Fuel control system for gas turbine engine
First Claim
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1. A fuel control system for a gas tubine engine comprising:
- means for generating an actual speed signal proportional to the actual turbine speed of the gas turbine engine;
means for generating a scheduled speed signal proportional to a desired engine output power;
means for generating a demanded speed signal proportional to the time integral of a difference signal;
means for generating said difference signal proportional to the difference between said scheduled speed signal and said demanded speed signal;
means for generating an error signal proportional to the difference between said demanded speed signal and said actual speed signal; and
means for controlling the fuel flow to the gas turbine engine as a function of said error signal.
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Abstract
A fuel control system (11) for a gas turbine engine (10) is disclosed. The proportional control regulates the fuel flow Wf from a hydromechanical unit (36) based upon an error signal E representing the difference between a demanded speed signal Nd and an actual speed signal Ng. The demanded speed signal Nd is generated by an integrator (32) as the time integral of the difference between the demanded signal Nd and a scheduled speed signal Ngs. Additionally, the difference signal is limited between an upper limit Al and a lower limit Dl prior to the integration by a comparator (28) and limited circuit (30).
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Citations
15 Claims
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1. A fuel control system for a gas tubine engine comprising:
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means for generating an actual speed signal proportional to the actual turbine speed of the gas turbine engine; means for generating a scheduled speed signal proportional to a desired engine output power; means for generating a demanded speed signal proportional to the time integral of a difference signal; means for generating said difference signal proportional to the difference between said scheduled speed signal and said demanded speed signal; means for generating an error signal proportional to the difference between said demanded speed signal and said actual speed signal; and means for controlling the fuel flow to the gas turbine engine as a function of said error signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A fuel control system for a gas turbine engine of the free turbine type having a gas generator and a power turbine, characterized by:
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means for generating an actual speed signal proportional to the actual turbine speed of the gas generator of the engine; means for generating a scheduled speed signal proportional to the desired output power of the power turbine of the engine; means for generating a demanded speed signal proportional to the time integral of a difference signal; means for generating said difference signal proportional to the difference between said scheduled speed signal and said demanded speed signal; means for generating an error signal proportional to the difference between said demanded speed signal and said actual speed signal; and means for controlling the fuel flow to the gas generator of the free turbine engine as a function of said error signal. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A fuel control system for a gas turbine engine including an integrator for generating a demanded speed signal which is proportional to the time integral of an acceleration term;
- means for generating an error signal proportional to the difference between the demanded speed signal and an actual speed signal indicative of the actual speed of the engine; and
means for controlling the fuel flow to the engine as a function of said error signal;
said fuel control system characterized by;means for generating said acceleration term as the difference between said demanded speed signal and a scheduled speed signal indicative of a desired engine output power.
- means for generating an error signal proportional to the difference between the demanded speed signal and an actual speed signal indicative of the actual speed of the engine; and
Specification