Importance

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Abstract

A method of controlling a process including at least two process variables and at least two control efforts, with each control effort having an influence on at least one process variable, including the steps of modelling the influence that a change in each control effort has on each process variable; describing the desired trajectory which each process variable will follow towards its desired value in response to a system change; and, coupling the control of each process variable; whereby changing a first set of at least one control efforts so as to cause a desired change in at least one process variable can be compensated for by a change in a second set of at least one control efforts so that substantially no influence in exhibited on other process variables in the system in which no change is desired. The method may include delaying a desired change in such first set of control efforts a time equal to the maximum dead time lapse of any control effort of such second set of control efforts relative to any such process variable for which no change in desired.

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First Claim