pi_dat.m

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

% pi_dat.m - PI-type Fuzzy Logic Controller with incremental output.
%
% Script file relationg to pi_dem_s.m and pi_dem_c.m in the fuzzy-toolbox.
% This file must invoked before the SIMULINK simulation can run.
% The controller and example is described in 'On methods for Improving 
% Performance of PI-type Fuzzy Logic Controllers', J.Lee, IEEE Trans. on
% Fuzzy Systems, Vol.1, No.4, Nov.1993. pp.298-301.
%
% FSTB - Fuzzy Systems Toolbox for MATLAB
% Copyright (c) 1993-1996 by Olaf Wolkenhauer
% Control Systems Centre at UMIST
% Manchester M60 1QD, UK
%
% 20-April-1994

% PI_Demo. PI-type Fuzzy Logic Controller:
% Definining the fuzzy-sets:
ERROR=modsuset('y',1,7,-0.25,0);
RATE=modsuset('y',1,7,-0.25,0);
OUTPUT=modsuset('n',1,7,-0.25,0);
clf

% Press any key after plot...

subplot(3,1,1),plot_set(ERROR),title('Error:');
subplot(3,1,2),plot_set(RATE),title('Error rate:');
subplot(3,1,3),plot_set(OUTPUT),title('Incremental control output');
% Converting the (continous) trapecoidal representation to a discrete form:
[E,ERROR]=con2dis(ERROR,200);
[R,RATE]=con2dis(RATE,200);
[O,OUTPUT,MOMENTS,AREAS]=con2dis(OUTPUT,200);

% Making the variables needed in the controller there avaible:
global E ERROR R RATE MOMENTS AREAS