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A Rule Based Design Methodology for the Control of Non Self-Regulating Processes

Non self-regulating (integrating) processes move in an unbounded manner when perturbed in open loop by a bounded manipulated or disturbance variable. It is not uncommon for some temperature, level, and pressure control loops to display this type of behavior. Integrating processes are surprisingly challenging to control and can move to extreme and even dangerous levels if left unregulated. An additional challenge is that the controllers and tuning methods proven for self regulating processes can yield poor and often unstable performance when applied to integrating processes. A rule based methodology for controller selection and design for non self-regulating processes is developed and documented. This work fills the gaps of previous research by providing a completely characterized set of controller design strategies encompassing a wide range of non self-regulating processes and control objectives. The rule structure developed guides the decision making pathways through the various design options.