Method and apparatus for monitoring turbine efficiency of aircraft auxiliary power unit
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United States of America Patent
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Jul 4, 2017
Grant Date -
Jul 7, 2016
app pub date -
Jul 23, 2014
filing date -
Jul 24, 2013
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Abstract
The present invention relates to a method and device for monitoring performance of an auxiliary power unit (APU) turbine efficiency of an aircraft. The method comprises: obtaining APU messages at multiple time points within a period; obtaining APU startup parameters including at least a rotation speed at a peak of EGT according to the APU messages; calculating a percentage NPA of the rotation speed when the exhausting gas temperature EGT reaches its peak at the APU startup stage relative to the rotation speed in the APU normal operation; calculating the average of the NPA within the period; and determining which of the stable, decline and failure phases the APU turbine efficiency is in according to the average of the NPA.
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