What PID control strategy should be used to control the pressure at the inlet and outlet of a tank, thereby regulating the flow rate inside the tank?
Thread Content
The top of the tank is the inlet, with a pressure of P1； Below is the outlet, with a pressure of P2. I want to control P1 and P2 in order to change the pressure difference inside the tank. What PID control method should I use? My idea is to use ratio control, with P1:P2=1.5. I’m not sure how effective this approach will be
This method is not very good; with ratio control, the inlet pressure and outlet pressure can be kept at a certain ratio, but if the inlet pressure changes significantly, it’s impossible to determine how high the liquid level will remain
Isn’t your method just for controlling the liquid level? For flow control, just use direct flow control – are there any constraints?
That’s right; the container is filled with a substance whose resistance essentially counteracts the gravity of the water. Given that the resistance might be too high, and it’s difficult to determine the flow rate in water if flow is controlled, I thought of trying using pressure control instead.
So what do you think is a good way to control the pressure from above and below? Controlling pressure is a mandatory requirement.
Please, experts, help me figure this out:lol
If pressure is a mandatory requirement, then ratio differential control should be chosen; ratio control provides large-scale adjustments, while differential control offers smaller-scale adjustments