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. 06, 1983
Filed:
Sep. 17, 1980
Michael J Joby, Solihull, GB;
Lucas Industries Limited, Birmingham, GB;
Abstract
A gas turbine engine fuel control has a main hydromechanical fuel flow control and an electrically operable valve in series with the flow control for speed limitation purposes. The valve is controlled by a signal N.sub.L or N.sub.H derived from an engine speed transducer. A phase advance compensation circuit advances the phase of the transducer signal and its output is applied to an error amplifier which compares it with a datum (which may vary with altitude). The error signal is applied to a non-linear amplifier the amplification factor of which increases when a certain error threshold is exceeded. The combination of phase advance and non-linear amplification ensures rapid limitation of speed without introducing stability problems.