EP2197717A1 - Système de frein à force extérieure hydraulique - Google Patents

Système de frein à force extérieure hydraulique

Info

Publication number
EP2197717A1
EP2197717A1 EP08835897A EP08835897A EP2197717A1 EP 2197717 A1 EP2197717 A1 EP 2197717A1 EP 08835897 A EP08835897 A EP 08835897A EP 08835897 A EP08835897 A EP 08835897A EP 2197717 A1 EP2197717 A1 EP 2197717A1
Authority
EP
European Patent Office
Prior art keywords
valve
brake
pressure
control
brake 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.)
Withdrawn
Application number
EP08835897A
Other languages
German (de)
English (en)
Inventor
Andreas Remmelmann
Hubertus Mies
Arne Weidemann
Dietmar Seubert
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2197717A1 publication Critical patent/EP2197717A1/fr
Withdrawn legal-status Critical Current

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
    • 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
    • B60T8/36—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 including a pilot valve responding to an electromagnetic force
    • B60T8/3695—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 including a pilot valve responding to an electromagnetic force wherein the pilot valve is mounted separately from its power section
    • 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
    • B60T13/16—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 pumps directly, i.e. without interposition of accumulators or reservoirs
    • 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
    • B60T8/36—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 including a pilot valve responding to an electromagnetic force
    • B60T8/3615—Electromagnetic valves specially adapted for anti-lock brake and traction control systems
    • B60T8/3675—Electromagnetic valves specially adapted for anti-lock brake and traction control systems integrated in modulator units

