ST52T301 datasheet(15/100 Pages) STMICROELECTRONICS

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2.4.3 Inference Unit

It managesthe alphaweights obtainedby the Alpha

Calculator Unit to compute the truth value (

ω ) for

each rule.

This is a calculation of the maximum (for the OR

operator) and/or minimum (for the AND operator)

performed on alpha values according to the logical

connectives of fuzzy rules.

It is possibile to link together up to eight conditions

by linguistic connectives AND/OR, NOT operator

and brackets.

Each rule can have at maximum 8 alpha weights

(however they are connected).

The truth value

ω and the related output singleton

are passed to the Defuzzifier to complete the

inference calculation.

Input 1

α1

Input 2

α2

OR = Max

IF INPUT 1 IS X1 OR INPUT 2 IS X2 THEN .......

Input 1

α1

Input 2

α2

IF INPUT 1 IS X1 AND INPUT 2 IS X2 THEN .......

Figure 2.10.

2.4.4 Defuzzifier

This block consists of a Multiplier, two Adders and

one Divider. It generates the output crisp values

implementing the consequent part of the rules.

In this phase each consequent Singleton Xi is

multiplied by its weight values

ωi, calculatedby the

Inference Unit in order to compute the upper part

of the defuzzification.

Each output value (FUZZY_OUT0, FUZZY_OUT1)

is deduced from the consequent crisp values (Xi)

by using the defuzzification formula:

∑Xij ωij

∑ωij

where:

i = 0,1 identifies the current output variable

N = number of the active rules on the current output

ωij =weigth of the j-th singleton

Xij = abscissa of the j-th singleton

The two fuzzy outputs are stored in the location 9

and 10 of the Input Registers (FUZZY_OUT_0,

FUZZY_OUT_1).

i-th OUTPUT

VARIABLE

j-th Singleton

Figure 2.11.

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