EP1509432A1 - Freins antiblocage pour vehicule a roues directrices - Google Patents

Freins antiblocage pour vehicule a roues directrices

Info

Publication number
EP1509432A1
EP1509432A1 EP03702723A EP03702723A EP1509432A1 EP 1509432 A1 EP1509432 A1 EP 1509432A1 EP 03702723 A EP03702723 A EP 03702723A EP 03702723 A EP03702723 A EP 03702723A EP 1509432 A1 EP1509432 A1 EP 1509432A1
Authority
EP
European Patent Office
Prior art keywords
axle
pressure
pressures
modulators
wheels
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Withdrawn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
EP03702723A
Other languages
German (de)
English (en)
Inventor
Colin Ross
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.)
Knorr Bremse Systeme fuer Schienenfahrzeuge GmbH
Knorr Bremse Systems for Commercial Vehicles Ltd
Original Assignee
Knorr Bremse Systeme fuer Schienenfahrzeuge GmbH
Knorr Bremse Systems for Commercial Vehicles Ltd
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 Knorr Bremse Systeme fuer Schienenfahrzeuge GmbH, Knorr Bremse Systems for Commercial Vehicles Ltd filed Critical Knorr Bremse Systeme fuer Schienenfahrzeuge GmbH
Publication of EP1509432A1 publication Critical patent/EP1509432A1/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Withdrawn legal-status Critical Current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
    • B60T8/349—Systems adapted to control a set of axles, e.g. tandem axles
    • 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
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/1701—Braking or traction control means specially adapted for particular types of vehicles
    • B60T8/1708—Braking or traction control means specially adapted for particular types of vehicles for lorries or tractor-trailer combinations

