| 摘要 |
PURPOSE:To realize highly accurate weighing not affected by a variation in a flow speed, by performing fuzzy deduction on the basis of the flow rate characteristic of a flow rate controller controlling a flow speed and a weighing set value to determine the powder transfer speed of the flow controller before starting weighing. CONSTITUTION:When an arbitrary weighing set value is given to a weighing control apparatus 7, the fuzzy control part of the weighing control apparatus 7 calculates the initial rotational speed of a screw feeder 2 from the flow rate characteristic of the screw feeder 2 according to fuzzy deduction and opens a shutter gate 3. In the weighing control apparatus, 7 a filter operation part calculates the deviation between a fed back actually calculated value and the weighing set value and the timewise change quantity of the deviation. The fuzzy control part performs fuzzy deduction on the basis of this observation quantity and calculates the rotational speed of the screw feeder 2 in the next control cycle to alter a flow speed.
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