Method and apparatus for monitoring turbine efficiency of aircraft auxiliary power unit
US9696239B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 23, 2014 |
| Grant date | Jul 4, 2017 |
| Priority date | — |
| Expiry date | Feb 12, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T50/60
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.