PID controller tuning for mixed continuous/discrete event processes using dynamic simulation

The paper discusses the use of dynamic simulation as a PID controller tuning tool for application with real plant or simulated worksheet data. The case study presented is but one example of a broad class of problems in control of processes with multi-loop interactions and combined discrete/continuous processes where these tools and methodologies may be helpful. The described example centers around the application of classical control theory to the problem of stabilizing mix tank level and concentration in a bottling line using a process model in the Simons IDEAS^TM dynamic simulator. Bottles are filled from a liquid mix tank whose concentration and level are controlled using PID controllers. The continuous controllers are subject to repeated disturbances caused by the pulsed discharge flow of liquid into the bottles. The paper illustrates the use of least-square identification, classical control theory, and computer simulation applied to this mixed continuous/discrete event process