GB1394329A - Vehicle braking systems - Google Patents

Vehicle braking systems

Info

Publication number
GB1394329A
GB1394329A GB2781373A GB2781373A GB1394329A GB 1394329 A GB1394329 A GB 1394329A GB 2781373 A GB2781373 A GB 2781373A GB 2781373 A GB2781373 A GB 2781373A GB 1394329 A GB1394329 A GB 1394329A
Authority
GB
United Kingdom
Prior art keywords
signal
comparator
wheel
output
speed
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.)
Expired
Application number
GB2781373A
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.)
Automobiles Citroen SA
Original Assignee
Automobiles Citroen SA
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 Automobiles Citroen SA filed Critical Automobiles Citroen SA
Publication of GB1394329A publication Critical patent/GB1394329A/en
Expired 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
    • B60T8/3615—Electromagnetic valves specially adapted for anti-lock brake and traction control systems
    • B60T8/3655—Continuously controlled electromagnetic valves
    • B60T8/366—Valve details
    • B60T8/3665—Sliding valves
    • 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
    • B60T8/176—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS
    • B60T8/1761—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS responsive to wheel or brake dynamics, e.g. wheel slip, wheel acceleration or rate of change of brake fluid pressure
    • B60T8/17613—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS responsive to wheel or brake dynamics, e.g. wheel slip, wheel acceleration or rate of change of brake fluid pressure based on analogue circuits or digital circuits comprised of discrete electronic elements
    • 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
    • B60T8/176—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS
    • B60T8/1763—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS responsive to the coefficient of friction between the wheels and the ground surface
    • B60T8/17633—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS responsive to the coefficient of friction between the wheels and the ground surface based on analogue circuits or digital circuits comprised of discrete electronic elements
    • 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

Landscapes

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

Abstract

1394329 Antiskid braking systems AUTOMOBILES CITROEN SA 12 June 1973 [13 June 1972] 27813/73 Heading F2F Antiskid braking apparatus comprises means for producing an electrical signal representing at each instant the difference between the speed of a wheel and the speed this wheel would have if the slip had a predetermined value and an electrically operated valve 5a or 5b responsive to the signal to reduce braking pressure, the signal being differentiated and integrated and a fraction of the differentiated signal and a fraction of the integrated signal together with the initial signal being summed to obtain an error signal which is used to control the valve to keep wheel slip below the predetermined value, the integrated signal being taken into account only when the value of this signal tends to increase the error signal. A magnetic pickup 27a... 27d arranged close to a wheel supplies pules, of which the frequency depends on wheel speed, to a frequency-voltage converter 28a...28d, the converters being connected to a comparator 29 which determines which wheel has the highest speed and applies a signal to a memory unit 31 the output of which is applied to a generator 32 which multiplies the signal by a factor between 0À7 and 0À8 and supplies a reference speed. Comparator 29 also supplies second signals representing the slowest of the front and rear wheels to comparators 33a, 33b the output of comparator 33a being supplied to generator 32 to produce a signal representing the difference between the reference speed and that of the more slowly rotating front wheel. The output of comparator 33a is connected to a differentiating circuit 34a and an integrating circuit 35a the signals multiplied by coefficients Kd and K i being added by adder 36a to the signal from comparator 33a. An error signal E is produced at the output of adder 36a which is connected to one input of a comparator 38a having its other input connected to a sawtooth voltage generator 37 and its output connected to the input of a flip-flop 39a whose output is in turn connected to the control winding 24 of a brake pressure modulating valve 5a via an amplifier 40a so that the presence of an error signal causes the valve 5a to produce a braking pressure drop according to the amount of wheel slip. Comparator 33b is connected via a similar circuit to a valve 5b.
GB2781373A 1972-06-13 1973-06-12 Vehicle braking systems Expired GB1394329A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7221685A FR2201995B1 (en) 1972-06-13 1972-06-13

Publications (1)

Publication Number Publication Date
GB1394329A true GB1394329A (en) 1975-05-14

Family

ID=9100282

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2781373A Expired GB1394329A (en) 1972-06-13 1973-06-12 Vehicle braking systems

Country Status (4)

Country Link
DE (1) DE2328229A1 (en)
FR (1) FR2201995B1 (en)
GB (1) GB1394329A (en)
IT (1) IT984677B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2135413A (en) * 1983-02-25 1984-08-30 Teves Gmbh Alfred Improvements in brake force distribution
GB2137709A (en) * 1983-04-07 1984-10-10 Teves Gmbh Alfred Wheel slip control in a brake system for automotive vehicles

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2401709C2 (en) * 1974-01-15 1983-08-18 Krauss-Maffei AG, 8000 München Device for slip control of vehicle wheels
FR2467749A1 (en) * 1979-10-16 1981-04-30 Messier Hispano Sa IMPROVEMENTS TO BRAKING REGULATION SYSTEMS FOR VEHICLES, ESPECIALLY FOR AERODYNES
DE3240275A1 (en) * 1982-10-30 1984-05-03 Robert Bosch Gmbh, 7000 Stuttgart Device for load-dependent braking force control
DE4034839C1 (en) * 1990-11-02 1992-03-19 Manfred 2300 Kiel De Schlaupitz

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1169021A (en) * 1956-02-20 1958-12-19 Robertshaw Fulton Controls Co Control device with parallel elements
NL292055A (en) * 1962-04-27 1900-01-01
US3245727A (en) * 1962-08-15 1966-04-12 Crane Co Anti-skid brake control system
FR1553476A (en) * 1967-02-11 1969-01-10
US3503653A (en) * 1967-03-13 1970-03-31 Eaton Yale & Towne Velocity sensing anti-skid braking system
US3554612A (en) * 1968-08-21 1971-01-12 Gen Motors Corp Antilock brake control
US3604760A (en) * 1969-03-24 1971-09-14 Kelsey Hayes Co Skid control system
US3614173A (en) * 1969-06-27 1971-10-19 Bendix Corp Slip command skid control

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2135413A (en) * 1983-02-25 1984-08-30 Teves Gmbh Alfred Improvements in brake force distribution
GB2137709A (en) * 1983-04-07 1984-10-10 Teves Gmbh Alfred Wheel slip control in a brake system for automotive vehicles
US4699436A (en) * 1983-04-07 1987-10-13 Itt Industries, Inc. Brake system for automotive vehicles

Also Published As

Publication number Publication date
DE2328229A1 (en) 1974-01-03
FR2201995B1 (en) 1976-10-29
FR2201995A1 (en) 1974-05-03
DE2328229C2 (en) 1987-03-26
IT984677B (en) 1974-11-20

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee