Matlab function in Simulink

2020 10 3
0 个回答
更新时间：2020 10 6
5 次查看（30 天）

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Hello,
I have problem with MATLAB function in Simulink - after Run values are always zero, while other parts of code (built in PID controller) are working quite good.
function PWMout = myPID(valTarget,valPres, kp, ki, kd, Td, Ts,errorPrev,...
PIDoutMax, PIDoutMin, errorTolerance)
upperBound = PIDoutMax - (PIDoutMax*(1-errorTolerance));
lowerBound = PIDoutMin - (PIDoutMin*(1-errorTolerance));
errPres = valTarget - valPres;
Pout = kp*(errPres - errorPrev);
Iout = ki*errPres;
Dout = kd*(Td/Ts)*(errPres - (2*errorPrev) + ...
+ errorPrev);
PIDoutTemp = Pout + Iout + Dout;
PWMout = PIDoutTemp;
errorPrev = errPres;
end

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Ameer Hamza
Ameer Hamza 2020-10-3
Try adding a breakpoint inside the function to see whether what is causing the output to remain zero. https://www.mathworks.com/help/matlab/matlab_prog/set-breakpoints.html
ps19
ps19 2020-10-3
编辑：ps19 2020-10-3
Yes I know about debugging but code is in Subsystem/MATLAb function block and when I will add breakpoint it didn`t stop on it - it didn't matter which place in code of subsystem.
Ameer Hamza
Ameer Hamza 2020-10-3
Can you attach the model?
ps19
ps19 2020-10-3
编辑：ps19 2020-10-5
Yes no problem. In attachment
Ameer Hamza
Ameer Hamza 2020-10-4
I tried running the model. The brakpoint is working and it does give non zero value in PWMout.
ps19
ps19 2020-10-5
It`s started working, I created new model recreated block by block, something must have been crashed in some configuration stage.
Ameer Hamza
Ameer Hamza 2020-10-6
Btw, look at persistent variables. You will need that to properly save PID values from the last step inside the function block.

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ps19
ps19
2020-10-3

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Ameer Hamza
Ameer Hamza
2020-10-6

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