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This paper introduces a PID controller with self-tuning function. It may provide optimal PID control parameters. The self-tuning algorithm based on the expert system and pattern recognition has quick convergence speed through the application of the new characteristic variables and the distinctive pre-tuning formulae. The uniformed self-tuning formula is also presented, which makes it easy to implement and maintain the expert system based on the single chip micro-processor.

most of the medium and small scale power plants in china are operating with the poor economic performance and reliability because of the poor automation system. it is a good method to use the intelligent digital controller to reform the automatic control and instrument system of these power plants. this article summaries the application of a kind of intelligent controller in the control of the steam temperature of a boiler. the controlled process is analysed first and then a control strategy is designed to obtain good control performance, the control program is given also. about one year stable operation of this control system proves that the design of this system is successful.