A FREQUENCY RESPONSE APPROACH TO AUTO-TUNING OF MULTIVARIABLE PID CONTROLLERS

摘要

In this paper, an autotuning method for fully cross-coupled multivariable PID controllers from sequential relay feedback is proposed. The frequency response of an mxm multivariable process is identified from limit cycles using a hi-1-based method, and a multivariable PID controller is computed with linear least squares frequency response fitting. Various typical examples are included for illustration of the effectiveness of the method.