January 2006

Process Control/Instrumentation

Consider the generalized IMC-PID method for PID controller tuning of time-delay processes

This simple analytical method provides PID parameters to give a desired closed-loop response while available for any class of time-delay processes

Lee, M., Yeungnam University; Lee, Y., GS-Caltex Corp.; Park, S., KAIST

Because the PID controller finds widespread use in the process industries, a great deal of effort has been directed at finding the best choices for the controller gain, integral and derivative time constants for various process models. Among the various PID tuning methods, IMC-PID1,2 has gained widespread acceptance in the chemical process industries because of its simplicity, robustness and successful practical applications. In most time-delay process cases, the ideal controller that gives the desired closed-loop response is more complicated than a PID controller. In the IMC-PID tuning methods, this problem is solved by using clever approximations of the time-delay term in such a way that

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