On Line Auto Tuning of PID Controller Using Successive Approximation Method

This paper presents the development of an on-line version of a new auto-tuning algorithm for proportional-integral - derivative (PID) controllers based on the successive approximation method. The new auto tuner causes only minor perturbation on the normal operation of the process, needs little a prior information, and is robust to noise. The performance and design for automatic selection of the PID constants are also discussed. The accuracy and performance of this new auto-tuning method have been substantiated by extensive lab works.