Identification and Controller Design for Nonlinear Processes Using Relay Feedback

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  • Lee Ming-Wei
    Center for Environmental, Safety and Health Technology Development, Industrial Technology Research Institute
  • Huang Hsiao-Ping
    Department of Chemical Engineering, National Taiwan University
  • Jeng Jyh-Cheng
    Department of Chemical Engineering, National Taiwan University

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As a sequel to the previous works of Huang and Lee (Huang et al., 1998, 2001; Lee and Huang, 2001), this work presents a new on-line method for identifying block-oriented models of Hammerstein-type or Wiener-type nonlinear processes from a relay feedback experiment. The identification of linear subsystem is focused. A simple transfer function of linear subsystem is determined by using an adjustable PI controller to develop a loop transfer function that has the dynamics of an integrator-plus-dead-time (IPDT) process. The static nonlinearity is represented by an invertible. Finally, the controller design using the identified model is illustrated.

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