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Definition of "internal model control (IMC)" |
a feedback control structure in which the output from a model of the process is subtracted from the process output to form the feedback signal. Using this loop configuration as a theoretical construct, the design of closed loop controllers (which is a difficult nonlinear mathematical problem) becomes equivalent to the design of an open loop controller (which is a simpler linear problem). IMC is a special case of Q-parametrization or Youla parametrization of all stabilizing controller, and is closely related to the Smith Predictor invented in the late 1950s. Unstable processes need to be stabilized first by an inner loop before application of this theory. Practical designs for processes subjected to input disturbances should be checked for internal performance. |
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