WO1989005252A1 - Systemes de regulation de la chasse des roues d'un vehicule - Google Patents

Systemes de regulation de la chasse des roues d'un vehicule Download PDF

Info

Publication number
WO1989005252A1
WO1989005252A1 PCT/GB1988/001031 GB8801031W WO8905252A1 WO 1989005252 A1 WO1989005252 A1 WO 1989005252A1 GB 8801031 W GB8801031 W GB 8801031W WO 8905252 A1 WO8905252 A1 WO 8905252A1
Authority
WO
WIPO (PCT)
Prior art keywords
wheel
piston
vehicle
brake
wheelspin
Prior art date
Application number
PCT/GB1988/001031
Other languages
English (en)
Inventor
Alastair John Young
Original Assignee
Automotive Products Plc
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 Automotive Products Plc filed Critical Automotive Products Plc
Publication of WO1989005252A1 publication Critical patent/WO1989005252A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • 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
    • B60T8/4208—Debooster systems
    • B60T8/4225—Debooster systems having a fluid actuated expansion unit
    • B60T8/4241—Debooster systems having a fluid actuated expansion unit pneumatically
    • B60T8/425—Debooster systems having a fluid actuated expansion unit pneumatically using a vacuum
    • 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
    • B60T8/175—Brake regulation specially adapted to prevent excessive wheel spin during vehicle acceleration, e.g. for traction control
    • 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
    • B60T8/4208—Debooster systems
    • B60T8/4225—Debooster systems having a fluid actuated expansion unit
    • B60T8/4233—Debooster systems having a fluid actuated expansion unit with brake pressure relief by introducing fluid pressure into the expansion 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
    • B60T8/48—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
    • 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
    • B60T2270/00—Further aspects of brake control systems not otherwise provided for
    • B60T2270/20—ASR control systems
    • B60T2270/203—ASR control systems hydraulic system components

