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Modeling device and modeling method for determining membership functions for fuzzy logic processing

Image Number 4 for United States Patent #5602966.

A fuzzy membership function modeling device in which membership functions, represented as geometric shapes or forms, and inference rules, represented in an If . . . Then format, are stored for access by a processor for making fuzzy inference of a control value for a controlled object. Also stored are parameters that are required to shift the membership functions or change their shapes and target inference values. In operation, corresponding membership functions and inference rules are fetched and an inference result generated. A comparison is made between the stored target value and the inference result value and a difference determined. If the difference is outside a predetermined or selected range, on the basis of stored parameters, the membership function is shifted or the shape thereof is changed by an incremental amount and the inference process is again executed.

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