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:
Aug. 12, 2008
Filed:
Nov. 24, 2006
Paul A. Flint, Derby, GB;
Paul A. Flint, Derby, GB;
Rolls-Royce plc, London, GB;
Abstract
The present invention is a method of monitoring the health of a fuel systemof a gas turbine engine. The fuel systemcomprising a fuel-metering valve, a hydraulic control valve servo pressure lineand a control pressure line. The fuel-metering valve comprises a hydraulic control valve solenoidfor metering the flow of fuel and a fuel filterand, in use, a current is applied to the solenoidto control the required fuel demand to fuel nozzles. The method comprises the steps of; measuring either the percentage difference between fuel metering valve demand and actual positions or the percentage difference in pressure between the servo pressure lineand the control pressure line, comparing the differential to a predetermined level, when that predetermined level is reached a warning is given. Thereby the engine may be scheduled for service before unsatisfactory performance of the fuel system is experienced.