Electronics > Beginners
PID Regulator
(1/2) > >>
nForce:
Can a PID Regulator have two or more feedback loops? For example, if we are measuring process variable which has negative values and positive.
Yansi:
Not sure if I understand you correctly.

Regulator can regulate regardless the sign of the value.
MosherIV:

--- Quote ---Can a PID Regulator have two or more feedback loops? For example, if we are measuring process variable which has negative values and positive.
--- End quote ---
My understanding is no. PID only has a single control loop.
There are 2 ways to go about PID.
1. Manually tune the PI parameters to get best response then tweek the D.
2. Characterise the open loop transfer equation of the system, so that you can use for the closed loop equation.

With the 2 option, you can have as many inputs as you like. They will just boil down to a simple multiplier or an offset constants. This sounds like the 'negative values and positive'.
There is however only a single feedback loop.
IanB:

--- Quote from: nForce on September 09, 2019, 07:50:39 pm ---Can a PID Regulator have two or more feedback loops? For example, if we are measuring process variable which has negative values and positive.

--- End quote ---

One loop controls one variable. If you have two variables to control you will need two loops. It is possible for two loops to interact with each other, in which case more advanced strategies may be required.

Your question about negative and positive values is hard to understand. It is still a single process variable.
Dave:
Please be more specific with your question. It's very hard to give you any sort of meaningful answer (or alternative solution) to your problem if you're being vague.
Navigation
Message Index
Next page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod