Vehicle antiskid brake control system having means for adjusting

Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal

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303113, B60T 1368

Patent

active

040933172

ABSTRACT:
An antiskid brake control system in which an electronic evaluation circuit subject to dynamic behavior signals produced by a wheel sensor associated with one wheel of an axle controls modulator valve device in the brake cylinder fluid pressure conduit to adjust the brake cylinder pressure at the sensed wheel as well as at the non-sensed wheel of the axle independently of an operator controlled brake valve device. There is provided in alternate arrangements of the invention an electrical delay element via which either the supply or exhaust valve comprising the modulator valve device associated with the non-sensed wheel is controlled so that the non-sensed wheel brake pressure development is inhibited relative to the sensed wheel brake pressure to provide better stability of the non-sensed wheel. Another arrangement provides an electrical delay element via which the exhaust valve comprising the modulator valve device of the sensed wheel is controlled so as to inhibit the exhaust of brake pressure therefrom while the non-sensed wheel brake pressure is reduced in the usual manner under control of the evaluation device when a wheel skid condition of the sensed wheel is detected. As an alternative to the electrical delay elements in these arrangements, there may be provided a fluid pressure flow restrictor in the appropriate brake cylinder conduit, with the direction of restricted flow being controlled by a one-way check valve.

REFERENCES:
patent: 3467444 (1969-09-01), Leiber
patent: 3819236 (1974-06-01), Fink et al.
patent: 3843207 (1974-10-01), Syria
patent: 3926477 (1975-12-01), Klatt
patent: 3980346 (1976-09-01), Leiber

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