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| Research on Predictive PI Control Algorithm and Its Implementation in S7-300 PLC System |
| SHEN Ningbo1**, XU Zhaolian2, CAO Yubo1*
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| 1.School of Information and Control Engineering, Jilin University of Chemical Technology, Jilin City 132022, China；2. Department of Technology, Liaoning CIMC Hashenleng Gas Liquefaction Equipment Co., Ltd., Kaiyuan 112300, China |
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Abstract Aiming at the problem of large time delay in temperature control of industrial process, the control principle and mathematical model of predictive PI control algorithm are studied. Laplace inverse transform and differential separation method are adopted to obtain the mathematical model of predictive PI controller incremental discrete control algorithm in the time domain. The PLC program of predictive PI control algorithm is designed and written, and the controller algorithm program packaged with FB function block is tested. Simulation experiments show that the control quality of temperature control system with large time delay can be effectively improved, and it has good reliability and robustness.
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Published: 11 July 2026
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