US 3,937,526 AGranted

Single valve braking system having anti-skid control

AssigneeGoodyear Aerospace Corporation

InventorEdgar J. Ruof

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Abstract

An anti-skid and brake control system for use on an aircraft wherein the output signals from standard anti-skid circuitry are combined with the signals from a brake pedal transducer to create braking signals. The braking signals are applied to current controlled hydraulic valves for regulation of the application and release of brake pressure. The brakes utilized are dual cavity brakes with corresponding cavities of all brakes being interconnected to the same hydraulic line. Shut-off valves are interposed in the hydraulic lines and are operative to enable the brake valves to regulate brake pressure when either brake pedal of the aircraft has been depressed a fixed amount. Biasing circuitry is presented to affect the brake signal in such a manner as to overcome a dead band within the response characteristics of the brake valves utilized.

Claims6

Dependent claims

An anti-skid system and brake control device for use on a vehicle having at least two wheels and having anti-skid circuitry connected to brakes on each of said wheels for producing anti-skid signals indicative of skidding activity and further having brake pedals connected to brake pedal transducers for producing pedal force signals indicative of the degree of brake pedal depression, comprising:

rectifiers connected to the transducers for producing a DC signal from the associated pedal signals;
differencing circuits connected to the rectifiers and anti-skid circuits for producing brake signals indicative of the difference between the pedal force and anti-skid signals;
current controlled brake valve means connected to brakes on each of said wheels;
valve driver circuit means interconnected between said differencing circuit and said brake valve means for regulating the application and release of brake pressure according to said brake signals;
and
wherein said brakes are dual cavity brakes, having first and second cavities, and a first hydraulic line interconnecting the first cavity of all brakes with a hydraulic pressure source, and a second hydraulic line interconnecting the second cavity of all brakes with said hydraulic pressure source, each hydraulic line having a shut-off valve positioned between said hydraulic pressure source and the respective cavities, and further including threshold detection circuit means interconnected between said rectifiers and the shut-off valves for effecting the application of hydraulic pressure to the brake cavities when either of the brake pedals is depressed beyond a particular amount.

3 more elements

Dependencies are inferred from the claim text.