Definitions

  • the present invention relates to vehicle wheelspin control systems.
  • a vehicle wheelspin control system includes a fluid pressure operated brake associated with a first wheel of the vehicle, wheelspeed sensors associated with said first wheel and a second v/heel of the vehicle, control means for comparing the speed of the first wheel with that of the second wheel and means for applying the brake associated with the first wheel when the speed of the first wheel exceeds the speed of the second wheel by more than a predetermined value characterised in that the brake effort applied to the first wheel is maintained at a level required to keep the first v/heel spinning at a predetermined speed above that of the second wheel.
  • the pressure of fluid applied to the brake associated with the first wheel and hence the braking effort applied to the wheel is proportional to the speed differential of the first and second wheels so that the pressure of brake fluid is maintained at a level required to keep the first wheel spinning at a predetermined speed above that of the second v/heel, until recovery of traction will cause the speed differential to fall below the predetermined value, when the control means will act to reduce the pressure of fluid applied to the brake.
  • a vehicle wheelspin control system includes a fluid pressure operated brake associated with a. first wheel of the vehicle, a brake control servo is connected between the brake associated with the first wheel and a source of fluid, said servo including a piston and cylinder assembly, the cylinder being connected to the source of fluid and to the brake actuator, valve means being provided to close the connection with the source of fluid and means being provided to selectively control the valve means and movement of the piston, so that fluid may be displaced from the cylinder into the brake actuator of the brake associated with the first wheel, thereby applying the brake, means being provided for comparing the speed of said first wheel with that of a second wheel and controling the servo to apply the brake associated with the first wheel when the speed of the first wheel exceeds that of the second wheel by more than a predetermined value characterised in that the valve means comprises a valve member which is mounted in the cylinder for axial movement thereof, said valve member being arranged initially to move with the piston to close the connection to the source of fluid, relative movement between
  • the wheelspin control will preferably be provided on each driven wheel.
  • the speed of each driven wheel may be compared with that of another driven wheel, for example a driven wheel on the same axle, or to the speed of a non-driven wheel.
  • the brakes used for the wheelspin control system are the normal service brakes of the vehicle.
  • the wheelspin control system may alternatively be independent of the normal braking system of the vehicle, separate brakes and hydraulic circuits being provided for this purpose.
  • FIG. 1 illustrates a vacuum operated wheelspin control circuit in accordance with the present invention.
  • FIG 2 illustrates a vacuum operated wheelspin control brake servo used in the circuit illustrated in figure 1;
  • Figure 3 illustrates a power hydraulic wheelspin control circuit in accordance with the present invention.
  • Figure 4 illustrates a power hydraulic wheelspin control brake servo used in the circuit illustrated in figure 3.
  • Figure 1 illustrates a wheelspin control circuit for a two wheel drive vehicle, the circuit being incorporated in the normal service brake circuit of the vehicle.
  • the components and arrangement of components for each wheel are identical and are denoted by similar reference numerals.
  • Each of the driven wheels is provided with a disc brake 11, 11' , the " caliper 12, 12' of which is connected to the brake circuit by line 13, 13'.
  • a control servo 14, 14' is provided in each line 13, 13'.
  • control servos 14 and 14' each have a cylinder 15 with stepped bore 16.
  • the larger diameter portion 17 of the bore 16 is closed and has an inlet 18 and outlet 19.
  • a piston 20 is slidingly sealed in the smaller diameter portion 21 of bore 16.
  • a valve member 22 is slidingly located within the larger diameter portion 17 of the bore
  • a stem 23 on valve member 22 being slidingly located in an axial bore 24 in piston 20, so that the piston 20 is movable axially relative to the valve member 22.
  • a cylindrical skirt formation 25 extends from the outer periphery of valve member 22, coaxial with stem 23 and an inwardly directed flange 26 on the end of skirt formation 25 remote from the valve member 22 engages over an enlarged diameter head portion 27 on the piston 20, so that the valve member 22 is captive on the piston 20.
  • a compression spring 30 acts between the head portion 27 of piston 20 and valve member 22 to urge the valve member 22 away from the piston 20, the expansion of spring 30 being limited by engagement of flange 26 with head portion 27.
  • An elastomeric seat formation 31 is provided on the valve member 22 coaxial with and opposed to the inlet 18 and spring means 32 acts between the closed end of cylinder 15 and the valve member 22 to urge the seat formation away from inlet 18, so that when piston 20 is fully retracted and the flange 26 on skirt 25 engages the shoulder between portions 17 and 21 of bore 16, the seat formation 31 will be clear of inlet 18.
  • a casing 40 is mounted coaxially of the cylinder 15 adjacent to the open end of the small diameter portion 21 of the bore 16 thereof.
  • the casing 40 is formed from two pressings 41 and 42 which are joined together at their outer peripheries, the outer periphery 43 of a diaphragm 44 being trapped therebetween to locate the diaphragm 44 and to seal the joint between the pressings 41 and 42.
  • a piston 45 is located within the casing 40, the inner periphery 46 of the diapnragm 44 being secured to the piston 45 to divide the casing 40 into two chambers 47 and 48.
  • the piston 45 has a stem 49 which is coaxial with cylinder 15 and extends into engagement with the piston 20, a diaphragm 50 providing a seal between the stem 49 and casing 40.
  • a compression spring 51 acts between the end of casing 40 adjacent cylinder 15 and the piston 45 to urge the piston 45 away from the cylinder 15.
  • Inlet/outlet ports 52 and 53 are provided to the chambers 47 and 48 respectively.
  • control servos 14, 14' are connected into the service brake lines 13, 13' so that inlet 18 is connected to the service brake circuit while outlet 19 is connected to the caliper 12, 12'.
  • the port 53 from chamber 48 of each servo 14, 14' is connected to a vacuum reservoir 60 which in turn is connected to the engine manifold via non return valve 61.
  • Port 52 of each servo 14, 14' is connected to a proportional pressure control solenoid valve 65, 65'.
  • the proportional pressure control valves 65, 65' are of conventional design each having a first port 66 which is connected to the vacuum reservoir 60 and a second port 67 which is open to atmosphere.
  • a spool valve which is under control of a solenoid actuator 68 selectively connects ports 66 and 67 to port 69 which is connected to port 52 of the servo 14, 14'.
  • Port 69 is connected to a chamber at the end of the spool valve, so that the pressure in the line between port 69 and servo 14, 14' acts on the end of the spool valve and is balanced against the force applied by the solenoid actuator 68.
  • the force supplied by the solenoid actuator 6b is proportional to the energising current
  • the pressure applied to chamber 47 of servo 14, 14' may be varied by varying the energising current.
  • Wheel speed sensors in the form of toothed wheels 70, 70' with electromagnetic pickups 71, 71' are provided on both driven wheels. These wheel speed sensors provide a signal which alternates at a frequency proportional to the rotational speed of the wheel with which they are associated. These wheel speed sensors may be shared with an antilock braking system if incorporated in the service brake circuit.
  • the signals from the wheel speed sensors are fed to an electronic processing unit 100 which will compare the signals and, if the signals show a speed differential in excess of a predetermined value, will produce an anologue control signal proportional to the speed differential above the predetermined value, to energise the solenoid valve 65, 65' associated with the faster wheel.
  • the pressure increase in the chamber 47 is controlled by solenoid valve 65, so that the resulting pressure applied to the brake caliper 12 will be sufficient .to reduce the speed differential of the wheels to a predetermined level. If the service brake is applied during this operation, excess pressure from the service brake circuit will move the valve member 22 against the spring 30 thus reopening connection between the service brake circuit and caliper 12 so that normal braking will occur.
  • the brake servo 80 is of similar construction to the vacuum operated brake servo 14 and operates in similar manner. However instead of the vacuum actuator, pressurised fluid is applied directly to the end of piston 20 which is remote from the valve member 22. In order to achieve this, the end of the cylinder remote from inlet 18 is also closed and provided with an inlet 81. Port 69 of proportional valve 65 is then connected to inlet 81 while port 66 is connected to a drain 83 and port 67 is connected to a pressure fluid accumulator 84. Fluid is supplied under pressure to the accumulator 84 from a reservoir 85 by means of pump 86, via a non return valve 87.
  • Figure 4 also illustrates an alternative manner of limiting extension of spring 30, so that the spring 32 will hold the inlet 18 open when .the piston 20 is fully retracted.
  • the spring 30 is located between the valve member 22 and a washer 90 which abuts an enlarged diameter portion 91 on the stem 23.
  • the washer 90 is abutted by the end of piston 20 so that relative movement between piston 20 and valve member 22 is permitted once the spring 32 is compressed and seat 31 engages the end wall of the cylinder 15, the enlarged portion 91 of stem 23 sliding within the axial bore 24 in piston 20.
  • wheelspin control systems are incorporated in the normal service brake system of the vehicle, they may alternatively form independent systems, in which case the inlets 18 of servos 14, 14' or 80, 80' would be connected to a fluid reservoir rather than to the service brake circuit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Regulating Braking Force (AREA)

