The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 01, 2006
Filed:
Jun. 12, 2003
Ulf Persson, Örsundbro, SE;
Tomas Lindberg, Västerås, SE;
Lars Ledung, Västerås, SE;
Per-olof Sahlin, Göteborg, SE;
Lennart Kållén, Forshaga, SE;
Ulf Persson, Örsundbro, SE;
Tomas Lindberg, Västerås, SE;
Lars Ledung, Västerås, SE;
Per-Olof Sahlin, Göteborg, SE;
Lennart Kållén, Forshaga, SE;
ABB AB, Västerås, SE;
Abstract
A process is modeled by a dynamic model, handling time dependent relations between manipulated variables of different process sections (A–D) and measured process output variables. Suggested input trajectories for manipulated variables for a subsequent time period are obtained by optimizing an objective function over a prediction time period, under constraints imposed by the dynamic process model and/or preferably a production plan for the same period. The objective function comprises relations involving predictions of controlled process output variables as a function of time using the process model, based on the present measurements, preferably by a state estimation procedure. By the use of a prediction horizon, also planned future operational changes can be prepared for, reducing any induced fluctuations. In pulp and paper processes, process output variables associated with chemical additives can be used, adapting the optimization to handle chemical additives aspects.