With this example, the controller of a tank filling/emptying system
is demonstrated.
The basic operation is to fill and empty the two tanks:
- Valve 1 is opened and tank 1 is filled.
- When tank 1 reaches its fill level limit,
valve 1 is closed.
- After a waiting time, valve 2 is
opened and the fluid flows from tank 1 into tank 2.
- When tank 1 reaches its minimum level, valve 2 is closed.
- After a waiting time, valve 3 is opened and
the fluid flows out of tank 2
- When tank 2 reaches its minimum level, valve 3 is closed
The above "normal" process can be influenced by three
buttons:
- Button start starts the above process.
When this button is pressed after a "stop" or
"shut" operation, the process operation continues.
- Button stop stops the above process by
closing all valves. Then, the controller waits for
further input (either "start" or "shut" operation).
- Button shut is used to shutdown the process,
by emptying at once both tanks by opening valve 2 and
valve 3. When this is achieved,
the process goes back to its start configuration
where all 3 valves are closed.
Clicking on "start", restarts the process.
The demo-run uses the following button presses:
- Button start pressed at 20 s.
- Button stop pressed at 220 s
- Button start pressed at 280 s
- Button stop pressed at 650 s
- Button shut pressed at 700 s
- Simulate for 900 s
This example is based on
- Dressler I. (2004):
- Code Generation From JGrafchart to Modelica.
Master thesis, supervisor: Karl-Erik Årzén,
Department of Automatic Control, Lund Institute of Technology,
Lund, Sweden, March 30, 2004
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