Apparatus for and method of correcting membership functions

Details Apparatus for and method of correcting membership functions Apparatus for and method of correcting membership functions

1991-08-14

1993-09-14

MacDonald, Allen R.

Boots, shoes, and leggings

395 51, 395900, 364163, G06F 1500

Patent

active

052456986

ABSTRACT:
An apparatus for and a method of creating membership functions for use with fuzzy inference rules in a controller. A control error, which is a difference between a controlled variable obtained from a control object and a target value, is received as an input to the controller and then a fuzzy reasoning operation is executed in conformity with a predetermined fuzzy reasoning rule such that a manipulated variable resulting from the reasoning operation is supplied to the control object. Thereby achieving a fuzzy control on the control object. Basic membership functions are loaded in a memory. In response to input data which represents a desired characteristic for a predetermined range of a control error in a response characteristic of the control object, the apparatus adjusts the width, height, and/or position of the basic membership functions associated with the predetermined range to produce new membership functions which develop the desired characteristic.

REFERENCES:
patent: 4837725 (1989-06-01), Yamakawa
patent: 4924165 (1990-05-01), Kohno
patent: 5049796 (1991-09-01), Seraji

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