Design and Implementation of a Self-Tuning PID Controller

Abstract PID control schemes based on the classical control theory, have been widely applied to real control systems, and there have been a lot of works on the tuning of PID parameters, as they affect control performance. Several self-tuning and auto-tuning PID techniques have been reported for systems with unknown or slowly time-varing parameters. None, however, is applicable to discrete-time system with unknown dead time. In this paper, a self-tuning PID control algorithm is proposed based on the relationship between the PID control law and the generalized minimum variance control law which is one of self-tuning control strategies. The proposed control scheme is practically evaluated on a temperature control system of a poly butene reactor.

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