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Stall detector and surge prevention feature for a gas turbine engine

  • US 4,507,915 A
  • Filed: 01/25/1984
  • Issued: 04/02/1985
  • Est. Priority Date: 04/30/1981
  • Status: Expired due to Fees
First Claim
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1. A fuel control system for a gas turbine 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 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;

    means for controlling the fuel flow to the gas turbine engine as a function of said error signal;

    means responsive to the actual speed signal and the demanded speed signal for generating a stall factor as a function of the difference between actual speed signal and the demanded speed signal and indicative of the degree of stall the engine is experiencing; and

    means, responsive to the stall factor, to further control fuel flow to the gas turbine engine.

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