Method and control arrangement for controlling sheet-making process
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United States of America Patent
Stats
-
Jul 16, 2002
Grant Date -
N/A
app pub date -
Dec 1, 1999
filing date -
Dec 1, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a method and an arrangement for controlling a sheet-making process. In the solution, a sheet matching desired values is manufactured. A measuring unit measures the state of the process to produce one or more measurement value representing the state of the process. A comparator compares each measurement value with a corresponding desired value and, on the basis of the comparison, forms an error representing the difference between at least one measurement value and desired value. A control unit forms at least two control action candidates based on the error using at least two process models, of which at least one is a perturbed process model. A processing unit forms one control action from the control action candidates, with which control action the sheet-making process is controlled to produce a sheet matching the desired values.
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