Continual self-tuning from load disturbance responses

Qing Guo Wang, Chang Chieh Hang, Qiang Bi

Research output: Contribution to journalArticlepeer-review


In this paper, a new continual self-tuning control scheme based on an unknown process response under load disturbance is proposed. It can re-estimate the possibly changed process frequency response using the benign process transients under an unknown step or impulse, like load disturbance. According to the disturbance response pattern, the unknown step/impulse like load disturbance is assumed to be generated by passing a step or an impulse through unknown rational function dynamics. With process input and output frequency response computed by FFT, the best estimation of the process frequency response is obtained using the least squares method. Based on the re-estimated process frequency response, a PID controller is re-tuned to adapt to the possible changes in the process. The effectiveness of the method is demonstrated through simulation examples and real-time tests.

Original languageEnglish
Pages (from-to)471-477
Number of pages7
JournalChemical Engineering Research and Design
Issue numberA4
Publication statusPublished - 1998
Externally publishedYes


  • Adaptation
  • Frequency responses
  • Identification
  • Least squares method
  • Unknown laod disturbance

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering


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