Simulation experiments of a periodic control regime for continuous fermentation processes are described. They are carried out with a state-structure model on the basis of a system of delaydifferential equations. The perception of a fermentation system as an ecosystem leads to new and informative results which are to be applied to the development of efficient periodic control strategies.

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A concept for the periodic control of fermentation processes is presented which realizes a strategy with maximal material and energetic efficiencies. The program system for situation control, problems of selection of the feature vector and the experimental results are discussed.

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