O'Reilly logo

Process Control: Modeling, Design, and Simulation by B. Wayne Bequette

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

9.1. Background

As we show in this chapter, the IMC structure can be rearranged to the standard feedback structure.

Question: Why do we care about IMC, if we can show that it can be rearranged into the standard feedback (PID) structure?

Answer: Because the process model is explicitly used in the control-system design procedure. The standard feedback structure uses the process model in an implicit fashion; that is, PID tuning parameters are often “tweaked” based on a transfer function model, but it is not always clear how the process model affects the tuning decision. In the IMC formulation, the controller, q(s), is based directly on the “good” part of the process transfer function. The IMC formulation generally results in only one tuning parameter, ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required