pid tunnig with non unity feedback

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metchat aissa
metchat aissa 2020-4-1
评论： metchat aissa 2020-4-2
Hello, I would like to know what the code would be to obtain the PID values for the sys below,
with G , H are two tranfers functions and C is the pid controller
i used the following code but it didn't work!!!
C=pidtune(feedback(G,H),'pid',1.0)
sys=feedback(C*G,H)
step(sys)
Thank you.
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Birdman
Birdman 2020-4-1
Try the following approach:
s=tf('s'); %needed to define transfer function in s domain
G=1/3*s+4;H=1/(0.1*s+1); %if feedback is not unity, then it has to be considered in open loop, as G*H
C=pidtune(G*H,'PID',1)
sys=(C*G)/(1+C*G*H)
step(sys)

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