Method for monitoring performance of the lubricant cooler in aircraft auxiliary power unit
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United States of America Patent
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Jun 27, 2017
Grant Date -
Aug 11, 2016
app pub date -
Jul 23, 2014
filing date -
Jul 24, 2013
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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.
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