A bleed leakage detection system includes an arrangement of thermostats that are capable of detecting the place where the bleed air leakage is occurring (e.g., the failed junction in bleed air duct work). The exemplary illustrative non-limiting implementation provides a bleed leakage detection syste
A bleed leakage detection system includes an arrangement of thermostats that are capable of detecting the place where the bleed air leakage is occurring (e.g., the failed junction in bleed air duct work). The exemplary illustrative non-limiting implementation provides a bleed leakage detection system with continuous monitoring of thermostat sensor wiring during flight and thermostat self-test function (“Initiated Built In Test”—“IBIT”). The IBIT self-testing can be initiated before the aircraft takes off or optionally, during periodic self testing that may be run during predetermined periods such as overnight when the aircraft is not being flown. By the continuous monitoring the pilot is alerted when a bleed leakage has occurred or when the bleed leakage detection system has failed.
대표청구항▼
1. A method of detecting bleed air leakage onboard an aircraft comprising: measuring voltage or current associated with a plurality of disparately-located temperature-sensitive elements connected in electrical series, each of said temperature-sensitive elements having an electrical resistance associ
1. A method of detecting bleed air leakage onboard an aircraft comprising: measuring voltage or current associated with a plurality of disparately-located temperature-sensitive elements connected in electrical series, each of said temperature-sensitive elements having an electrical resistance associated therewith, the plurality of disparately-located temperature-sensitive elements comprising a first series-connected temperature sensitive element and a second series-connected temperature-sensitive element, the first series-connected temperature-sensitive element having a first test heater located in proximity thereto;upon being heated by the first test heater, said first series-connected temperature-sensitive element selectively activating, after a delay time sufficient to test responsivity of the first temperature-sensitive element to heating by the first test heater, a second test heater located in proximity to the second series-connected temperature-sensitive element;detecting bleed air leakage by analyzing said measured voltage or current to determine whether at least one of said temperature-sensitive elements has indicated abnormally high temperature; andconditioned on said analysis, selectively providing an alert and/or operating a shutoff valve to at least reduce further bleed air leakage. 2. The method of claim 1 further including displaying a warning indication in response to detection of bleed air leakage. 3. The method of claim 1 further including detecting, in response to said analysis, whether said series-connected temperature-sensitive elements have abnormally open-circuited. 4. The method of claim 1 further including intentionally heating each of said temperature-sensitive elements and detecting responsive voltage or current changes to verify that said elements are operating properly. 5. The method of claim 1, wherein at least some of said temperature-sensitive elements upon being heated, operate to electrically actuate said heating devices associated with different ones of said temperature-sensitive elements. 6. The method of claim 1 further including using the heating of a sequence of at least some of said temperature-sensitive elements to analyze said voltage or current to confirm proper operation thereof. 7. The method of claim 1 wherein said temperature-sensitive elements comprise bi-metallic switching elements. 8. The method of claim 1 wherein said temperature-sensitive elements comprise thermistors. 9. The method of claim 1 wherein the first series-connected temperature-sensitive element includes a thermostatic test heater actuator. 10. The method of claim 1 wherein each of said temperature-sensitive elements has a different test heater associated therewith, the first test heater associated with the first temperature-sensitive element being operative to heat the first temperature-sensitive-element said first temperature-sensitive element being connected to supply current, after a delay time sufficient to test the first temperature-sensitive element's response to the heat, to the second test heater associated with the second temperature-sensitive element. 11. A system for detecting bleed air leakage onboard an aircraft comprising: a plurality of disparately-located temperature-sensitive devices electrically connected in series, at least some of the devices disposed at or near bleed air ducts, each of said temperature-sensitive devices having an electrical resistance associated therewith;an electrical measuring circuit connected to said series-connected disparately-located plurality of temperature-sensitive devices, said measuring circuit being configured to measure the voltage or current associated with said plurality of disparately-located temperature-sensitive devices and analyzing said measured voltage or current to determine whether at least one of said devices indicates abnormally high temperature;at least one output device connected to said circuit, said output device changing state in response to detection that at least one of said devices indicates abnormally high temperature attributable to leakage of hot bleed air, anda plurality of testing heating devices co-located with said respective plurality of disparately-located temperature-sensitive devices, said testing heating devices generating heat in response to electrical current flowing therethrough, to expose said temperature-sensitive devices to test heating,a first of said series-connected temperature-sensitive devices having a first testing heating device located in proximity thereto, said first series-connected temperature-sensitive device being configured to, upon being heated by the first testing heating device, selectively activate, after a delay time sufficient to test responsivity of the first temperature-sensitive device to heating by the first testing heating device, a second test heating device located in proximity to a second of said series-connected temperature-sensitive devices different from said first temperature-sensitive device. 12. The system of claim 11 wherein said output device comprises an alert indicator. 13. The system of claim 11 wherein said output device comprises a shutoff valve that is operated in response to detection that at least one of said devices has actuated indicating abnormally high temperature, to prevent further bleed air leakage. 14. The system of claim 11 wherein said temperature-sensitive devices comprise temperature sensitive switches. 15. The system of claim 11 wherein said temperature-sensitive devices comprise thermistors.
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이 특허에 인용된 특허 (14)
Scherer, Thomas; Schmidt, Ruediger; Solntsev, Alexander, Air supply for an aircraft.
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