Hamilton Sundstrand Corporation

Jay H Hartman

Jeffry K Kamenetz

Erin G Kline

John M Maljanian

Jay W Kokas

Gregory DiVincenzo

Mark A Johnston

Kevin P Roy

Gregory Di Vincenzo

James Joyce

William Betterini

Luke T Orsini

Steven R Fischer

Gregory Divincenzo

Luke J Orsini

An aircraft environmental control system (ECS) includes a first valve that is adjustable between a plurality of first positions to open or shut-off a bleed air flow that flows from an inlet of the first valve to an outlet of the first valve. A second valve includes an inlet in fluid communication with the first valve outlet, and is adjustable between a plurality of second positions to throttle the bleed air that flows from the inlet of the second valve to an outlet of the second valve. A valve position sensor outputs a position signal indicating a measured position among the plurality of second positions. A controller is in signal communication with the valve position sensor. The controller is configured to determine a primary effective area of the second valve based on the measured position, and to diagnose operation of the first valve based on the primary effective area.

Aircraft environmental control system including valve built-in-test without position feedback

An electronic control configuration includes at least one secondary microprocessor operable to control a device. The at least one secondary microprocessor assumes protection control of the device responsive to a first type of failure by transmitting a protection control signal to a first effector. The at least one secondary microprocessor assumes backup control of the device responsive to a second type of failure by transmitting a backup control signal to a second effector. The backup control functionality of the at least one secondary microprocessor can be selectively disabled.

Architecture using integrated backup control and protection hardware

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Willington, CT, United States of America

Jay H Hartman