R. Sahu and S.K. Mathew
PID control, process control, performance improvement, performance index, controller tuning, framework
The pervasive use and performance problems of Proportional- Integral-Derivative (PID) controllers in the process industry sector prove that the implementation of a PID Control Performance Im- provement (PCPI) system is a value-adding activity. This article, based on the limitations of the existing control loop performance- monitoring tools, approaches PID control performance from an improvement perspective. An integrated framework for PCPI system development in the measure-diagnose-correct logical sequence is proposed. The various tools required for each phase, user interface requirements, and effectiveness of object-oriented system modelling are presented. Based on the proposed framework, a decision support system is developed for PID control. The application of the system to performance analysis and corrective action of a vulcanization process control proved substantial scope for performance improvement, thus validating the proposed framework.
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