METHOD AND SYSTEM FOR MONITORING THE LEVEL OF OIL CONTAINED IN A TANK OF AN AIRCRAFT ENGINE

• US 20130218399A1
• Filed: 04/14/2011
• Published: 08/22/2013
• Est. Priority Date: 04/19/2010
• Status: Active Grant

• Current Assignee: Safran Aircraft Engine Company
• Original Assignee: Snecma (Safran SA)
• Inventors: Flandrois, Xavier, Masse, Jean-Remi, Ricordeau, Julien, Demaison, Francois, Massot, Gilles, Hmad, Ouadir
• Granted Patent: US 9,540,974 B2
• Time in Patent Office: Days
• US Class Current: 701/31.4
• CPC Class Codes: F01D 25/18 Lubricating arrangements of machines or engines in general F01M
• CPC Class Codes: F01M 11/12 concerning lubricant level
• CPC Class Codes: F05D 2260/80 Diagnostics

Abstract

A method of monitoring oil level in a tank of an aircraft engine, including: for at least two predetermined operating stages of the engine, during at least one mission of the aircraft: obtaining a plurality of measurements of an oil level of the tank, each measurement being associated with an oil temperature and with an engine speed of rotation, and selecting measurements representative of oil level variations and associated with oil temperatures that are close to a reference temperature and with engine speeds of rotation that are close to a reference speed of rotation; aggregating the measurements selected over the operating stages and during the at least one mission of the aircraft; and comparing the aggregated measurements with reference data to identify abnormal oil consumption of the engine.

Claims

1-13. -13. (canceled)

14. A method of monitoring a level of oil contained in a tank of an aircraft engine, the method comprising:

for at least two predetermined operating stages of the engine, during at least one mission of the aircraft;

obtaining a plurality of measurements of an oil level of the tank, each measurement being associated with an oil temperature and with an engine speed of rotation, and

selecting measurements representative of oil level variations and associated with oil temperatures that are close to a reference temperature and with engine speeds of rotation that are close to a reference speed of rotation;

aggregating the measurements selected over the operating stages and during the at least one mission of the aircraft; and

comparing the aggregated measurements with reference data to identify abnormal oil consumption of the engine.

15. A monitoring method according to claim 14, wherein the two predetermined operating stages of the engine correspond to a taxiing stage and to a cruising stage in the mission of the aircraft.

16. A monitoring method according to claim 14, wherein, when selecting measurements, measurements that are representative of oil level variations that appear over a duration shorter than a predetermined limit duration are excluded.

17. A monitoring method according to claim 14, wherein, when selecting measurements, oil level measurements greater than a predetermined limit oil level are excluded.

18. A monitoring method according to claim 14, wherein, when selecting measurements, measurements representative of oil level variations greater than a predetermined limit variation are excluded.

19. A monitoring method according to claim 14, wherein the aggregating the measurements includes detecting at least one filling of the tank between two successive missions of the aircraft.

20. A monitoring method according to claim 14, wherein the aggregating the measurements includes correcting at least one oil level measurement as a function of a difference that exists between the oil temperature associated with the measurement and the reference temperature.

21. A monitoring method according to claim 14, wherein the aggregating the measurements includes applying linear regression to the measurements.

22. A monitoring method according to claim 14, wherein the aggregated measurements are compared relative to a predetermined threshold representative of abnormal consumption of oil by the engine.

23. A monitoring method according to claim 14, wherein measurements are aggregated over a plurality of missions of the aircraft, and the aggregated measurements are compared with a reference curve representative of normal consumption of oil by the engine.

24. A monitoring method according to claim 14, wherein:

measurements are obtained and selected during the mission of the aircraft; and

measurements are aggregated and compared by a device on the ground to which the selected measurements have been sent.

25. A monitoring system for monitoring the oil level contained in a tank of an aeroengine, the system comprising:

means that are activated for at least two predetermined operating stages of the engine during at least one mission of the aircraft;

to obtain a plurality of measurements of an oil level of the tank, each measurement being associated with an oil temperature and with an engine speed of rotation, and

to select measurements representative of oil level variations, which measurements are associated with oil temperatures close to a reference temperature and with engine speeds of rotation that are close to a reference speed of rotation;

means for aggregating the measurements selected over the operating stages and during the at least one mission of the aircraft; and

means for comparing the aggregated measurements with reference data in order to identify abnormal oil consumption of the engine.

26. A monitoring system according to claim 25, wherein:

the means for obtaining a plurality of measurements and for selecting the measurements representative of oil level variations are on board the aircraft; and

the means for aggregating the selected measurements and for comparing the aggregated measurements with reference data are incorporated in a device on the ground;

the aircraft further including means for sending the selected measurements to the device on the ground.