GB2202017A - Anti-lock electric braking - Google Patents

Anti-lock electric braking Download PDF

Info

Publication number
GB2202017A
GB2202017A GB08705384A GB8705384A GB2202017A GB 2202017 A GB2202017 A GB 2202017A GB 08705384 A GB08705384 A GB 08705384A GB 8705384 A GB8705384 A GB 8705384A GB 2202017 A GB2202017 A GB 2202017A
Authority
GB
United Kingdom
Prior art keywords
braking system
lock braking
solenoid
rotating member
sensing coil
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.)
Pending
Application number
GB08705384A
Other versions
GB8705384D0 (en
Inventor
Alvan Michael Judson
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB08705384A priority Critical patent/GB2202017A/en
Publication of GB8705384D0 publication Critical patent/GB8705384D0/en
Publication of GB2202017A publication Critical patent/GB2202017A/en
Pending 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
    • B60T8/72—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 responsive to a difference between a speed condition, e.g. deceleration, and a fixed reference
    • B60T8/76—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 responsive to a difference between a speed condition, e.g. deceleration, and a fixed reference two or more sensing means from different wheels indicative of the same type of speed condition
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
    • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
    • G01P3/488—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by variable reluctance detectors

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

Abstract

An anti-lock braking system for electrically actuated brakes having an actuating solenoid utilises a winding of the solenoid as a sensing coil. Discontinuities (such as grooves, notches or disc brake ventilating holes) formed on a rotating member induce an alternating signal in the sensing coil representative of the rotational speed of the member. This signal can then be used to control the operation of the braking system.

Description

"Improvements in or relating to Anti-Lock Brakes" The present invention concerns anti-lock brakes for motor vehicles or the like wherein the braking force applied to each wheel is varied in accordance with the speed of rotation of the wheel.
Known anti-lock braking systems for hydraulically actuated brakes operate by monitoring the speed at which the individual wheels are rotating and automatically reducing the braking force applied to any wheel showing a tendency to lock (ie. the slowest wheel). The rotational speeds of the wheels are monitored by electrical sensors, the output signals from which are used to control the braking force applied to each wheel via an electrical/hydraulic interface. The sensors used are typically of the variably inductance, capacitance or reluctance type which co-operate with grooves, nothces, holes or projections on the rotating wheel to generate an alternating signal having a frequency which is a function of the speed of rotation of the wheel.Signals from the sensors on each wheel are integrated in a central processor on the vehicle which determines which wheel requires its braking effort to be regulated.
Such arrangements are necessarily complex, requiring separate sensing circuitry and brake actuating mechanisms. Furthermore, the electrical/hydraulic interface is relatively slow resulting in poor system response.
It is an object of the present invention to obviate or mitigate these disadvantages.
Accordingly, the invention provides an improved anti-lock braking arrangement for electrically actuated brakes wherein the brake mechanism is actuated by a solenoid, and wherein a winding of the brake actuating solenoid serves as the sensing coil for sensing the rotational speed of the wheel.
The sensing coil may be the energising winding of the solenoid itself or, alternatively, an additional sensing winding may be provided on the solenoid.
In the case of drum brakes, evenly spaced discontinuities such as grooves, nothces, holes or raised portions may be formed on a rotating portion of the hub or wheel to induce an alternating signal in the sensing coil, whilst in the case of disc brakes the existing ventilation holes in the rotating discs may serve this function.
A typical electrically actuated drum brake includes brake shoes which are actuated by an actuating mechanism operated by a solenoid located adjacent the axle of the vehicle and in close proximity to the hub or wheel mounted on the axle. Thus, by providing a series of evenly distributed discontinuities, such as grooves, notches, holes or raised portions on a part of the hub or wheel passing close to the solenoid, an alternating signal may be induced in a winding of the solenoid by the rotation of the wheel, the frequency of the signal being a function of the rotational speed of the wheel. This signal may be utilised to monitor and control the braking force applied to the wheel in a manner similar to existing anti-lock mechanisms.
The existing energising winding of the solenoid may itself be employed as a sensing coil in this manner or the solenoid may be provided with an additional sensing winding.
Such a dual function solenoid may also be used with disc brakes, in which case the ventilation holes provided on the rotating disc of many disc brake systems may serve as the discontinuities for inducing the speed signal in the solenoid.
The invention thus reduces the number of parts of an anti-lock system by eliminating the need for separate sensors, so reducing costs and increasing reliability. The system response time is also improved by eliminating the relatively slow hydraulic/electric interface.

Claims (9)

1. An anti-lock braking system for electrically actuated brakes wherein the brake mechanism is actuated by a solenoid, and wherein a winding of the brake actuating solenoid serves as a sensing coil for sensing the rotational speed of a rotating member.
2. An anti-lock braking system as claimed in claim 1 wherein said sensing coil is the energising winding of the solenoid.
3. An anti-lock braking system as claimed in claim 1 wherein said sensing coil comprises an additional winding on the solenoid.
4. An anti-lock braking system as claimed in any of claims 1 to 3 wherein a plurality of evenly spaced discontinuities are formed on the rotating member, whereby an alternating signal may be induced in the sensing coil.
5. An anti-lock braking system as claimed in claim 4 wherein said discontinuities comprise grooves, notches, holes or raised portions formed on said rotating member.
6. An anti-lock braking system as claimed in claim 4 or claim 5 wherein said rotating member is a hub or wheel of a motor vehicle.
7. An anti-lock braking system as claimed in claim 4 or claim 5 wherein said rotating member is a rotatable disc of a disc brake system and said discontinuities comprise ventilating holes formed in said disc.
8. An anti-lock braking system as claimed in any of claims 4 to 7, further including control means responsive to said signal and adapted to vary the braking force applied to the rotating member in response thereto.
9. An anti-lock braking system substantially as hereinbefore described.
GB08705384A 1987-03-07 1987-03-07 Anti-lock electric braking Pending GB2202017A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08705384A GB2202017A (en) 1987-03-07 1987-03-07 Anti-lock electric braking

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08705384A GB2202017A (en) 1987-03-07 1987-03-07 Anti-lock electric braking

Publications (2)

Publication Number Publication Date
GB8705384D0 GB8705384D0 (en) 1987-04-08
GB2202017A true GB2202017A (en) 1988-09-14

Family

ID=10613519

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08705384A Pending GB2202017A (en) 1987-03-07 1987-03-07 Anti-lock electric braking

Country Status (1)

Country Link
GB (1) GB2202017A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7090842B1 (en) * 1994-12-28 2006-08-15 Board Of Trustees Of The University Of Kentucky Murine monoclonal anti-idiotype antibody 3H1 sequences for human carcinoembryonic antigen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7090842B1 (en) * 1994-12-28 2006-08-15 Board Of Trustees Of The University Of Kentucky Murine monoclonal anti-idiotype antibody 3H1 sequences for human carcinoembryonic antigen

Also Published As

Publication number Publication date
GB8705384D0 (en) 1987-04-08

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