Control method of PI controller
First Claim
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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Abstract
A control method of a PI controller which selectively performs a proportional control and a proportional/integral control, the method includes Fourier transforming an output of the PI controller, calculating a spectral energy ratio of the transformed output of the PI controller of at a reference frequency for all frequency regions, 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 spectral energy ratio being the predetermined reference ratio or less. Accordingly, a PI controller utilizing the method can easily detect a switching point between a proportional control and a proportional/integral control, independent of species and states of a system thereof.
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Citations
26 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A control method of a PI controller which selectively performs a proportional control and a proportional/integral control, the method comprising:
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Fourier transforming an output of the PI controller; and
detecting a switching point between the proportional-control and the proportional/integral control by analyzing a spectral energy of the transformed output of the PI controller for a reference frequency. - View Dependent Claims (11, 12, 13, 14)
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15. A PI controller which selectively performs a proportional control and a proportional/integral control, comprising:
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a proportional controller;
an integral controller; and
a switching part which switches the integral controller on/off, wherein the PI controller performs one of the proportional control and the proportional/integral control according to a spectral energy of a Fourier transformed output of the PI controller for a reference frequency. - View Dependent Claims (16, 17, 18, 19)
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20. A driving system comprising:
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a driving part;
a PI controller which selectively performs a proportional control and a proportional/integral control of the driving part according to a spectral energy of a Fourier transformed output of the PI controller for a reference frequency. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A PI controller which selectively performs a proportional control and a proportional/integral control, comprising:
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a proportional controller;
an integral controller; and
a switching part which switches the integral controller on/off, wherein the PI controller determines a switching point between the proportional control and the proportional/integral control, independent of species and states of a system having the PI controller, according to a spectral energy of a Fourier transformed output of the PI controller for a reference frequency.
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Specification