Definitions

  • the invention relates to a hydraulic power-brake system according to the preamble of claim 1.
  • Such hydraulic power brake systems are described in the data sheet RD 66 226 / 06.00 of Mannesmann Rexroth AG. Accordingly, a pressure medium connection between the wheel brake cylinders of the respective brake circuits and in each case a hydraulic accumulator is controlled in a 2-circuit power-assisted braking system via a operated with a brake pedal power brake valve. This is charged via a accumulator charging valve by a pump, the brake system with priority over other consumers with Pressure fluid supplied as soon as the accumulator pressure reaches a lower limit. Upon actuation of the power brake valve, the pressure in the wheel brake cylinders is regulated in proportion to the actuation force of the pedal. Particularly in the case of fast vehicles, efforts are being made to implement the power-operated braking systems with anti-lock braking system functionality (ABS functionality). Since the wheel brake cylinder such hydraulic
  • ABS solutions are known for pneumatic power brake systems, they require a very large installation space due to the low energy density of the compressed air and moreover have the above-described disadvantages, so that hydraulic solutions are preferred.
  • the present invention seeks to provide a simple design hydraulic power brake system with ABS functionality.
  • control pressure can be changed by controlling pilot valve elements by means of an ABS control unit. That is, in this solution takes place during the ABS control, the control of the brake pressure via a 3-way valve, which is controlled via two simple design pilot valve elements, so that compared to the post-published solution described above, a more compact, less expensive construction of the power brake system is possible.
  • a control chamber of the directional control valve can be acted upon by pressure via a first pilot valve and can be connected to the tank via a second pilot valve.
  • pilot valve is a fast-switching 2/2-way valve. This is preferably carried out normally closed.
  • the first pilot valve may be designed as a nozzle in a particularly simple construction embodiment.
  • a fast switching 2/2-way valve can be used, as used in automotive applications.
  • This pilot valve is preferably designed to be normally open.
  • the continuously adjustable directional control valve can be normally open or de-energized with respect to the pressure connection.
  • a pressure compensation valve be provided.
  • This pressure compensating valve may be assigned a throttle in each brake line.
  • the structure of the power brake system with ABS functionality is particularly simple if a conventional ABS control unit for low volume flows is used to control.
  • This ABS control unit can then be adapted with comparatively small changes to the requirements for power-brake systems which are operated, for example, as a rule with hydraulic oil and not with the usual brake fluid.
  • the continuously adjustable 3-way valve has a valve spool, which is biased by the above-mentioned spring in its basic position and has a cam, through the annular end faces in each case a control edge is formed.
  • the opening cross-section between the pressure connection and the brake connection on the one hand and between the brake connection and the tank connection on the other hand is determined via these control edges.
  • the pressure at the brake connection acts on a slide control surface via a detection channel, while said control pressure acts on the other slide control surface.
  • the signaling channel runs through the slider.
  • the spring is arranged in a rear control chamber, in which also the control pressure acts.
  • control edges of the valve slide are designed so that in an intermediate region between the working positions of the directional control valve, the opening cross sections between pressure port and brake port and tank port and brake port are shut off, so that the reversal can be done steadily.
  • the brake valve according to the claims 15 and 16 and independently of a manual operation of the brake pedal is automatically actuated. Then it gets into critical Driving conditions independent of an intervention of the driver, for example, for an electronic stability control against skidding or for anti-slip control build a brake pressure.
  • Figure 1 is a circuit diagram of a hydraulic 2-circuit power-brake system
  • Figure 2 is a hydraulic circuit symbol of a pilot-operated directional control valve of the power brake system of Figure 1;
  • FIG. 3 shows a section through a concrete solution of the directional control valve according to Figure 2;
  • Figure 5 shows a part of a power brake system with such a directional control valve
  • FIG. 6 shows a variant of the 2-circuit power-operated braking system from FIG. 1 that has been expanded to include further functionalities.
  • FIG. 1 shows a circuit diagram of a hydraulic power-brake system 1, for example, for a fast-running tractor, a dumper or a municipal vehicle.
  • This power brake system 1 consists essentially of a operated by a brake pedal 2 power brake valve, hereinafter called brake valve 4, two hydraulic accumulators 6, 8, a accumulator charging valve 10, a pump 12, an ABS control unit 14 and four relay valves 16, 18, 20, 22nd , via which in each case a wheel brake cylinder 26, 28, 30, 32 can be acted upon by a brake pressure.
  • brake valve 4 a brake pedal 2 power brake valve
  • two hydraulic accumulators 6, 8 a accumulator charging valve 10
  • pump 12 an ABS control unit 14
