how to write PID function in .m file

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sujan
sujan 2012-5-14
评论： Sam Chak 2023-5-11
i need a pid function in my m file. could anyone please write the function.
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PUJARI MURAGA
PUJARI MURAGA 2016-12-1
You are having state space model. Suppose I have differential equations then is it possible to do without converting them in state space/laplace ?

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Arkadiy Turevskiy
Arkadiy Turevskiy 2012-5-14
编辑：Arkadiy Turevskiy 2014-10-27
This demo might help.
Arkadiy
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sujan
sujan 2012-5-17
thank you,
but my model is a space state model, and it has many tf. and i dont know how to connect space state form and PID controller. so could you please tell me how to use PID in m file which is not in tranfer function. thank you Arkadiy
Arkadiy Turevskiy
Arkadiy Turevskiy 2012-5-17
well, how many inputs and outputs does you system have? If is a single-input-single output system, then everything shown in the demo is still applicable.If you more comfortable dealing with transfer functions, convert your state space system to a transfer function using tf:
ss_sys=ss(a,b,c,d);
tf_sys=tf(ss_sys);

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更多回答（2 个）

Krishnendu Mukherjee
a way is there : suppose ur tf is (1/a+s) which is to be fed to a pid controler. then the overall tf will be: (Kp+Ki/S+Kd.S).(i/S+a)/(1+(Kp+Ki/S+Kd.S).(i/S+a)). now if you want to give step input then : num=[............] den=[............] tf=num/den ster(tf) so you have to transfer the PID and the tf to a overall transfer function.
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sujan
sujan 2012-5-17
thank you,
but my model is a space state model and its has 9 state parameters. and i dont know how to use PID in my system. and it is a MIMO system. 4 inputs and 9 outputs. so could you please help me to write a PID function for space state form not in tf. thank you

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Daniel
Daniel 2014-10-24
Please where's the demo? I'm also trying to write a matlab function for pid using the user-defined function block
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Suyog
Suyog 2023-5-11
How to write pid function in m file
Sam Chak
Sam Chak 2023-5-11
Hi @sujan
  1. You can use the pid() function directly.
  2. You can describe that in transfer function.
  3. You can model it using the descriptor state-space.
  4. Finally, you can put the pid equation in the way that is similar to the ordinary differential equation (ODE).

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