Method and device for the consideration of varying volume and flow in the control of a continuous flow process
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United States of America Patent
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Jun 27, 1995
Grant Date -
N/A
app pub date -
Aug 25, 1992
filing date -
Dec 28, 1989
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The control method is directed to a quality characteristic of the process material, typically to its outlet concentration. In control of the actuator which is a part of feedforward or feedback control of outlet concentration, one takes account of changes of the material volume and flow, in addition to the inlet concentration or control deviation. With this object, at least two of the quantities of inlet flow, outlet flow and material volume are measured or determined and by means of them a variable is further determined with regard to which the control method is invariant. Two alternative variables are presented, one being typically applicable to control of a process with finite distribution of the flow velocity and the other to control of a process with vigorous mixing. By means of a time-variable control method, the controls can also be implemented with time as the independent variable. The invention also relates to devices which implement the control methods presented.
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