 | 1986-06-12 | Robert Bosch Gmbh, 7000 Stuttgart | Verfahren und vorrichtung zur bremsdrucksteuerung bei fahrzeugbremsanlagen |
DE3812830C1 (de) * | 1988-04-16 | 1989-07-27 | Daimler-Benz Aktiengesellschaft, 7000 Stuttgart, De | |
DE4016746A1 (de) * | 1990-05-25 | 1991-11-28 | Teves Gmbh Alfred | Bremsdruckregelvorrichtung |
DE4329139C1 (de) * | 1993-08-30 | 1994-07-28 | Daimler Benz Ag | Bremsdruck-Steuereinrichtung |
US5741050A (en) * | 1995-08-18 | 1998-04-21 | Kelsey-Hayes Company | Switchable fast-fill hydraulic circuit for use in vehicle braking systems |
-
1996
- 1996-01-20 DE DE19602057A patent/DE19602057A1/de not_active Withdrawn
-
1997
- 1997-01-17 JP JP9525689A patent/JP2000503272A/ja active Pending
- 1997-01-17 WO PCT/EP1997/000190 patent/WO1997026168A1/de not_active Application Discontinuation
- 1997-01-17 US US09/101,412 patent/US6195995B1/en not_active Expired - Fee Related
- 1997-01-17 EP EP97902176A patent/EP0874749A1/de not_active Ceased
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2710067A1 (de) * | 1976-03-10 | 1977-09-22 | Girling Ltd | Regelventil-baugruppe fuer eine hydraulische fahrzeugbremsanlage |
WO1991018776A1 (de) * | 1990-06-01 | 1991-12-12 | Robert Bosch Gmbh | Bremsanlage |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7309112B2 (en) | 2000-05-02 | 2007-12-18 | Toyota Jidosha Kabushiki Kaisha | Braking system having valve device for delivering pressurized fluid to brake cylinder selectively from at least two pressurizing chambers or only one of them |
DE10120651B4 (de) * | 2000-05-02 | 2011-09-29 | Toyota Jidosha Kabushiki Kaisha | Bremssystem |
Also Published As
Publication number | Publication date |
---|---|
DE19602057A1 (de) | 1997-07-24 |
JP2000503272A (ja) | 2000-03-21 |
US6195995B1 (en) | 2001-03-06 |
EP0874749A1 (de) | 1998-11-04 |
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