  • four relay valves 16 18, 20, 22nd via which in each case a wheel brake cylinder 26, 28, 30, 32 can be acted upon by a brake pressure.
  • the two Wheel brake cylinder 26, 28 of the front axle and the other two wheel brake cylinders 30, 32 associated with the rear axle.
  • the accumulator charging valve 10 has the task to keep a pressure level within certain limits in the memory circuit and has a pressure compensator 34, an adjustable Druckeinstellelement 36 and a check valve 38.
  • the pump 12 promotes the loading of the two hydraulic accumulators 6, 8 pressure medium in a storage supply line 40, the is connected to the input of an inverse shuttle valve 42. Wherein both outputs are connected via storage lines 44, 46 with storage ports S1 and S2 of the brake valve 4.
  • the hydraulic accumulators 6, 8 are connected to the storage line 44 and 46, respectively.
  • the pressure compensator 34 throttles the pump delivery flow until the pressure in the storage circuit overcomes the spring force of the pressure setting element 36. Upon reaching this preset pressure is via the pressure compensator a
  • the brake valve 4 is a standard valve, as described, for example, in the cited data sheet RD 66 226 / 06.00 or in the data sheet RD 66 146 / 10.03 of Bosch Rexroth AG.
  • Such a power brake valve has the two aforementioned memory ports S1, S2, a tank port T and each brake circuit associated brake ports BR1 and BR2.
  • Each relay valve 16, 18, 20, 22 has a brake port A, which is connected via a respective brake line 62, 64, 66 and 68 to the associated wheel brake cylinder 26, 28, 30, 32.
  • Each relay valve 16, 18, 20, 22 further has a tank connection T connected to the tank 70 and a control connection G which is connected to the ABS control unit 14 via a control line 72, 74, 76, 78.
  • the ABS control unit 14 is a modified product from the automotive sector. In this area, the brake systems are operated with a brake fluid, while in commercial vehicles usually the same pressure medium as in the working hydraulics is used. It should be noted that the elastomers commonly used to seal conventional ABS ECUs are not suitable for use with hydraulic oil.
  • ABS control unit 14 The basic structure of such an ABS control unit 14 is well known from the specialist literature. For example, reference is made to the textbook “Fachisme KraftGermantechnik", Europa Lehrstofftechnik, 25th edition 1994, pages 460.
  • Such ABS control units 14 usually have an electronic control unit, via which each wheel associated fast-switching ABS valves are controlled
  • a return pump is provided via which brake fluid is pumped into a line section between a master brake cylinder and the ABS valves in the automotive sector during the ABS control
  • a modification of the ABS control unit 14 is that this return pump is dispensed with and the seals
  • the ABS control unit 14 is not designed with its own, integrated pressure fluid reservoirs As can be seen from the illustration according to Figure 1, the inputs of the ABS control unit 14 to the two Rremsdruckleitun ⁇ en 50 52 an ⁇ esammlung .
  • FIG. 2 shows the circuit symbol of such a pilot-operated relay valve 16, 18, 20, 22, wherein the respective ABS valves, referred to below as pilot valves, are each integrated in the ABS control unit 14.
  • the basic structure of the relay valve 16 is exemplified.
  • the structure of the other relay valves is corresponding.
  • the relay valve 16 is based on a known construction, which is described in the aforementioned data sheet RD 66 226 / 06.00 or in the sheet RD 66 152 / 10.03 Bosch Rexroth AG.
  • the relay valve 16 is a proportionally adjustable Druckreduzierventil in 3-way design with the already described ports P, T and A.
  • the pressure port P is connected to the supply line 54 and the output or brake port A to the brake line 62.
  • a valve spool of the relay valve 16 is biased by a spring 80 in a basic position a, in which the pressure port P is connected to the output port A - the relay valve 16 is thus executed in the embodiment of Figure 1 as a normally open valve, wherein in the basic position of the pressure in the brake pressure lines 50, 52 is switched through to the wheel brake cylinders - with unconfirmed brake pedal 2, these brake pressure lines 50, 52, however, connected via the brake valve 4 to the tank 70.
  • the pressure in the brake line 62 or at the brake port A is tapped via a signaling channel 82 and acts on a control surface of the valve spool opposite to the force of the spring 80.
  • a Pilot valve 86 leads from the brake pressure line 50 or the supply line 54 further branches off a control channel 84, the input to the terminal P of a Pilot valve 86 leads. This is normally open and can be brought by energizing a solenoid 88 in a blocking position in which the pressure medium connection between the control channel 84 and a connected to the output terminal ⁇ of the pilot valve control line 72 is shut off. A pressure in the control line 72 acts as a control pressure on the valve spool of the relay valve 16 in the effective direction of the spring 80th
  • a pilot valve 90 is further connected, which is designed to be normally closed and can be brought by energizing a switching magnet 92 in an open position in which a connected to the control line 72 input terminal P with a connected to an output terminal A.
  • Tank control line 94 is connected, which opens into the tank 70.
  • both control surfaces of the relay valve 16 are subjected to the same pressure, so that assuming that both control surfaces have the same size, the valve spool of the relay valve 16 is pressure balanced. This is then biased by the force of the spring 80 in its basic position a.
