GB1347976A - Anti-skid braking systems - Google Patents

Anti-skid braking systems

Info

Publication number
GB1347976A
GB1347976A GB1347976DA GB1347976A GB 1347976 A GB1347976 A GB 1347976A GB 1347976D A GB1347976D A GB 1347976DA GB 1347976 A GB1347976 A GB 1347976A
Authority
GB
United Kingdom
Prior art keywords
signal
diode
valve
transistor
amplifier
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
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.)
Girling Ltd
Original Assignee
Girling 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 Girling Ltd filed Critical Girling Ltd
Publication of GB1347976A publication Critical patent/GB1347976A/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
    • B60T8/17—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

Landscapes

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

Abstract

1347976 Antiskid braking systems GIRLING Ltd 23 July 1971 [9 Sept 1970] 43116/70 Heading F2F In an antiskid braking system for a vehicle wheel speed, tachogenerators 11, 12 feed signals to frequency-to-voltage converters 13, 14 the outputs of which pass to a switch 15 which emits a signal to the remainder of the circuit of the signal from the slowest rotating wheel and two differentiating circuits producing signals responsive respectively to deceleration and acceleration receive the signal from switch 15 to relieve and apply the brakes through valve 64. The first differentiating circuit includes a PNP transistor 18 having its emitter connected through a capacitor 16 to switch 15 and is further connected through a diode 19 to a positive supply line 21, to a negative line 25 through resistor 26 and diode 27 and to the base of an NPN transistor 28. When the brakes are applied the first differentiating circuit produces at the emitter of transistor 28 a signal representing deceleration which is fed by way of a diode 35 to amplifier 56, 62 which forces current to flow in valve 64. As deceleration increases more current flows in valve 64 so that the braking effort is relieved. The second differentiating circuit comprises a capacitor 17 and NPN transistor 36 the collector of which is connected to the base of an NPN transistor having its collector connected to a further positive supply line 32 and its emitter connected to the base of an NPN transistor 26. As the braking effort is relieved the second differentiating circuit produces an output at the emitter of a transistor 46 representative of wheel acceleration which is amplified and inverted by an amplifier 49 provided with negative feedback through a resistor 54 and also applied to amplifier 56, 62. A signal now appears through a diode 34 to control amplifier 56, 62 and cause current to flow through valve 64. Because of the signal inversion greater acceleration produces a greater signal through diode 34. Capacitors 22, 23 counteract temperature variations.
GB1347976D 1970-09-09 1971-07-23 Anti-skid braking systems Expired GB1347976A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4311670 1970-09-09

Publications (1)

Publication Number Publication Date
GB1347976A true GB1347976A (en) 1974-02-27

Family

ID=10427392

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1347976D Expired GB1347976A (en) 1970-09-09 1971-07-23 Anti-skid braking systems

Country Status (5)

Country Link
AU (1) AU3183371A (en)
DE (1) DE2144868A1 (en)
ES (1) ES395390A1 (en)
FR (1) FR2106392B1 (en)
GB (1) GB1347976A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD270820A3 (en) * 1987-02-12 1989-08-16 Berliner Bremsenwerk Veb METHOD FOR REGULATING THE BRAKE INTENSITY ON RAIL VEHICLES

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1270385A (en) * 1968-05-22 1972-04-12 Girling Ltd Sensing circuit for use in vehicle braking systems
US3554612A (en) * 1968-08-21 1971-01-12 Gen Motors Corp Antilock brake control

Also Published As

Publication number Publication date
DE2144868A1 (en) 1973-07-19
ES395390A1 (en) 1974-10-16
FR2106392A1 (en) 1972-05-05
AU3183371A (en) 1973-02-01
FR2106392B1 (en) 1974-03-29

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee