Antiskid brake controlling method and apparatus for vehicles

Details Antiskid brake controlling method and apparatus for vehicles Antiskid brake controlling method and apparatus for vehicles

1981-05-06

1983-07-26

Truhe, J. V.

Boots, shoes, and leggings

303106, 303105, 303 99, B60T 802

Patent

active

043957617

ABSTRACT:
An antiskid brake controlling method and apparatus comprising: comparing by a first comparator and during braking of a vehicle, a wheel speed signal V.sub.w representative of the peripheral speed of a wheel of the vehicle with a first reference wheel speed signal V.sub.R 1 less than a vehicle speed signal V.sub.E and with a second reference wheel speed signal V.sub.R 2 which is less than the first reference wheel speed signal V.sub.R 1; comparing by a second comparator a wheel acceleration signal V.sub.w representative of the peripheral acceleration of the wheel with a first reference wheel acceleration signal V.sub.wl representing a predetermined positive peripheral acceleration of the wheel, a second reference wheel acceleration signal V.sub.w2 greater than the first reference wheel acceleration signal and a reference wheel deceleration signal -V.sub.w3 representative of a predetermined negative peripheral acceleration of the wheel. The comparators are connected through an electrical circuit to solenoids of control valves which regulate flow of pressure fluid to a wheel brake cylinder for selectively counteracting the pressure of brake fluid from a master cylinder to the brake cylinder or maintaining constant pressure in the brake cylinder. The electrical circuit is operative to decrease the braking torque T.sub.B from an instant at which the wheel acceleration signal V.sub.w has dropped below the reference wheel deceleration signal -V.sub.w3 when the wheel speed signal V.sub.w is less than the first reference wheel speed signal V.sub.R 1 but greater than the second reference wheel speed signal V.sub.R 2; to stop the decrease of the braking torque T.sub.B after the wheel acceleration signal V.sub.w comes to increase again, at an instant at which the wheel acceleration signal V.sub.w exceeds the reference wheel deceleration signal -V.sub.w3 ; and also to decrease the braking torque T.sub.B until the wheel acceleration signal V.sub.w increases to exceed the first reference wheel acceleration signal V.sub.wl when the wheel speed signal V.sub.w has dropped below the second reference wheel speed signal V.sub.R 2.

REFERENCES:
patent: 3556610 (1971-01-01), Leifer
patent: 3820857 (1974-06-01), Schnaibel et al.
patent: 4036536 (1977-07-01), Quon

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