Digital closed loop proportional hydraulic pressure controller

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United States of America Patent

PATENT NO 9387522
SERIAL NO

14225574

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Abstract

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A digitally controlled current to pressure converter (CPC) and method of controlling same is provided. The method of controlling includes the step of periodically imparting symmetrically-opposed movement of a control valve of the CPC to loosen and flush accumulated silt therefrom. More particularly, the method may include the step of periodically introducing a small-amplitude symmetrically-opposed impulse to a controller that actuates a hydraulic control shaft of a three-way rotary valve. Also provided is a method of preventing malfunction due to faulty input or feedback signals received by the CPC, and a method of detecting the health status of multiple CPCs when used in a redundant configuration.

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Patent Owner(s)

Patent OwnerAddress
WOODWARD INC1000 EAST DRAKE ROAD FORT COLLINS CO 80525

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Greeb, Kevin E Fort Collins, US 12 85

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