Method of operating a multi-variable process

Abstract

A method of operating a multi-variable process comprises deriving a multi-dimensional representation of the process variables according to individual co-ordinate axes, defining a feasible region of the process variables by selecting from an accumulation of historical sets of values of all the variables, obtained from multiple operations of the process, to define an operational envelope containing a set of data points for which the product qualities are within predetermined limits, calculating the convex hull of this set of data points, determining an interior hypercube inside the convex hull, the interior hypercube having sides that are parallel to each axis, and then operating the process with the process variables as defined within the interior hypercube.

Dependencies are inferred from the claim text.