GB1387120A - Digital type brake control device - Google Patents

Digital type brake control device

Info

Publication number
GB1387120A
GB1387120A GB2348474A GB2348474A GB1387120A GB 1387120 A GB1387120 A GB 1387120A GB 2348474 A GB2348474 A GB 2348474A GB 2348474 A GB2348474 A GB 2348474A GB 1387120 A GB1387120 A GB 1387120A
Authority
GB
United Kingdom
Prior art keywords
circuit
pulses
wheels
braking
pressure
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
GB2348474A
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.)
Aisin Corp
Original Assignee
Aisin Seiki Co 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
Priority claimed from JP12914170A external-priority patent/JPS5117665B1/ja
Application filed by Aisin Seiki Co Ltd filed Critical Aisin Seiki Co Ltd
Publication of GB1387120A publication Critical patent/GB1387120A/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
    • B60T8/1763—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

Abstract

1387120 Antiskid braking systems AISIN SEIKI KK 23 Dec 1971 [30 Dec 1970 (4)] 23484/74 Divided out of 1387119 Addition to 1364476 Heading F2F A digital antiskid brake control system for a vehicle hydraulic brake circuit comprises means for sensing the rotational speed of each of one or more wheels and producing a pulse signal representing that speed or the sum of those speeds, means for counting the numbers of pulses in two time periods, of which the second commences after the first, and subtracting the number of pulses in the second time period from that produced in the first to obtain the difference, means for subtracting a predetermined number from the difference to obtain a final number and means for relieving braking pressure when the final number is positive. The counting of pulses and obtaining of the difference is performed by an addition counter and a subtraction counter and the predetermined number is subtracted by supplying a pulse stream of a predetermined number of pulses, to the subtraction counter each time period, by means of a circuit including a gate circuit, input terminals of which are connected to output terminals of a control decoder. The predetermined number is varied in response to a pressure-responsive switch in the braking circuit, the number being higher for braking pressures above a set value than for those pressures below. A sensing circuit I delivers a pulse output representing the combined speeds of a pair of wheels to a circuit II including counters B1, B2 and connected to an addition/ subtraction circuit III. When the final count in the subtraction circuit is negative and is set into a flip-flop F37 no current flows through the solenoid V1 of the pressure relief circuit VII. When a slow or moderate brake action, insufficient to lock the wheels, is applied the final count is zero or negative and the pressure is not reduced but when a severe brake action is applied, the wheels being locked, the final count becomes positive and a current flows through the solenoid V1 to reduce braking pressure.
GB2348474A 1970-12-30 1971-12-23 Digital type brake control device Expired GB1387120A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP12913870 1970-12-30
JP12914070 1970-12-30
JP12914170A JPS5117665B1 (en) 1970-12-30 1970-12-30
JP12914270 1970-12-30

Publications (1)

Publication Number Publication Date
GB1387120A true GB1387120A (en) 1975-03-12

Family

ID=27471432

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2348474A Expired GB1387120A (en) 1970-12-30 1971-12-23 Digital type brake control device

Country Status (1)

Country Link
GB (1) GB1387120A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE31383E (en) 1975-12-06 1983-09-13 Teldix Gmbh Antilocking control system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE31383E (en) 1975-12-06 1983-09-13 Teldix Gmbh Antilocking control system

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees
PCPE Delete 'patent ceased' from journal

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