Fuel control system for a gas turbine engine

Details Fuel control system for a gas turbine engine Fuel control system for a gas turbine engine

1981-11-10

1984-03-20

Casaregola, Louis J.

Power plants

Combustion products used as motive fluid

Combined with regulation of power output feature

60243, F02C 928

Patent

active

044373031

ABSTRACT:
A fuel control system for a gas turbine engine comprises a main steady-state fuel control unit which adjusts the fuel flow to the engine to produce an approximation to a desired thrust and a trimmer device which trims the fuel flow demanded by the main unit to produce a closer approximation to the desired thrust. During transients such as accelerations a trimmer suitable for steady operation will apply zero trim until the desired thrust is almost attained, when an amount of trim may have to be applied rapidly. This can lead to overshoots.
To mitigate the problem the trimmer is provided with a model of the main control unit which derives an approximation to the trim which will be required when the steady state is reached. This is applied to the main unit throughout the transients, and when the desired thrust is achieved only second-order changes need to be made.

REFERENCES:
patent: 3648033 (1972-03-01), Bader
patent: 3854287 (1974-12-01), Rembold
patent: 3969890 (1976-07-01), Nelson

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