  • Tank 70 is controlled, so that the control pressure in the control line 72 is relieved to the tank and according to the valve spool of the relay valve 16 is displaced by the pressure applied to the message channel 82 in the brake line 62 in the direction indicated by b position, wherein in an intermediate rule setting c, the pressure medium connections between the terminals A, P, T are first shut off via the control edges.
  • the output port A is connected to the tank port T, so that the brake pressure in the connected brake pipe 62 can be reduced.
  • valves 86, 90 By designed for the small control oil volume flows sufficiently large rapidly switching valves 86, 90 thus designed for a large pressure medium volume flow relay valve 16 can be reversed very fast to the brake pressure build-up or braking pressure reduction, by suitable control of the valves 86, 90, the desired brake pressure is adjusted , For example, the two pilot valves are alternately activated in each case for a short time, whereby a control pressure resulting from the ratio of the activation times, normalized to the pressure in the control channel 84, is fed into the control line 72.
  • other suitable actuators such as piezo actuators may be used.
  • the kauspilotelement 86 may also be formed by a nozzle, which makes it possible to lower the pressure in the control line 72 by pulsed opening of the pilot valve 90 or completely degrade by constantly opening for Bremstikabsenken.
  • the relay valve 16 has a valve housing 96, on which the terminals P, T and A and the control terminal G are formed.
  • a valve spool 100 is guided, which is designed approximately centrally with a control groove, at the annular end surfaces of which control grooves 102, 104 are formed, which determine the opening cross-sections between the terminals P, A and A, T in the control range, before marriage in the valve, a fluid path is fully open.
  • the output terminal A terminates in an output channel 106, the
  • Spring chamber 124 dips, in which the spring 80 is supported. This acts on the adjacent end portion of the valve slide 100, so that it is biased in its basic position against a housing 96 closing the end cap screw 125.
  • the control terminal G is connected to the above-described control line 72. Accordingly, in the basic position of the two pilot valves 86, 90 shown in FIG. 2, the valve slide 100 is pressure balanced, so that it is biased by the force of the spring 80 to the left into the stop position against the screw plug 125. In this basic position (a) in Figure 2, the pressure medium connection between the terminals P, A is opened and the pressure medium connection between the terminals A, T shut off.
  • Port A is open to T to release the brake pressure.
  • the valve spool is in the middle position executed with positive overlap.
  • the relay valves 16, 18, 20, 22 are normally open.
  • An exemplary embodiment is explained with reference to FIGS. 4 and 5, in which the relay valve is designed to be normally closed with respect to the pressure port P.
  • the circuit symbol of such a relay valve 16 is shown in FIG.
  • the valve construction is designed so that in the spring-biased home position (a) the brake or output port A is connected to the tank port T.
  • the adjustment of the relay valve 16 is a mirror image of the previously described embodiment, i. the pressure in the signaling channel 82 acts in the same direction as the spring 80, i. in the direction of the basic position (a).
  • the pressure in the control line 72 acts in the opposite direction.
  • the valve spool In the basic position of the pilot valve 86 and the pilot valve 90, the valve spool can be brought by pressure in the supply line 54 against the force of the spring 80 in the position (b) in the brake pressure build-up the pressure medium connection to the tank T shut off and the pressure medium connection between the pressure port P and the output terminal A is turned on.
  • the control line 72 is relieved to the tank 70, while the brake pressure in the brake line 62 further in the signaling channel 82 is applied - the valve spool of the relay valve 16 is then via the intermediate position (c) quickly in the direction of positions ( a) postponed.
  • Pressure build-up direction upstream of the connecting lines 136, 138 can throttles 140, 142; 144, 146 may be provided.
  • the pressure drop across the throttles 140, 142; 144, 146 detected and exploited to control the balance valves 132, 134.
  • Such compensating valves are known from the automotive sector, for example from WO 2004/016487 A1.
  • the variant of a power brake system according to Figure 6 is compared to the system of Figure 1 to an auxiliary pump 150, which is driven for example by an electric motor, not shown, an electromagnetically proportional adjustable pressure control valve 152 and an electronic control unit 154 added, of which the solenoid of the pressure control valve is controllable.
  • the pressure regulating valve is connected on the one hand to the pressure connection of the auxiliary pump 150 and to the tank 70 and on the other hand to its control connection to a control connection of the brake valve 4, which is a special embodiment of the brake valve 4 of FIG.
  • This special version of a brake valve is known per se from DE 103 25 875 A1 or US 2006/0097565 A1, FIGS. 2 and 3. Otherwise, the power-operated brake system according to FIG. 6 has the same components and fluid connections as the power-operated brake system according to FIG. 1.
  • an auxiliary pump 150 driving electric motor advantageously only turned on when the electronic control unit a critical driving condition is detected.

