Method for monitoring performance of the lubricant cooler in aircraft auxiliary power unit
First Claim
1. A method for monitoring performance of an aircraft auxiliary power unit APU lubricant cooler, comprising:
- acquiring APU messages within a time period;
obtaining the operation parameters of the APU lubricant cooler according to the APU messages, the operation parameters including lubricant temperature OTA and load compressor inlet temperature LCIT;
obtaining a revised lubricant temperature OT by;
revised lubricant temperature OT=lubricant temperature OTA−
load compressor inlet temperature LCIT; and
determining whether the performance of the APU lubricant cooler is in stable phase, decline phase or malfunction phase according to change trend of the revised lubricant temperature OT with respect to time, the determining comprising;
in response to the change trend is less than a threshold value of decline, determining the performance of the APU lubricant cooler is in stable phase;
in response to the change trend is greater than the threshold value of decline and less than a threshold value of malfunction, determining the performance of the APU lubricant cooler is in decline phase; and
in response to the change trend is greater than the threshold value of malfunction, determining the performance of the APU lubricant cooler is in malfunction phase; and
determining stable change trend of the revised lubricant temperature OT with respect to time when the APU lubricant cooler is in stable phase;
wherein, the threshold value of the decline phase is around 1.5-2.5 times than the stable change trend, and the threshold value of malfunction is around 5-7 times than the stable change trend.
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Abstract
The present invention relates to a method for detecting performance of the lubricant cooler in aircraft auxiliary power unit APU, comprising: acquiring APU-related messages within a time period; obtaining the operation parameters of the APU lubricant cooler, the operation parameters comprise: lubricant temperature OT and load compressor inlet temperature LCIT; the revised lubricant temperature OT is obtained by the following formula: the revised lubricant temperature=lubricant temperature OTA−the load compressor inlet temperature LCIT; determining the performance of the APU lubricant cooler is in stable phase, decline phase or malfunction phase according to the change trend of the revised lubricant temperature OT with respect to time.
20 Citations
20 Claims
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1. A method for monitoring performance of an aircraft auxiliary power unit APU lubricant cooler, comprising:
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acquiring APU messages within a time period; obtaining the operation parameters of the APU lubricant cooler according to the APU messages, the operation parameters including lubricant temperature OTA and load compressor inlet temperature LCIT; obtaining a revised lubricant temperature OT by; revised lubricant temperature OT=lubricant temperature OTA−
load compressor inlet temperature LCIT; anddetermining whether the performance of the APU lubricant cooler is in stable phase, decline phase or malfunction phase according to change trend of the revised lubricant temperature OT with respect to time, the determining comprising; in response to the change trend is less than a threshold value of decline, determining the performance of the APU lubricant cooler is in stable phase; in response to the change trend is greater than the threshold value of decline and less than a threshold value of malfunction, determining the performance of the APU lubricant cooler is in decline phase; and in response to the change trend is greater than the threshold value of malfunction, determining the performance of the APU lubricant cooler is in malfunction phase; and determining stable change trend of the revised lubricant temperature OT with respect to time when the APU lubricant cooler is in stable phase; wherein, the threshold value of the decline phase is around 1.5-2.5 times than the stable change trend, and the threshold value of malfunction is around 5-7 times than the stable change trend. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A device for monitoring performance of a lubricant cooler in aircraft auxiliary power unit APU, comprising a processor and a memory for storing computer readable instructions for instructing the processor implementing the following units:
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a message acquiring and analyzing unit, configured to acquire APU messages within a time period, and obtain the operation parameters of the APU lubricant cooler, the operation parameters includes;
time since installation TSR of APU, lubricant temperature OTA and load compressor inlet temperature LCIT;a temperature revised unit, configured to obtain revised temperature of lubricant OT; revised temperature of lubricant OT=lubricant temperature OTA−
load compressor inlet temperature LCIT; anda performance monitoring unit, configured to determine that the performance of the APU lubricant cooler is in stable phase, decline phase, serious decline phase or malfunction phase according to change trend of the revised lubricant cooler OT against the time since installation (TSR) of APU determined by; in response to the change trend being less than a threshold value of decline, determining the performance of the APU lubricant cooler is in stable phase; in response to the change trend being greater than the threshold value of decline and less than a threshold value of malfunction, determining the performance of the APU lubricant cooler is in decline phase; and in response to the change trend being greater than the threshold value of malfunction, determining the performance of the APU lubricant cooler is in malfunction phase; and determining stable change trend of the revised lubricant temperature OT with respect to time when the APU lubricant cooler is in stable phase; wherein, the threshold value of the decline phase is around 1.5-2.5 times the stable change trend, and the threshold value of malfunction is around 5-7 times the stable change trend.
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20. A device for monitoring performance of a lubricant cooler in aircraft auxiliary power unit APU, comprising:
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a processor; and a memory linked with the processor, which stores computer-readable codes; the computer-readable codes run in the processor to execute the following steps; acquiring APU messages within a time period; obtaining the operation parameters of the APU lubricant cooler, the operation parameters includes;
time since installation TSR of APU, lubricant temperature OTA and load compressor inlet temperature LCIT;revised temperature of lubricant OT is obtained by; revised temperature of lubricant OT=lubricant temperature OTA−
load compressor inlet temperature LCIT;determining that the performance of the APU lubricant cooler is in stable phase, decline phase, serious decline phase or malfunction phase according to change trend of the revised lubricant cooler OT against the time since installation (TSR) of APU, the determining comprising; in response to the change trend being less than a threshold value of decline, determining the performance of the APU lubricant cooler is in stable phase; in response to the change trend being greater than the threshold value of decline and less than a threshold value of malfunction, determining the performance of the APU lubricant cooler is in decline phase; and in response to the change trend being greater than the threshold value of malfunction, determining the performance of the APU lubricant cooler is in malfunction phase; and determining stable change trend of the revised lubricant temperature OT with respect to time when the APU lubricant cooler is in stable phase; wherein, the threshold value of the decline phase is around 1.5-2.5 times the stable change trend, and the threshold value of malfunction is around 5-7 times the stable change trend.
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Specification