Vehicle wheel brake anti-lock system with low speed control

Details Vehicle wheel brake anti-lock system with low speed control Vehicle wheel brake anti-lock system with low speed control

1982-06-18

1985-03-12

Chin, Gary

Boots, shoes, and leggings

303 96, 303109, B60T 802

Patent

active

045049114

ABSTRACT:
To extend the range of automatic control of a brake anti-lock system, wheel speeds (V.sub.R1 -V.sub.R4) are processed and changed into control signals (12, 15) controlling braking effort of the vehicle. A first predetermined vehicle reference speed (V.sub.REF) is provided, and compared with a computed or actual vehicle speed. If the computed or actual vehicle speed drops below the first reference level (V.sub.REF1), a transfer switch (25) changes over control of the braking pressure control unit (22) from the standard control unit (23) to an auxiliary or additional branch (26) which initially maintains braking pressure, but drops braking pressure if the wheel speed of an individual wheel drops below a minimum level (V.sub.min) and the actual vehicle speed is above a second reference level (V.sub.REF2), which second reference level is below the first reference level (V.sub.REF1). The second reference level (V.sub.REF2) corresponds to a speed in excess of the minimum (V.sub.min).

REFERENCES:
patent: 3993363 (1976-11-01), Skoyles et al.
patent: 4078845 (1978-03-01), Amberg et al.
patent: 4180223 (1979-12-01), Amberg
patent: 4285042 (1981-08-01), Ohmori et al.
patent: 4374421 (1983-02-01), Leiber
patent: 4395761 (1983-07-01), Sato et al.
patent: 4420191 (1983-12-01), Arikawa et al.
patent: 4435768 (1984-03-01), Arikawa
patent: 4446522 (1984-05-01), Sato et al.

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