Patent ID: 8838278

Claim:
Method for controlling the production of a mixture M of n constituents, comprising: at time t=0 a step (i) of estimating a reference recipe ū on the basis of the properties of the n constituents assembled in a matrix {circumflex over (B)} having an initial value B 0 corresponding to the following equation (1) ⅆ B ^ j t ⅆ t = - β j ⁢ Hu ⁡ ( y j - y j mes ) ( 1 ) in which β j , a strictly positive real number, is a constant for setting a convergence time, allowing a rate of convergence of an estimate to be differentiated property by property; H is a positive definite symmetric matrix having the purpose of ensuring normalization in taking into account measurement-prediction deviation, allowing constituent quality prediction deviation calculation, so as to provide method convergence properties; and {circumflex over (B)} j t is the transpose of {circumflex over (B)} j , where j is a mixture property index, and such that properties {circumflex over (B)}ū mixture lie between predetermined minimum and maximum thresholds and/or for at least some of them are equal to predetermined target values, and the application of said equation to a real mixture of the constituents, at a time t′=t+Δt, Δt being the period of transition between two consecutive calculation iterations, a step (ii) of correcting the matrix {circumflex over (B)} on the basis of measured properties y mes of mixture M manufactured, in order to calculate a new recipe u corresponding to the corrected matrix {circumflex over (B)} of estimated properties of the constituents of the mixture, followed by the application of this new recipe u to the constituents for manufacturing the mixture M, this step (ii) comprising the following operations: (1) obtaining properties y mes of the mixture M by applying the recipe calculated at the previous time are measured, (2) a corrected matrix {circumflex over (B)}, representing the estimate of the properties of the constituents, is deduced therefrom, (3) a new recipe u is determined in such a way that properties {circumflex over (B)}u of the mixture lie between said predetermined thresholds and/or, for m′ of them, are equal to said predetermined target values, (4) this new recipe u is applied to the constituents, at time t″=t′+Δt a step (iii) identical to step (ii), this step (ii) being repeated identically throughout the duration of production of mixtures of the constituents, the method being characterized in that the matrix {circumflex over (B)} of step (ii) is corrected by at least one additional correction operation introducing at least one constraint corresponding to limit, order relationship and/or equality constraints.