Nonlinear control of liquid level

Details Nonlinear control of liquid level Nonlinear control of liquid level

1980-12-30

1983-06-07

Walton, George L.

Fluid handling

Processes

With control of flow by a condition or characteristic of a...

137389, 137395, 196132, 202160, 203 1, 203DIG18, 364183, 364500, F17D 301

Patent

active

043866239

ABSTRACT:
In a process in which liquid flows to a vessel and is then withdrawn from the vessel, method and apparatus is provided for implementing nonlinear liquid level control by providing a variable set point to a conventional level controller. The variable set point is a nonlinear function of the actual liquid level in the vessel. The variable set point enables the vessel to absorb disturbances in the flow rate of the liquid flowing to the vessel while the actual liquid level in the vessel remains between a desired high and low limit thus providing a smooth flow of liquid from the vessel.

REFERENCES:
patent: 3224947 (1965-12-01), Lupfer
patent: 3374152 (1968-03-01), Rijnsdorp
patent: 3411308 (1968-11-01), Bellinger
patent: 3449215 (1969-06-01), Johnson et al.
patent: 3676304 (1972-07-01), Hobbs et al.
patent: 3974364 (1976-08-01), Sallberg et al.
patent: 4106916 (1978-08-01), Tuckett et al.
patent: 4111218 (1978-09-01), Hobbs
patent: 4230534 (1980-10-01), Stewart
patent: 4265263 (1981-05-01), Hobbs

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