Method and system for diagnoses and prognoses of low temperature limit control valve
First Claim
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1. A method, comprising:
- during operation of an environmental control system (ECS) for a vehicle, sensing current operation parameters related to the ECS;
retrieving historical operation parameters related to the ECS; and
determining a probability of below-specified performance of a low temperature limit valve of the ECS, based on a predetermined relationship between the sensed current operation parameters and the probability of below-specified performance, wherein the predetermined relationship is based on the current operation parameters, the historical operation parameters, and the probability of below-specified performance of the low temperature limit valve.
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Abstract
Method and apparatus for determining a probability of below-specified performance of a low temperature limit control valve. During operation of an environmental control system (ECS) for a vehicle, current operation parameters related to the ECS are sensed. Historical operation parameters related to the ECS are retrieved. A probability of below-specified performance of the low temperature limit control valve is determined based on a predetermined relationship between the stored current operation parameters, the historical operation parameters, and the probability of below-specified performance of the low temperature limit valve.
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Citations
20 Claims
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1. A method, comprising:
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during operation of an environmental control system (ECS) for a vehicle, sensing current operation parameters related to the ECS; retrieving historical operation parameters related to the ECS; and determining a probability of below-specified performance of a low temperature limit valve of the ECS, based on a predetermined relationship between the sensed current operation parameters and the probability of below-specified performance, wherein the predetermined relationship is based on the current operation parameters, the historical operation parameters, and the probability of below-specified performance of the low temperature limit valve. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An environmental control system (ECS) for a vehicle, comprising:
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a first duct arranged to supply cold air from a cold air source; a second duct arranged to supply warm air from a warm air source; a junction where the first duct and the second duct intersect, wherein the junction includes an output duct that outputs a mixture of the cold air and the warm air; a low temperature limit valve arranged in the second duct, wherein the low temperature limit valve is operable to control flow of the warm air from the warm air source; a valve position sensor arranged relative to the low temperature limit valve, wherein the valve position sensor is operable detect a position of the low temperature limit valve; a first pressure sensor operable to detect an air pressure downstream of the low temperature limit valve; a first temperature sensor operable to detect an air temperature downstream of the low temperature limit valve; and a valve controller operable to; send valve position commands to the low temperature limit valve, based on the temperature detected by the first temperature sensor; and sense current operation parameters related to the low temperature limit valve, wherein the current operation parameters include commanded positions of the low temperature limit valve, detected positions of the low temperature limit valve, and detected pressures detected by the first pressure sensor at different sample times. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An aircraft, comprising:
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an aircraft cabin adapted to be pressurized; a gas turbine engine, wherein the gas turbine engine includes at least one engine bleed; an environmental control system (ECS) operable to receive bleed air from the at least one engine bleed and to provide conditioned air to the aircraft cabin, the ECS including; a first duct arranged to supply cold air from a cold air source; a second duct arranged to supply warm air from a warm air source; a junction where the first duct and the second duct intersect, wherein the junction includes an output duct that outputs a mixture of the cold air and the warm air; a low temperature limit valve arranged in the second duct, wherein the low temperature limit valve is operable to control flow of the warm air from the warm air source; a valve position sensor arranged relative to the low temperature limit valve, wherein the valve position sensor is operable detect a position of the low temperature limit valve; a first pressure sensor operable to detect an air pressure downstream of the low temperature limit valve; a first temperature sensor operable to detect an air temperature downstream of the low temperature limit valve; and a valve controller operable to; send valve position commands to the low temperature limit valve, based on a detected temperature of the mixture of the cold air and the warm air in the output duct of the junction; and sense current operation parameters related to the low temperature limit valve, wherein the current operation parameters include commanded positions of the low temperature limit valve, detected positions of the low temperature limit valve, and detected pressures detected by the first pressure sensor at different sample times. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification