How can i use the PID controller function

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William
William 2013 年 6 月 17 日
回答済み: bassem adel 2016 年 2 月 9 日
I am trying to use the PID controller in matlab but when i do, i get the message "undefined function or variable". Is there some download that i can install or if someone could give me a solution I'd appreciate it, got some assignments i need to complete.
Thanks in advance
  2 件のコメント
William
William 2013 年 6 月 17 日
I was trying to following an example i found on this website:
Kp = 1; Ki = 1; Kd = 1;
s = tf('s');
C = Kp + Ki/s + Kd*s
C =
s^2 + s + 1
-----------
s
C = pid(Kp,Ki,Kd)
tf(C)
ans =
s^2 + s + 1
-----------
thats when i get the message undefines function or variable "pid"

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採用された回答

Arkadiy Turevskiy
Arkadiy Turevskiy 2013 年 6 月 27 日
pid objects and PID Tool were added to Control System Toolbox in release 2010b. Upgrade to that release or later to be able to use pid objects.
You can still do what the example describes, you will just have to represent PID controllers as transfer functions, as discussed at the top of the example.

その他の回答 (2 件)

David Sanchez
David Sanchez 2013 年 6 月 17 日
As an example, you could take a look at the following link:

bassem adel
bassem adel 2016 年 2 月 9 日
how can I use the pid function in MATLAB R2007b ?

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