Non-linear level controller
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United States of America Patent
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-
May 5, 1981
Grant Date -
N/A
app pub date -
Aug 28, 1979
filing date -
Aug 28, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A non-linear level controller is provided in which the proportional term is a function of the actual liquid level in a vessel compared to the actual liquid level in the vessel at a previous time. The integral term is a function of the actual liquid level in the vessel compared to a set point which is representative of the desired liquid level in the vessel. Both the proportional term and the integral term are modified by a variable gain factor which is a non-linear function of the liquid level being controlled. The proportional term and integral term are combined to provide the controller output which is utilized to manipulate a flow of liquid from the vessel in which the liquid level is being controlled.
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