Image Number 10 for United States Patent #5497449.
A fuzzy inference apparatus comprises a rule storing circuit for storing then-part positions respectively corresponding to first if-part membership functions and second if-part membership functions. The first and second if-part membership functions have shapes of triangles each having a base corresponding to positions of vertices of triangles of two adjacent membership functions. A rule selector sequentially compares an input value with positions of vertices representing the first if-part membership functions, retrieves two adjacent vertex positions between which a position of the input value is located, calculates first and second differences between the retrieved two vertex positions and the input value, sequentially compares an input value with positions of vertices representing the second if-part membership functions, retrieves two adjacent vertex positions between which a position of the input value is located, and calculates third and fourth differences between the retrieved two vertex positions and the input value. A membership value selector selects a minimum value of each rule on the basis of magnitudes of the first to fourth differences.
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