| 초록 |
In this paper, an on-line process identification of second-order plus time delay(SOPTD) is proposed, which can be used to obtain a SOPTD model for a PID autotuning. This method uses an integral transformation and linear least squares method for estimating a SOPTD model parameter. Note that the proposed method can provide SOPTD model parameter without any initial state assumption, any model reduction step and iterative calculation. In spite of the simplicity of this method, it gives better modeling accuracy and the autotuned PID controller based on the obtained model shows much better control performances than those of previous methods.
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