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Variable geometry hysteresis control for a gas turbine engine

  • US 7,866,159 B2
  • Filed: 10/18/2005
  • Issued: 01/11/2011
  • Est. Priority Date: 10/18/2005
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • operating a gas turbine engine including a variable geometry mechanism with a number of vanes, a controller controlling the variable geometry mechanism according to a hysteresis band and operating to vary working fluid flow area between the vanes over a range from a first extreme to a second extreme, one of the first extreme and the second extreme defining a greater flow area than another of the first extreme and the second extreme;

    within the range, selecting a desired state of the variable geometry mechanism different than a current state of the variable geometry mechanism to provide a desired flow area closer to the first extreme than the current state; and

    transitioning the variable geometry mechanism from the current state to the desired state in response to said selecting by adjusting the variable geometry mechanism from the current state to an interim state with a corresponding flow area closer to the first extreme than the desired state, and subsequently adjusting the variable geometry mechanism from the interim state to the desired state to regulate hysteresis of the variable geometry mechanism.

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