Microcontroller fuzzy logic processing module using selectable m

Details Microcontroller fuzzy logic processing module using selectable m Microcontroller fuzzy logic processing module using selectable m

1994-09-22

1996-02-13

MacDonald, Allen R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Combined cathode ray tube and circuit element structure

395 61, 395900, G06G 700

Patent

active

054917751

ABSTRACT:
A standardized microcontroller-based fuzzy logic processing module for generating control signal values in response to variable input signal values in accordance with constraints imposed by propositions or "rules" stored in memory in a standardized format. Each rule consists of one or more input conditions and an output directive. Each input signal and the output signal values are characterizable by their degree of membership in a predetermined number of fuzzy sets, each fuzzy set being defined by a membership function. Each input condition is composed of a reference to a particular input variable, which has been preprocessed into integer (whole number) normalized form and a reference to a membership function. Each output directive includes a reference to a further membership function. Each membership function is implemented by one of a three possible forms of standard membership data structures: a triangular function represented by three data points, a table lookup function represented by a two end data points and the points between these two end points, and an standard shape function composed of a set of data points and a set of reference points used to form a similar shape function by interpolation. Fuzzy logic processing is accomplished by determining the extent to which the input conditions are satisfied by the current values of the input signals in order to develop a rule strength value, and then performing a "center-of-gravity" determination based on the output membership function values of each satisfied rule integrated over the range of possible output signal values.

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A Fuzzy Logic Programming Environment for Real-Time Control, Dec. 31, 1988 Stephen Chiu, Masaki Togai.

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