PID self-tuning controller for aluminium rolling mill

An implementation of a self-tuning proportional-integral-derivative (PID) controller on a single-stand cold-rolling aluminium mill is described. The approach compensates for changes in the process and product without requiring a priori knowledge of these changes. The design is based on an adaptive control scheme in which the control coefficients are adjusted according to estimates of the plant parameters and a preselected desired performance for the control system. The weaknesses of the types of controllers currently used, the goals of the self-tuning control system, a summary of its design, and the parameter estimator algorithm are discussed. A summary of the implementation results is presented.<>