Help with liquid level control system

Hi All,

I have been tasked with designing a PI liquid level control system (gravity fed with a valve on the inlet and outlet) and have experienced some problems in regard to the literature I am using, (Process Dynamics and Control, 3rd Edition).

I have been tasked with finding the values of the tuning parameters Kc and ti using the direct synthesis method. When doing so, should I be setting theta (time delay) to 0?

Also, I am confused about the nature of T (tau). I know what Tc, Ti, and Td refer to, but I am so baffled by the T (tau) on the numerator of the below equation as it has no subscript. Also, if Ti = T then why would my teacher ask for Ti to be calculated as well as Kc?

Screen Shot 2019-12-27 at 16.57.36.png

Apologies, this is my first post on a forum. I have spent many days running in circles with this issue. If anyone can help I would be so grateful.
 
Hi All,

I have been tasked with designing a PI liquid level control system (gravity fed with a valve on the inlet and outlet) and have experienced some problems in regard to the literature I am using, (Process Dynamics and Control, 3rd Edition).

I have been tasked with finding the values of the tuning parameters Kc and ti using the direct synthesis method. When doing so, should I be setting theta (time delay) to 0?

Also, I am confused about the nature of T (tau). I know what Tc, Ti, and Td refer to, but I am so baffled by the T (tau) on the numerator of the below equation as it has no subscript. Also, if Ti = T then why would my teacher ask for Ti to be calculated as well as Kc?

View attachment 54

Apologies, this is my first post on a forum. I have spent many days running in circles with this issue. If anyone can help I would be so grateful.
Hi Yunus 27


I woul suggest you to have a look on this tutorial video for PI controller tuning for Tank level control:

Hope this can be an help

James
 
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