Abstract
Granules conveyed by transportation equipment with screw blades, such as a screw conveyer, are discharged pulsatingly. Therefore, the accuracy of supply is usually represented by the quantity of granules discharged from the screw conveyer per unit hour. However, if the instantaneous flow rate can be detected and the control can be implemented on the basis of it, then we may be able to construct a better conveyer system. In this paper, the control of the outflow quantity from the screw conveyer is discussed. As a control algorithm, a generalized predictive control (GPC) method, which is useful to the nonminimum phase process and the process with variable dead-time, is applied to the screw conveyer process. As for the results, good response waves are obtained for a step reference input and a disturbance input by introducing a zero compensator and a filter polynomial into the control algorithm.
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