Landscapes

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

Abstract

L'invention concerne un système de frein à force extérieure hydraulique comportant une soupape de frein (4) actionnée manuellement, permettant de commander une connexion de fluide de pression entre une conduite de frein (BR1, BR2) et un circuit accumulateur (S1, S2) ou un réservoir (T; 70). Entre un cylindre de frein de roue (26-32) et la soupape de frein (4), la trajectoire d'écoulement de fluide de pression contient un distributeur précommandé (16-22), réglable en continu, pouvant être commandé au moyen de deux soupapes pilotes (86, 90).
EP08835897A 2007-10-05 2008-09-30 Système de frein à force extérieure hydraulique Withdrawn EP2197717A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007047640 2007-10-05
PCT/DE2008/001621 WO2009043343A1 (fr) 2007-10-05 2008-09-30 Système de frein à force extérieure hydraulique

Publications (1)

Publication Number Publication Date
EP2197717A1 true EP2197717A1 (fr) 2010-06-23

Family

ID=40348062

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08835897A Withdrawn EP2197717A1 (fr) 2007-10-05 2008-09-30 Système de frein à force extérieure hydraulique

Country Status (5)

Country Link
US (1) US20100187900A1 (fr)
EP (1) EP2197717A1 (fr)
CN (1) CN101815638A (fr)
DE (1) DE102008049551A1 (fr)
WO (1) WO2009043343A1 (fr)

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Publication number Priority date Publication date Assignee Title
GB0915310D0 (en) * 2009-09-03 2009-10-07 Agco Gmbh Power braking system
DE102010048403A1 (de) 2010-10-13 2012-04-19 Mali Spezialfahrzeugbau Gmbh Fremdkraftbremsanlage für ein Fahrzeug sowie Fahrzeug mit einer solchen Fremdkraftbremsanlage
CN102887148B (zh) * 2012-09-25 2016-07-13 三一重工股份有限公司 电控液压换向方法、系统及工程机械
DE102015003201A1 (de) * 2015-03-10 2016-09-15 Wabco Gmbh Hydraulische Bremsanlage
ITUB20155206A1 (it) * 2015-10-21 2017-04-21 Cnh Ind Italia Spa Veicolo motorizzato comprendente un freno di tipo SAHR.
DE102015015472A1 (de) 2015-11-28 2017-06-01 Wabco Gmbh Hydraulische Bremsanlage
US11052886B2 (en) 2019-09-20 2021-07-06 Caterpillar Inc. Hydraulic brake system with make-up line

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DE3427906A1 (de) * 1984-07-28 1986-01-30 Robert Bosch Gmbh, 7000 Stuttgart Steuerblock fuer die modulation des bremsdruckes in einer blockierschutz-einrichtung von kraftfahrzeugen
GB8803434D0 (en) * 1988-02-15 1988-03-16 Dewandre Co Ltd C Pilot operated hydraulic antilock modulator
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JPH0999832A (ja) * 1995-10-09 1997-04-15 Toyota Motor Corp 液圧ブレーキ装置
DE19859737A1 (de) * 1998-12-23 2000-06-29 Wabco Gmbh & Co Ohg Hydraulische Bremsanlage
JP2005535518A (ja) 2002-08-14 2005-11-24 コンティネンタル・テーベス・アクチエンゲゼルシヤフト・ウント・コンパニー・オッフェネ・ハンデルスゲゼルシヤフト 電気油圧式ブレーキシステムのエア抜きおよび再充填方法
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Also Published As

Publication number Publication date
WO2009043343A1 (fr) 2009-04-09
DE102008049551A1 (de) 2009-04-09
US20100187900A1 (en) 2010-07-29
CN101815638A (zh) 2010-08-25

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