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Safety Critical Control Elements Examples

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from Safety Critical Control Elements Examples by Chethan C U
The files contained have the examples for safety critical control elements.

FirstOrderFilterTest.m 
% Safety Critical Control Design.
% Control element Simulation and testing Examples.
% Based on requirements available at
% http://www.mathworks.in/matlabcentral/fileexchange/39047-testing-of-safet
% y-critical-control-systems
%
% Copyright Chethan CU - chethan.cu@gmail.com 
% Jan 2013

clear all 
DT = 0.02;
Tmax = 5;
t=0:DT:Tmax;
% Define Inputs here -----------------------------------------------

ns=[0 10 ];
ds=[1 10];
[Nz,Dz]=c2dm(ns,ds,DT,'tustin');

input = ones(length(t),1)*5+5;
input(1:10)=5;
init = zeros(length(t),1);
init(1:2)=1;

out = input(1);
pro=input(1);
pri=input(1);
output=[]; 
% Start of Algorithm -----------------------------------------------
for i = 1:length(t)
    
    if init(i) > 0
        
        out = input(i);
        pro=out;
        pri=input(i);
    else
        out=Nz(1)*input(i)+Nz(2)*pri-Dz(2)*pro;
        pro=out;
        pri=input(i);
    end
    output=[output;out];
end
% End of Algorithm -----------------------------------------------

% simulate the simulink model --------------------------------------
sim('FirstOrderFilter');
% plot results -----------------------------------------------------
subplot(211)
plot(t,input,t,output,t,o);
legend('Input','Code','Simulink')
title('Input Vs. Outputs')
subplot(212)
plot(t,output-o);
title('error=CodeOutput - SimulinkOutput ')
shg;

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