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. 21, 2002
Filed:
Mar. 17, 2000
Jean-Marie Brocard, Rubelles, FR;
Alain Pierre Garassino, Crisenoy, FR;
Christian Denis Le Boeuf, Brunoy, FR;
Alain Patrick Paya, Le Chatelet en Brie, FR;
Alain Michel Varizat, Bois le Roi, FR;
SNECMA Moteurs, Paris, FR;
Abstract
A hydraulic fuel control unit ( ) for an aircraft engine comprises means ( ) for controlling cutoff on stop and cutoff on overspeed of a fuel flow transferred by an output ( ) to the engine injectors. A logic module ( ) controls the position of a state switch ( ) into a test position or a normal position. The state module is managed such that the operation of the overspeed module can be tested each time the system is started on the ground. The architecture of the hydraulic unit ( ) is such that operation of the cutoff on stop can be tested during each landing. Correct operation in the overspeed test and in the cutoff on stop test is observed by detecting a difference between a control value ( ) of an allowable fuel flow that depends mainly on the engine speed, and a real flow value detected by sensors ( ).