An Automatic Tuning Method for Multiloop PID Controllers

Abstract In this paper we propose a new automatic tuning technique for multiloop PID controllers applied to MIMO processes. The process parameters are estimated by employing simple closed-loop experiments (where roughly tuned PID controllers are in place), namely, by evaluating the response of the system to a sequence of set-point step signals (one for each reference input). Once the process transfer function is obtained, a (IMC-based) PID tuning rule already proposed in the literature is then applied to suitably re-design the PID controllers. Simulation examples are given to illustrate the methodology and to show its effectiveness.

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