Sub-idle speed control apparatus for an airplane turbine engine

Details Sub-idle speed control apparatus for an airplane turbine engine Sub-idle speed control apparatus for an airplane turbine engine

1983-10-17

1985-09-17

Casaregola, Louis J.

Power plants

Combustion products used as motive fluid

Combined with regulation of power output feature

F02C 928

Patent

active

045412375

ABSTRACT:
A sub-idle speed control apparatus for reducing the thrust of an airplane turbine engine is provided. The subject invention reduces the compressor discharge pressure measured by an existing pressure sensing means which proportionally reduces the fuel flow to the engine. Hence, the engine speed is reduced resulting in a lower engine thrust. A switch activates the apparatus which closes a normally open valve in the existing pressure line between the compressor and the pressure sensing means and diverts the pressure through a by-pass line having a restrictor. The by-pass line is connected to the existing pressure line on the compressor side and the pressure sensing side of the normally open valve. A normally closed valve and a spring loaded valve respectively are connected to the existing pressure line and the by-pass line at the connection point nearest the pressure sensing means. When the apparatus is activated the normally closed valve is opened simultaneously with the closing of the normally open valve. The spring loaded valve maintains the flow of pressure through the restrictor which acts to reduce the pressure flowing through the restrictor and thus reducing the pressure measured by the pressure sensing means.

REFERENCES:
patent: 4424666 (1984-01-01), Woody
patent: 4444008 (1984-04-01), Cantwell

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