Power plants – Combustion products used as motive fluid – Combined with regulation of power output feature
Patent
1980-09-17
1983-12-06
Casaregola, L. J.
Power plants
Combustion products used as motive fluid
Combined with regulation of power output feature
F02C 928
Patent
active
044185294
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.
REFERENCES:
patent: 3045426 (1962-07-01), Brahm
patent: 3082954 (1963-03-01), Offner
patent: 3686859 (1972-08-01), White
patent: 3739250 (1973-06-01), Beadman
patent: 4018044 (1977-04-01), Joby et al.
patent: 4188781 (1980-02-01), Johnson et al.
patent: 4217754 (1980-08-01), Schmidt-Roedenbeck
Casaregola L. J.
Lucas Industries Limited
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