fuzzy_pi.m

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

function o = fuzzy_pi(e,x,T)

% o = fuzzy_pi(e,x,T)
% 
% Fuzzy PI controller used by fuzdemo2
%
% FSTB - Fuzzy Systems Toolbox for MATLAB
% Copyright (c) 1993-1996 by Olaf Wolkenhauer
% Control Systems Centre at UMIST
% Manchester M60 1QD, UK
%
% 21-April-1994
 
global eset oset

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

% horizontal direction corresponds to enT.
% vertical direction corresponds to rnT.
NB=1; NS=2; NZ=3; PS=4; PB=5;

rt=[NB NS NZ ;
    NS NZ PS ;
    NZ PS PB];

% Using of Zadeh AND-Minimum operator and the Lukasiewicz OR=bounded sum:
rb=rtinf(rt,enT,rnT,'t3mi','s3ma'); 

% Defuzzification:

o=oset*rb;