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Isochronous gas turbine speed control

  • US 4,672,806 A
  • Filed: 04/11/1985
  • Issued: 06/16/1987
  • Est. Priority Date: 01/28/1983
  • Status: Expired due to Term
First Claim
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1. Method of driving a controlled variable, which is indicative of the rate of fuel presently being delivered to a gas turbine engine, to a desired value in response to an input signal, comprising the steps of:

  • (a) processing the input signal to produce a processed signal having a value within a predetermined range;

    (b) generating a preliminary output signal having a time derivative substantially equal to the value of the processed signal;

    (c) subtracting from the input signal a signal derived from the preliminary output signal;

    (d) subtracting from the preliminary output signal a signal derived from the controlled variable;

    (e) modifying the predetermined range of (a) in accordance with the subtracted preliminary output signal of (d);

    (f) generating an output signal having a time derivative which is a function of the preliminary output signal after the subtraction of (d); and

    ,(g) modifying the controlled variable in accordance with the output signal.

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