Boots – shoes – and leggings
Patent
1992-04-24
1994-08-02
Black, Thomas G.
Boots, shoes, and leggings
364479, 364153, 222 56, G01G 1108, G05D 900
Patent
active
053351851
ABSTRACT:
An automatic level control system and method provide continuous proportional control of an inlet valve when the level of material in a storage container is between low and high limits. The system includes a main feedback loop and a nested feedback loop to insure proper control of the inlet valve through which material is added to the storage container. The main feedback loop provides a control signal indicating the desired setting of the inlet valve, and the nested feedback loop provides a control signal indicating the actual position of the inlet valve so that the two control signals can be compared for use in accurately moving the inlet valve to the desired position. The main feedback loop includes a computer into which different density values can be input for accurately determining the amount of material in the container as indicated by a weight sensor.
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Fowler Charles E.
Pitts Alan J.
Black Thomas G.
Duzan James R.
Gilbert III E. Harrison
Halliburton Company
Zanelli Michael
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