ST52T410 datasheet(38/84 Pages) STMICROELECTRONICS

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ST52T410/T420/E420

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Figure 6.3 Fuzzyfication

6.4 Defuzzyfication

this

phase

the

output crisp

values

are

determined by implementing the consequent part

of the rules.

Each consequent Singleton Xi is multiplied by its

weight values

calculated by the Decision

processor, in order to compute the upper part of

the Defuzzyfication formula.

Each output value is obtained from the consequent

crisp values (Xi) by carrying out the following

Defuzzyfication formula:

where:

i = identifies the current output variable

N = number of the active rules on the current

output

ij = weight of the j-th singleton

Xij = abscissa of the j-th singleton

The Decision Processor outputs are stored in the

RAM location i-th specified in the assembler

instruction OUT i.

6.5 Input Membership Function

The Decision Processor allows the management of

triangular Mbfs. In order to define an Mbf, three

different parameters must be stored on the

Program/Data Memory (see Figure 6.4):

the vertex of the Mbf: V;

the length of the left semi-base: LVD;

the length of the right semi-base: RVD;

In order to reduce the size of the memory area and

the computational effort the vertical range of the

vertex is fixed between 0 and 15 (4 bits)

By using the previous memorization method

different kinds of triangular Membership Functions

may bestored. Figure6.5 shows someexamples

of valid Mbfs that can be defined in ST52T410/

ST52x420.

Each Mbf is then defined storing 3 bytes in the first

Kbyte of the Program/Data Memory.

The Mbf is stored by using the following instruction:

MBF

n_mbf lvd v rvd

where:

n_mbf is a tag number that identifies the Mbf

lvd, v,and rvd are the parameters that describe the

Mbf’s shape as described above.

Figure 6.4 Mbfs Parameters

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 .......

ijωij

∑

---------------------

LVD

RVD

Input Mbf

Output Singleton

Output Variable

Input Variable

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