G
Hello,
I'm working on controlling the flow of a pump. The pump in question has non-linear characteristic and I'm having trouble finding a transfer function so that I can tune the PID controller. Is such a non-linear system even possible to control with a PID-controller? I'm new at control system and some help would be greatly appreciated.
The attached graphs show how the pump reacts when I make it go from 0-x % of the max flow. The x-axis displays time and the y-axis displays the signal from a flowmeter with a 4-20mA signal. Also please note that we can´t read the Dead Time from the graphs since we didn't start the measuring exactly when we gave the pump a signal.
http://files.engineering.com/getfil...734-463d-92c7-7442e4d8cefa&file=Pump_char.png
I'm working on controlling the flow of a pump. The pump in question has non-linear characteristic and I'm having trouble finding a transfer function so that I can tune the PID controller. Is such a non-linear system even possible to control with a PID-controller? I'm new at control system and some help would be greatly appreciated.
The attached graphs show how the pump reacts when I make it go from 0-x % of the max flow. The x-axis displays time and the y-axis displays the signal from a flowmeter with a 4-20mA signal. Also please note that we can´t read the Dead Time from the graphs since we didn't start the measuring exactly when we gave the pump a signal.
http://files.engineering.com/getfil...734-463d-92c7-7442e4d8cefa&file=Pump_char.png