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:
Nov. 20, 2012
Filed:
Oct. 12, 2006
Wayne Hurwitz, West Hartford, CT (US);
Glenn Levasseur, Colchester, CT (US);
Wayne Hurwitz, West Hartford, CT (US);
Glenn Levasseur, Colchester, CT (US);
United Technologies Corporation, Hartford, CT (US);
Abstract
(A) A turbofan engine control system is provided for managing a fan operating line. The engine () includes a spool having a turbine housed in a core nacelle (). A turbofan () is coupled to the spool (). A fan nacelle () surrounds the turbofan and core nacelle and provides a bypass flow path having a nozzle exit area (). A controller () is programmed to effectively change the nozzle exit area in response to an undesired turbofan stability margin which may result in a stall or flutter condition. In one example, the physical nozzle exit area is increased at the undesired stability condition in which the airflow into the engine creates a destabilizing pressure gradient at the inlet side of the turbofan. A turbofan pressure ratio, turbofan pressure gradient, low spool speed and throttle position are monitored to determine the undesired turbofan stability margin.