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need some help with the simulink PID block

2 vues (au cours des 30 derniers jours)
Robert Scott
Robert Scott le 17 Déc 2023
Cant seem to tune this thing out.
First of all, let me say this, i am tuning a massive system that is not able to be realized by a trasnfer function. The model is a physical system. So using the tuning tools is out.
I cant seem to figure out what my controller is undershooting so badly.
For example, i have a full scale error possibility of about -5 to 5 with the setpoint being zero essentially or zero "error"
The controller does not even try and do anything until i am at nearly -2
Then -2 comes around and it sky rockets badly. Next thing you know im at 5
The integral gain is already very very small. the controller is running at about 200 hrtz which is reasonable for this type of system.
This is a generic thought question.
Why would a controller have asymetrical overshoot and undershoot. For example, if i have overshoot, i expect it to be the same percentage wise above and below the setpoint. My undershoot is significantly worse and i cant figure out why.
Any idea?
  2 commentaires
Neelanshu le 26 Déc 2023
Modifié(e) : Neelanshu le 27 Déc 2023
Hi Robert,
Kindly share the plot you obatined for the response of the system for a better understanding of the question and also indicate the expected behaviour of the system.
Arkadiy Turevskiy
Arkadiy Turevskiy le 10 Jan 2024
Hard to say anything based on information you provided. Your model could be nonlinear, not clear why in general you would expect to have symmetrical overhsoot and undershoot.

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