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By Prof. Dr. Dimiter Driankov, Dr. Hans Hellendoorn, Dr. Michael Reinfrank (auth.)

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The second pair of nature characteristics defines whether the process control system is used mainly to provide information display and/or advice giving for the process operator, or whether it automatically, without any operator intervention, determines and executes appropriate control actions. The KBS which can be employed during the particular phase of operation, for the specific task of control, can be classified, according to [179], into four main categories. The classification is done according to the intended use of the KBS in the control task and the scope and nature characteristics of the control task itself.

Minor fluctuations in the process output are not passed further to the control output. 4 Knowledge Representation in KECs 29 - - - - - - Yc y(k U u(k)I-----------set-point region u= smooth normal region , :ilu= Ke+ ... ,u max time Fig. 7. Type of control action desired in different regions around the set-point. (Redrawn from Sripada et al. 7 illustrates the type of control action desired when the process output is in different regions around the set-point, Although the above control objectives are typical of most industrial applications, a conventional PI(D )-controller cannot handle all three of them unless extended by some additional heuristic logic.

Thus, the current process output is approaching the set-point from below. The combination (negative e(k), positive Lle(k)) means that the current process output is above the set-point and decreasing. Thus the process output is approaching the set-point from above. The combination (negative e(k), negative Lle(k)) means that the current process output is above the set-point and increasing. Thus the process output is moving further away from the set-point and approaching overshoot. The combination (positive e(k), positive Lle(k)) means that the current process output is below the set-point and decreasing.

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