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Control method of PI controller

  • US 7,085,611 B2
  • Filed: 08/06/2003
  • Issued: 08/01/2006
  • Est. Priority Date: 10/23/2002
  • Status: Expired due to Term
First Claim
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1. A control method of a PI controller which selectively performs a proportional control and a proportional/integral control, the method comprising:

  • Fourier transforming an output of the PI controller;

    calculating a spectral energy ratio of the transformed output of the PI controller at a reference frequency for all frequency regions; and

    performing the proportional control in response to the calculated spectral energy ratio exceeding a predetermined reference ratio, and the proportional/integral control in response to the calculated spectral energy ratio being equal to the predetermined reference ratio or less.

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