Abstract
We propose a new and simple on-line process identification method for the automatic tuning of the PID controller. It does not require a special type of test signal generators such as relay or P controller only if the signals are persistently exciting. That is, a user can choose arbitrary signal generators such as relay, a P controller, the controller itself, pulse signal and step signal generator because it needs only the measured process output and the controller output. It can incorporate nonlinearities due to actuator saturation or manual mode operation during identification work and shows a good robustness to measurement noises, nonlinearity of the process and disturbances. The proposed autotuner combined with the identification method and tuning rule using a model reduction shows good control properties compared with previous autotuning methods.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
Received
åstrom, K. J. and HÄgglund, T., “Automatic Tuning of Simple Regulators with Specifications on Phase and Amplitude Margins”,Automatica,20, 645 (1984).
Chen, C.F. and Shieh, L.S., “An Algebraic Method for Control System Design”Int. J. Cont.,11, 717 (1970).
Chen, C. F. and Shieh, L. S., “A Novel Approach to Linear Model Simplification”Int. J. Cont.,8, 561 (1968).
Chen, C. F., Huang, C. J. and Shieh, L. S., “Simple Methods for Identifying Linear Systems from Frequency or Time Response Data”,Int. J. Cont,13, 1027 (1971).
Chen, C.L., “A Simple Method for On-line Identification and Controller Tuning”,AIChE J.,35, 2037 (1989).
Coughanowr, D. R. and Koppel, L. B., “Process Systems Analysis and Control” McGraw-Hill, New York (1965).
Edgar, T.F., Heeb, R.C. and Hougen, J.O., “Computer-Aided Process Control System Design Using Interactive Graphics”Comp. & Chem. Eng.,5, 225 (1981).
Gibilaro, L. G. and Lees, F. P., “The Reduction of Complex Transfer Function Models to Simple Models Using the Method of Moments”,Chem. Eng. Sci.,24, 85 (1969).
Harris, S. L. and Mellichamp, D. A., “Controller-Tuning Using Optimization to Meet Multiple Closed-Loop Criteria”AIChE J.,31, 484(1985).
Jutan, A and Rodriguez, E. S., “Extensions of a New Method for On-Line Controller Tuning”Can. J. Chem. Eng.,62, 802 (1984).
Lee, J. and Sung, S. W., “Comparison of Two Identification Methods for PID Controller Tuning”AIChE J.,39, 695 (1993).
Lee, J., Cho, W. and Edgar, T.F., “An Improved Technique for PID Controller Tuning from Closed-Loop Tests”AIChE J.,36, 1891 (1990).
Lee, J., Lee, S. D., Kwon, Y. S. and Park, S., “Relay Feedback Method for Tuning of Nonlinear pH Control Systems”,AIChE J.,39, 1093 (1993).
Lee, J., “On-line PID Controller Tuning from a Single, Closed-Loop Test”AIChE J.,35, 329 (1989).
Levy, E. G, “Complex Curve Fitting”,IRE Trans. Auto. Cont.,AC-4, 37 (1959).
Li, W., Eskinat, E. and Luyben, W. L., “An Improved Autotune Identification Method”,Ind. Eng. Chem. Res.,30, 1530 (1991).
Loh, A P., Hang, C. C, Quek, C. K. and Vasnani, V. U., “Autotuning of Multiloop Proportional-Integral Controllers Using Relay Feedback”,Ind. Eng. Chem. Res.,32, 1102 (1993).
Matsubara, M., “On the Equivalent Dead Time”IEEE Trans. Auto. Cont.,AC-19, 464 (1965).
Papadourakis, A, Michael, F. D. and Douglas, M. D., “Approximate Dynamic Models for Chemical Process Systems”,Ind. Eng. Chem. Res.,28, 546 (1989).
Payne, P. A, “An Improved Technique for Transfer Function Synthesis from Frequency Response Data”,IEEE Trans. Auto. Cont,AC-15, 480 (1970).
Rugh, W.J., “Design of Nonlinear PID Controllers”,AIChE J.,33, 1738 (1987).
Sanathanan, C. K. and Koerner, J., “Transfer Function Synthesis as a Ratio of Two Complex Polynomials”,IEEE Trans. Auto. Cont,AC-8, 56 (1963).
Shen, S. and Yu, C, “Use of Relay-Feedback Test for Automatic Tuning of Multivariable Systems”AIChE J.,40, 627 (1994).
Sung, S. W. and Lee, L, “pH Control Using a Simple Set.Point Change”,Ind. Eng. Chem. Res.,34, 1730 (1995).
Sung, S. W., Lee, J., Yu, S. and Lee, I., “Automatic Tuning of PID Controller using Second Order Plus Time Delay Model”;J. Chem. Eng. Japan,29, 990 (1996).
Sung, S.W., Park, H.L, Lee, I. and Yang, D.R., “On-line Process Identification and Autotuning Using P-Controller”,First Asian Control Conference,1, 411 (1994).
Sung, S.W., Park J.H. and Lee, I., “Modified Relay Feedback Method”Ind. Eng. Chem. Res.,34, 4133 (1995).
Whitfield, A.H., “Transfer Function Synthesis Using Frequency Response Data”,Int. J. Cont,43, 1413 (1986).
Yuwana, M. and Seborg, D. E., “A New Method for On-line Controller Tuning”AIChE J.,28, 434 (1982).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Sung, S.W., Lee, IB. On-line process identification and PID controller autotuning. Korean J. Chem. Eng. 16, 45–55 (1999). https://doi.org/10.1007/BF02699004
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF02699004