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:
Mar. 04, 2014
Filed:
Jul. 27, 2010
Ian A. Griffin, Sheffield, GB;
Arthur L. Rowe, Derby, GB;
Ian A. Griffin, Sheffield, GB;
Arthur L. Rowe, Derby, GB;
Rolls-Royce PLC, London, GB;
Abstract
The present invention relates to control of engine variable of a gas turbine engine to regulate the surge margins of at least two compressors. A controller () receives data measured from engine sensors () and uses said data to determine an indication of surge margin for each of at least two compressors () of the gas turbine engine. The controller () uses the indications of surge margin for each of the compressors to determine a control strategy that balances the requirements of each compressor. In one embodiment a surge margin operating map divided into different control domains () is used. The indication of surge margin determined for each compressor is plotted to determine which control domains the current operating point on the surge margin operating map falls within. The invention is particularly suited to control binary bleed valves associated with the compressors and the position of the current operating point in a control domain and/or the time spent in the operating domain can be used to determine how many of the binary valves should be opened or closed.