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Speed modification system for gas turbine engine to allow trimming of excess

  • US 6,487,490 B1
  • Filed: 02/18/2000
  • Issued: 11/26/2002
  • Est. Priority Date: 05/26/1999
  • Status: Expired due to Fees
First Claim
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1. A system for providing a modified fan speed signal for a gas turbine engine having a hydromechanical fuel control system comprising:

  • a) a memory device for storing fan speed modification level data as a plurality of fan speed modification characteristics;

    b) at least one speed monitor for measuring real time rotational fan speed of the gas turbine engine and providing an output signal representing real time speed;

    c) an identification plug containing electrical circuitry for activating a fan speed modification characteristic output from said memory device determined by testing of the specific engine being controlled to match actual engine thrust for said specific engine to the nominal thrust profile; and

    d) a signal processor for combining said fan speed modification characteristic output and said real time speed to generate a modified fan speed signal.

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