Abstract

Le système décrit, qui sert à réguler la chasse des roues d'un véhicule, comprend un frein (11) actionné par la pression d'un fluide et associé à une première roue du véhicule, un détecteur de vitesse de roue (70' 71) associé à la première roue et un détecteur de vitesse de roue (70'; 71') associé à une seconde roue du véhicule, une unité de commande (100) servant à comparer la vitesse de la première roue avec la vitesse de la seconde roue, et une servocommande de frein (14) destinée à actionner le frein (11) associé à la première roue lorsque la vitesse de la premièe roue dépasse la vitesse de la seconde roue au-delà d'une valeur prédéterminée, la force de freinage s'exerçant sur la première roue étant maintenue à un niveau requis, de façon à maintenir la rotation de la première roue à une vitesse prédéterminée supérieure à la vitesse de la seconde roue sous la commande de l'unité de commande (100).
PCT/GB1988/001031 1987-12-10 1988-11-28 Systemes de regulation de la chasse des roues d'un vehicule WO1989005252A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB878728890A GB8728890D0 (en) 1987-12-10 1987-12-10 Vehicle wheelspin control systems
GB8728890 1987-12-10

Publications (1)

Publication Number Publication Date
WO1989005252A1 true WO1989005252A1 (fr) 1989-06-15

Family

ID=10628308

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1988/001031 WO1989005252A1 (fr) 1987-12-10 1988-11-28 Systemes de regulation de la chasse des roues d'un vehicule

Country Status (2)

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GB (1) GB8728890D0 (fr)
WO (1) WO1989005252A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109291901A (zh) * 2017-07-25 2019-02-01 罗伯特·博世有限公司 制动功能性

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3006137A1 (de) * 1980-02-19 1981-08-20 Daimler-Benz Ag, 7000 Stuttgart Hydraulische ein- oder mehrkreis-bremsanlage
EP0133380A2 (fr) * 1983-08-09 1985-02-20 Nippondenso Co., Ltd. Commande antidéparage à compensation de différence de vitesse de roue
DE3446063A1 (de) * 1984-12-18 1986-06-26 Alfred Teves Gmbh, 6000 Frankfurt Schlupfgeregelte bremsanlage fuer kraftfahrzeuge
WO1987002948A1 (fr) * 1985-11-16 1987-05-21 Robert Bosch Gmbh Systeme de regulation du glissement dans une transmission
WO1987005870A1 (fr) * 1986-03-31 1987-10-08 Caterpillar Inc. Appareil et procede de commande antipatinage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3006137A1 (de) * 1980-02-19 1981-08-20 Daimler-Benz Ag, 7000 Stuttgart Hydraulische ein- oder mehrkreis-bremsanlage
EP0133380A2 (fr) * 1983-08-09 1985-02-20 Nippondenso Co., Ltd. Commande antidéparage à compensation de différence de vitesse de roue
DE3446063A1 (de) * 1984-12-18 1986-06-26 Alfred Teves Gmbh, 6000 Frankfurt Schlupfgeregelte bremsanlage fuer kraftfahrzeuge
WO1987002948A1 (fr) * 1985-11-16 1987-05-21 Robert Bosch Gmbh Systeme de regulation du glissement dans une transmission
WO1987005870A1 (fr) * 1986-03-31 1987-10-08 Caterpillar Inc. Appareil et procede de commande antipatinage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109291901A (zh) * 2017-07-25 2019-02-01 罗伯特·博世有限公司 制动功能性

Also Published As

Publication number Publication date
GB8728890D0 (en) 1988-01-27

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