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:
Dec. 20, 2011
Filed:
Jan. 11, 2011
Ray F. Bowman, Carmel, IN (US);
Joseph A. Jaeger, Greenwood, IN (US);
Phillip J. Steffen, Avon, IN (US);
Robert G. Kiser, Indianapolis, IN (US);
Ray F. Bowman, Carmel, IN (US);
Joseph A. Jaeger, Greenwood, IN (US);
Phillip J. Steffen, Avon, IN (US);
Robert G. Kiser, Indianapolis, IN (US);
Rolls-Royce Corporation, Indianapolis, IN (US);
Abstract
One embodiment of the present application is a gas turbine engine with a compressor that includes a variable geometry mechanism to vary working fluid flow area. A desired state of this mechanism is selected different than a current state to change the amount of flow area. The mechanism has a hysteresis band corresponding to a difference between increasing the flow area to reach the desired state and decreasing the flow area to reach the desired state. To control operation of the mechanism within this hysteresis band, a determination is made whether the desired state corresponds to a greater flow area or a lesser flow area relative to the current state.