Method and device for producing a mixture of constituents...

G - Physics – 05 – D

Patent

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G05D 11/13 (2006.01)

Patent

CA 2732886

The invention relates to a method and a device for controlling the production of a mixture of constituents, especially a mixture with premixing dead volumes. By correcting the matrices for calculating the mixing constituents used in the calculation of formulations, by introducing limits, order relationship and equality constraints, the drift observed in certain particular cases is avoided by implementing the method and improvements are made, on the one hand, to the diagnostic aid and the control of the estimate of the properties so as to limit the deviations from the actual quality of the constituents of the mixture and, on the other hand, to the speed of manufacture of the mixture and the robustness of the method. The method and the device according to the invention allow multi-variable feedback control by a dynamic observer allowing an estimate to be made in real time of the constituent properties of the mixture, said estimate being sufficient to guarantee the effectiveness of the feedback loop.

L'invention concerne un procédé et un dispositif de contrôle de l'élaboration d'un mélange de constituants, notamment d'un mélange avec volumes morts de pré-mélange. En corrigeant les matrices de calculs des constitutants de mélange utilisées dans le calcul de recettes, par l'introduction de contraintes de bornes, de relation d'ordre et d'égalité, on évite les dérives constatées dans certains cas particuliers par la mise en oeuvre du procédé, et on améliore d'une part l'aide au diagnostic et la maîtrise de l'estimation des propriétés afin de limiter les écarts par rapport à la qualité réelle des constituants du mélange et d'autre part la rapidité de fabrication du mélange et la robustesse du procédé. Le procédé et le dispositif selon l'invention assurent une rétroaction de régulation multi variable par un observateur dynamique permettant une estimation en temps réel des propriétés des constituants du mélange, suffisante pour garantir l'efficacité de la boucle de rétroaction.

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