Definitions

  • This invention relates to an anti-lock braking system and an axle control valve for a vehicle with self-steerable wheels, especially but not exclusively a trailer vehicle with compressed air braking.
  • the invention is also applicable to a vehicle with force-steered wheels.
  • wheels of a self-steerable axle may be provided with means whereby when the vehicle is passing along a curved roadway, pivotal movement of the wheels of the steerable axle out of parallel with other wheels improves lateral stability and reduces tyre scrub.
  • Such steerable wheels may be on a rigid axle or suspended independently.
  • self-steerable wheels are provided with independent anti-lock control of their brakes the self- steer action, especially when being governed by wheel reaction forces with the roadway, can itself result in tyre wear and vehicle instability whilst an anti-lock mode is operating, due to differential braking forces and reactions at opposite wheels of the self-steerable axle.
  • European Patent No. 0754609 proposes an anti-skid compressed air braking system for a trailer vehicle with a common brake pressure modulator valve which responds to respective wheel-speed sensors at opposite sides of an allotted braked axle having anti-lock control via separate modulators, the common modulator providing the same brake pressure to both wheels of the self-steerable axle.
  • the present invention seeks to provide an alternative system to the foregoing and having an axle control valve not requiring such a common modulator.
  • an anti-lock braking system for a wheeled vehicle having a first axle with speed sensors for braked wheels thereof on opposite sides of the vehicle and a control unit (ECU) which controls fluid pressure modulators to selectively control the respective brake pressures applied to brakes of said wheels in the event of incipient skidding being sensed, the system including means for directly applying output fluid braking pressure from either or both said modulators to brakes of the wheels a further steerable axle of the vehicle and control means whereby at onset of an anti-lock mode accompanied by differential pressures from said modulators the higher of the braking pressures is isolated from the brakes of the steerable axle.
  • ECU control unit
  • a said control means is provided by an axle control valve with means to receive the respective output pressures of the brake pressure modulators and communicate them to a delivery port the axle control means including a pressure responsive assembly responsive to a pressure differential between the pressures to isolate the higher said output pressure from the delivery port.
  • the invention also provides an axle control valve comprising means to receive respective output pressures of brake pressure modulators for supply to a delivery port, said valve including means responsive to a pressure difference between said pressures to isolate the higher said pressure from the delivery port.
  • Fig 1 illustrates in schematic form interconnected components of a compressed air braking system of wheels of a trailer vehicle having three axles, one of which is a self-steered axle;
  • Fig 2 illustrates diagramatically the example of an axle control valve for the braking system of Fig 1;
  • FIG. 3 illustrates graphically operation of Fig 1 and Fig 2
  • the compressed air braking system of a two line trailer with electronic braking and anti-lock includes control and supply line couplers 1 and 2 respectively and a relay emergency valve 3 (of known form but which may be optional with EBS) via which a compressed air reservoir 4 is charged from a tractor system (not shown) .
  • the trailer has first, second and third axles with respective pairs of compressed air operable wheel brake actuators 12L, 12R and 13L, 13R and 14L, 14R.
  • the third axle is self-steered.
  • valve 3 Compressed air pressure graduable according to trailer control line pressure from the reservoir 4 is relayed via valve 3, a load control valve 5 (which again may not be a requirement with EBS) and respective left and right hand anti- lock pressure modulators 6L and 6R to the respective left and right hand brake actuators 12, 13.
  • the actuators 14L and 14R are brake actuators of the steered axle wheels which self-steer according to the reaction between the tyres thereof and the rolling surface to improve stability and minimise tyre wear.
  • 14L and 14R are normally supplied with substantially equal brake pressure via an axle control valve 15.
  • Valve 15 is supplied directly with pressures from both modulators 6L and LR.
  • these modulator pressures are controlled by an electronic ABS control unit (ECU) 16 which operates in known manner in response to wheel speed signals from transducers 17L and 17R adjacent to the middle pair of wheels which thereby sense the road surface adhesion at each side of the vehicle during braking.
  • ECU electronic ABS control unit
  • the modulators 6L and 6R apply equal load dependent brake pressures to actuators 12L, 13L and 12R, 13R, these equal pressures are also fed to the axle control valve 15 normally emerging at the output of valve 15 to actuators 14R and 14L.
  • the axle control valve 15 operates to isolate from actuators 14R and 14L the highest modulator output.
  • the axle control valve 15 comprises a housing 31 the interior volume of which is divided by a pressure responsive assembly 32.
  • the assembly 32 is normally in a neutral position to hold spring biased valve members 33, 34 at respective ends of the housing off their respective seats 35, 36.
  • the assembly is shown so deflected rightwards that valve member 33 is seated with seat 35 whereas valve member 34 is unseated from its seat 36.
  • the pressure responsive assembly comprises a central circular spacer 37 between opposed sides of which and respective circular end mouldings 38, 39 circular flexible diaphragms 40 and 41 of greater diameter are sealingly clamped and the peripheries of the spaced diaphragm are similarly sealingly clamped between opposed sides of a mounting bracket (which provides an annular central part 42 of the housing) and housing end mouldings 43,44.
  • These end mouldings include outwardly extending end regions 45, 46 with end covers which enclose the valve members 34 and 35 and light biasing springs 47 and 48.
  • Castellated ends 49 and 50 of the pressure responsive assembly respectively extend sealingly but axially moveable through interior housing wall portions into regions 45 and 46, to be engageable non-sealingly, for unseating action, with the valve members 33, 34. Regions 45 and 46 are however respectively continually in free connection with respective opposed sides of the assembly via passages 57, 56.
  • the moveable assembly also has an axial bore 51 and radial passages 52 via which bore 51 communicates with a delivery port 53 for the control valve.
  • curves (a) and (b) represent right and left side wheel speeds for the non-steered middle axle of the trailer vehicle following onset of braking at a point in time A. Following some speed reduction, a tendency to skid is observed at point B. At this point, the adhesion is assumed to be equal on both sides of the vehicle and the axle control valve therefore transmits similar co on pressures to the brake actuators as shown in the broken line curve (c) . Following wheel speed recovery at point C a further tendency for the middle axle wheels to skid again occurs at point D but with predominantly lower adhesion on the right hand side of the vehicle.
  • the resultant difference of output from the modulators 6L and 6R then causes the left hand modulator pressure to be isolated by the axle control valve from the direct delivery to both the actuators of the steerable axle, the brake pressure thereto being reduced towards that applied to the right side of the middle axle.
  • the steerable axle wheel speeds resulting from this are illustrated by the part of curve (d) which follows point in time D but it may be observed that the speed fluctuation here may be somewhat less for higher adhesion.
  • the modulator valve 6R of Fig 1 provides reduced pressure to the brake actuators 12R and 13R of the right hand wheels of the middle axle and first axle.
  • the reduction of pressure from modulator applied via port 55 results in movement of the assembly 32 towards the position shown in the Fig 2, resulting in the valve 33, 35 being seated to isolate the higher pressure (from modulator 6L) at port 54 from the delivery port.
  • the actuators may be provided with actuator pressure through a common delivery port and via a common quick release valve.
  • a common quick release valve may be integrated with an axle control valve unit according to the invention if so required.
  • axle control valve Whilst the axle control valve described in the foregoing with reference to Fig 2 of the accompanying drawings is described more especially in relation to anti-lock control of brakes of self-steerable axle brakes during anti-lock braking of a vehicle, such an axle control valve may be employed in force steerable arrangements. Moreover, such an axle control valve may be provided to afford a simplified anti-lock control of brake pressure of wheels of a lifting axle the tyres of wheels of which contact the rolling surface only when the vehicle is heavy-laden. By such means the size of actuators to one or more other axles may be less than otherwise required, whilst providing extended distribution of braking of the vehicle.

