Apparatus and method for controlling flow rate in vibratory feed

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Details

177105, 222 58, 364164, 364567, G06F 1520

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active

053413075

ABSTRACT:
A method and apparatus for controlling the actuator in a vibratory weigh feeding system, to adjust the discharge rate. The vibratory weigh feeding system has a material containers an actuator for vibrating the container, weighing apparatus for sensing the weight of the material being discharged and apparatus for estimating the material discharge rate. A plurality of drive command values are established. A respective predicted discharge rate and a respective reliability factor are associated with each respective drive command value. The current discharge rate is estimated. A setpoint value is selected. A drive command value associated with the predicted discharge rate that is substantially equal to the setpoint discharge rate is selected. The selected drive command value is reduced according to the two respective reliability factors associated with the two predicted discharge rates closest to the setpoint. This forms a reduced drive command value. A drive command signal representing the reduced drive command value is transmitted to the actuator, setting the discharge rate. The respective reliability factor associated with the selected drive command value is increased, if the respective predicted discharge rate differs from the estimated discharge rate by less than a predetermined amount.

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patent: 5260880 (1993-11-01), Tump

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