Engine thrust control system

Details Engine thrust control system Engine thrust control system

1978-11-03

1981-02-03

Garrett, Robert E.

Power plants

Reaction motor

Condition responsive thrust varying means

F02K 306, F02C 908

Patent

active

042480426

ABSTRACT:
A control system and method for utilizing the rotational speed of the high-speed spool in a multi-spool turbofan engine to stabilize changes in engine operation which affect the thrust output of the engine. Signals representing the actual rotational speed of the high-speed spool, the actual value of the selected engine pressures which provide an accurate measure of engine thrust, and a commanded value of the selected engine pressures are processed; and an error signal is provided in response to these three signals which is a function of all three signals. The error signal is then used to control the rate of fuel flow to the engine which, in turn, controls engine thrust. In one embodiment the error signal is a function of the rotational speed of the high-speed spool and the actual and commanded values of engine pressure ratio, and in another embodiment the error signal is a function of the rotational speed of the high-speed spool and the actual and commanded values of integrated engine pressure ratio.

REFERENCES:
patent: 3797233 (1974-03-01), Webb et al.
patent: 3854287 (1974-12-01), Rembold
patent: 4159625 (1979-07-01), Kerr

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