Fuel systems for gas turbine engines

Details Fuel systems for gas turbine engines Fuel systems for gas turbine engines

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F02C 9/28 (2006.01) F02C 9/32 (2006.01)

Patent

CA 1149910

ABSTRACT OF THE DISCLOSURE A gas turbine engine fuel control for a main hydro- mechanical 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 NL or NH 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 in- creases when a certain error threshold is exceeded. The com- bination of phase advance and non-linear amplification ensures rapid limitation of speed without introducing stability problems.

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