Non-linear level controller

Details Non-linear level controller Non-linear level controller

1979-08-28

1981-05-05

Schwadron, Martin P.

Fluid handling

Processes

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

137389, 137395, 196132, 202160, 203 1, 203DIG18, 364118, 364500, F17D 301

Patent

active

042652634

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.

REFERENCES:
patent: 2476104 (1949-07-01), Mason
patent: 2842311 (1958-07-01), Detrie
patent: 3224947 (1965-12-01), Lupfer
patent: 3411308 (1968-11-01), Bellinger
patent: 3449215 (1969-06-01), Johnson et al.
patent: 3594559 (1971-07-01), Pemberton
patent: 3602701 (1971-08-01), Boyd, Jr.
patent: 3676304 (1972-07-01), Hobbs
patent: 3967937 (1976-07-01), Hobbs
patent: 3974364 (1976-08-01), Sallberg et al.

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