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Abstract

A fuzzy inference-based digital control method and apparatus wherein state variables of the controlled object are adopted as inputs thereof, and fuzzy inference computations are executed for the input variables taken as fuzzy variables to derive the control output value to be supplied to the controlled object by referring to predetermined implication rules and membership functions corresponding thereto. The inference rule is divided into an inference rule group for deriving a value representing the state of the controlled object from the measured value obtained from the controlled object and another succeeding inference rule group for deriving the control output value from the derived state value. These inference rule groups are successively used to execute the inference computation in a multistep manner. An optimum control value for the controlled object is obtained with easy tuning.

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