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Fuel supply control system for a turbine engine

  • US 4,380,894 A
  • Filed: 09/08/1980
  • Issued: 04/26/1983
  • Est. Priority Date: 09/10/1979
  • Status: Expired due to Term
First Claim
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1. A fuel supply control system for a gas turbine engine comprising:

  • a turbine output shaft;

    a compressor shaft;

    a fuel control valve varying the ratio of an energized period and a deenergized period depending on the engine operating condition;

    first means for generating a first signal indicative of said compressor shaft revolution speed;

    second means for determining a target turbine output shaft revolution speed based on said first signal value and generating a reference signal having a value indicative of said target turbine output shaft revolution speed, said second means increasing said target turbine output shaft revolution speed when said first signal value is below a predetermined value;

    third means for determining an actual turbine output shaft revolution speed and generating a second signal indicative of the determined actual turbine output shaft revolution speed; and

    fourth means for comparing said second signal value with said reference signal value in order to determine the difference between the actual turbine output shaft revolution speed and target speed and for determining a duty cycle of a pulse signal based on the determined difference to control the ratio of the energized period and the deenergized period of said fuel control valve to reduce the difference in order to drive the engine at a constant speed.

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