Abstract
Abstract A new auto-tuner for PID controllers is described. It combines two commonly taken approaches : analysis of process transient responses and estimation of the process critical point through a relay feedback experiment. The system selects the most appropriate controller among a PI, a PID or a PI regulator coupled with a Smith predictor. The controller parameters are based on estimation of the normalised process dead-time and modified Ziegler-Nichols rules. The system is implemented on a Sun workstation and uses a real-time expert system developed with Muse. The paper describes the methods used and gives simulation results.
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