System for precisely controlling discharge rates of...

Details System for precisely controlling discharge rates of... System for precisely controlling discharge rates of...

G - Physics

01

G

222/96, 341/38.4

G01G 13/295 (2006.01) G01G 11/08 (2006.01) G01G 13/29 (2006.01) G05D 7/06 (2006.01)

Patent

CA 2028997

System for controlling the discharge rate of a material feeder. A weight scale connected to the material is sampled and the samples input to a digital processor. The digital processor determines for consecutive time intervals during discharge of said material, a [AV] weight loss over the time interval. The [AV] weight loss for the interval is compared with a desired weight loss which is calculated from a desired setpoint material discharge rate. The resulting error is averaged with subsequent errors to form a control signal for the material feeder. The calculation of errors over each subsequent interval increases the resolution of the control signal, increasing the ability to control discharge rates to compensate for changes in material density which other wise affect discharge rates.

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