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

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8.7. The IMC Structure

The IMC structure is shown in Figure 8-12. The distinguishing characteristic of this structure is the process model, which is in parallel with the actual process (plant). Note that (~) is generally used to represent signals associated with the model. Other literature sources may use a subscript (such as m) to represent the model. Figure 8-13 illustrates that both the controller and model exist as computer computations; it is convenient to treat them separately for design and analysis.

Figure 8-12. The internal model control structure.

Figure 8-13. The IMC strategy. The dotted line indicates the calculations performed by the ...

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