Antiskid brake control for aircraft

Fluid-pressure and analogous brake systems – Pipeless valves

Patent

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Details

244111, 303106, 303110, B60T 802

Patent

active

043279481

ABSTRACT:
An antiskid brake control wherein sensitive deceleration detectors present output signals to a valve driver for releasing brake pressure. The deceleration detector output is also passed to a modulator which acts as a memory circuit to keep the average brake pressure near the skid level and also provides for a controlled reapplication of brake pressure following the release. A constant current discharge circuit is connected to the modulator to provide a linear discharge of the modulator capacitor. A fast recovery circuit is interconnected between the deceleration detector and modulator to rapidly discharge the modulator capacitor in the event that no outputs from the deceleration detector have been sensed for a predetermined period of time. The control system includes gain control circuitry to provide for at least three distinct system gains. Also provided as a portion of the invention is touchdown protection circuitry which holds brake pressure off when the aircraft is in the air and for a fixed time period following touchdown, unless the wheels have spun-up past a predetermined rotational speed. Such circuitry further controls reapplication of the antiskid system to the braking effort following a bounce of the braked wheels.

REFERENCES:
patent: 3724902 (1973-04-01), Ruof
patent: 3880475 (1975-04-01), Booher
patent: 3966266 (1976-06-01), Atkins

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