pi_fuz.m

FISMAT accommodates different arithmetic operators, fuzzification and defuzzification algorithm, imp

function o = pi_fuz(e,x,T)

% o = pi_fuz(e,x,T)
% 
% Fuzzy PI controller using continuous piecewise linear sets.
%
% FSTB - Fuzzy Systems Toolbox for MATLAB
% Copyright (c) 1993-1996 by Olaf Wolkenhauer
% Control Systems Centre at UMIST
% Manchester M60 1QD, UK
%
% 29-May-1994
 
global eset rset oset

% Fuzzification :
enT=fuzzsiyi(eset,e(1));       % e(1) corresponds to the error 
rnT=fuzzsiyi(rset,e(2));       % e(2) corresponds to the rate of error

% horizontal direction corresponds to enT.
% vertical direction corresponds to rnT.
NB=1; NM=2; NL=3; NS=4; NZ=5; PS=6; PL=7; PM=8; PB=9;

rt=[NB NM NL NS NZ ;
    NM NL NS NZ PS ;
    NL NS NZ PS PL ;
    NS NZ PS PL PM ;
    NZ PS PL PM PB];

% Using of Zadeh AND-Minimum operator and the Lukasiewicz OR=bounded sum:
rb=rtinf(rt,enT,rnT,'t3mi','s1bs'); 

% Defuzzification:

o=oset*rb;