The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 19, 2015
Filed:
Dec. 03, 2012
Snecma, Paris, FR;
Jean-Remi Andre Masse, Moissy-Cramayel Cedex, FR;
Benjamin Pierre Lamoureux, Moissy-Cramayel Cedex, FR;
Hicham Janati Idrissi, Longjumeau, FR;
Francis Marquisseau, Bourg la Reine, FR;
Aziz Sif, Vigneux sur Seine, FR;
SNECMA, Paris, FR;
Abstract
A method for monitoring a control device of a fuel metering valve of an aircraft turbojet engine, the control device supplying a control current to a servo valve in order to modify the position of the fuel metering valve. The method includes determining the position of the fuel metering valve during a flight of the aircraft, determining the travelling speed of the fuel metering valve, and determining the control current when the travelling speed of the fuel metering valve is zero. A mean control current is calculated when the travelling speed of the fuel metering valve is zero, the mean control current forming an indicator of deterioration of the control device. The deterioration indicator is compared with a reference base of indicators with deterioration so as to infer the type of deterioration from it, and an abnormality score is calculated for the deterioration indicator. The abnormality score is compared with a decision threshold of abnormality characteristic of the type of deterioration, and an alarm is released in case of violation of the decision threshold of abnormality.