Landscapes

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

Abstract

L'invention concerne un système de freinage antiblocage destiné à une remorque de véhicule routier utilitaire à freins pneumatiques et comportant un essieu autodirecteur équipé de ces freins, dans lequel une unité de commande électronique (ECU) (16) commande de manière sélective les pressions de freinage correspondantes vers chaque côté d'un autre essieu de freinage en fonction de l'adhérence différentielle de la surface roulement pour réduire le dérapage par le biais de modulateurs (6L, 6R) de pression. L'application des pressions extérieures de ces modulateurs s'additionne directement par le biais d'une soupape de commande (15) d'essieu aux actionneurs de freins des roues de l'essieu autodirecteur, ladite soupape étant équipée de dispositif (Fig. 2) réagissant à un différentiel de pression entre les pressions de sortie des modulateurs pendant la commande antiblocage de façon à isoler la sortie la plus élevée desdites sorties de modulateur des freins de roues d'essieu autodirectrices, ce qui permet de fournir des pressions de freinage égales réduites aux roues autodirectrices correspondant à la pression de modulateur du côté de faible adhérence de l'autre essieu.
EP03702723A 2002-02-02 2003-02-03 Freins antiblocage pour vehicule a roues directrices Withdrawn EP1509432A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB0202484A GB2385645B (en) 2002-02-02 2002-02-02 Anti-lock braking for a vehicle with steerable wheels
GB0202484 2002-02-02
PCT/GB2003/000454 WO2003066402A1 (fr) 2002-02-02 2003-02-03 Freins antiblocage pour vehicule a roues directrices

Publications (1)

Publication Number Publication Date
EP1509432A1 true EP1509432A1 (fr) 2005-03-02

Family

ID=9930316

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03702723A Withdrawn EP1509432A1 (fr) 2002-02-02 2003-02-03 Freins antiblocage pour vehicule a roues directrices

Country Status (4)

Country Link
EP (1) EP1509432A1 (fr)
AU (1) AU2003205846A1 (fr)
GB (1) GB2385645B (fr)
WO (1) WO2003066402A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008003525C5 (de) * 2008-01-08 2012-12-13 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Bremseinrichtung eines wenigstens zweiachsigen, eine gelenkte Vorderachse aufweisenden Anhängerfahrzeugs einer Zugfahrzeug-Anhängerkombination
GB2475528A (en) * 2009-11-23 2011-05-25 Haldex Brake Products Ltd Trailer braking system having independently operable brakes on either side of the trailer
GB2597765A (en) * 2020-08-04 2022-02-09 Haldex Brake Prod Ab A braking system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3026254A1 (de) * 1980-07-11 1982-02-11 Wabco Fahrzeugbremsen Gmbh, 3000 Hannover Antiblockiersystem
DE3138834A1 (de) * 1981-01-21 1983-04-14 Wabco Westinghouse Fahrzeugbremsen GmbH, 3000 Hannover Antiblockiersystem, insbesondere fuer ein mehrachs-fahrzeug
DE3106640A1 (de) * 1981-02-23 1982-09-09 Wabco Fahrzeugbremsen Gmbh, 3000 Hannover Druckluftbremsanlage fuer luftgefederte drei- und mehrachs-strassenfahrzeuge
GB9514508D0 (en) * 1995-07-15 1995-09-13 Grau Ltd Anti-skid brake system
DE10026689B4 (de) * 2000-05-30 2006-03-30 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH ABS-Bremsanlage für Fahrzeuge mit einer Zusatzachse

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
MISCHKE A.: "Aufbau und Wirkung des Antiblockiersystems ABS fUEr Nutzfahrzeuge", ATZ AUTOMOBILTECHNISCHE ZEITSCHRIFT, vol. 83, no. 9, 1 September 1981 (1981-09-01), pages 439 - 446, XP002240739 *
See also references of WO03066402A1 *

Also Published As

Publication number Publication date
WO2003066402A1 (fr) 2003-08-14
GB2385645B (en) 2005-07-13
WO2003066402A8 (fr) 2003-11-06
AU2003205846A1 (en) 2003-09-02
WO2003066402A9 (fr) 2010-11-11
AU2003205846A8 (en) 2010-12-09
GB0202484D0 (en) 2002-03-20
GB2385645A (en) 2003-08-27

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