Abrégé

Control of a multi-variable process throughout a plurality of successive, distinct operational phases of the process involves accumulation of sets of values of the process and quality variables (a-j) from previous multiple operations of the process through all its phases, as respective datasets of a historical record. Each dataset includes an identifier (p) of the phase to which it relates. The current values of the applicable process variables (Qa-Qh) during each phase and the phase identifier (p) are indicated on respective axes (Xp, Xa-Xh) of a multi-dimensional display in relation to an operational envelope which defines bounds (UL, LL) for the values of the individual process and quality variables {a-j) relevant to that phase and which is derived from the datasets of the historical record identified with that phase. Changes in the current process variables (Qa-Qh) result in changes of the bounds (UL, LL), and alarm is given when a current value departs from within them. Correction of an alarm condition is made manually or automatically in accordance with calculation of required change of value of one or more manipulatable process variables (a-c).

Classes IPC  ?

• G05B 19/418 - Commande totale d'usine, c.à d. commande centralisée de plusieurs machines, p.ex. commande numérique directe ou distribuée (DNC), systèmes d'ateliers flexibles (FMS), systèmes de fabrication intégrés (IMS), productique (CIM)
• G05B 23/02 - Test ou contrôle électrique

Abrégé

Control of a multi-variable process involves multiꂌ dimensional representation of the values (Qa-Qh) of the process variables a-h) according to individual coordinate axes (Xa-Xh) , and response based on sets of historical values for the process-variables accumulated from multiple, earlier operations of the process. An envelope (UL-LL) showing the best operating zone ( ΛBOZ' ) for each process variable due to the current values of the other variables is calculated from the accumulated historical values, and alarm conditions in which the current value of a variable lies outside the BOZ is rectified by operator- or automated-change of the values (Qa-Qc) of manipulatable variables a-c) . Targets for the variables are achieved, alarms rectified and value optimisation realised using an inner envelope (UI-LI) derived from a subset of the BOZ- defining set of historical values. Where the alarm rate is low, improved operation is obtained by narrowing down the BOZ set so as to tighten the BOZ envelope (UL-LL) to establish an inner envelope where alarm rate remains acceptable, as a new BOZ.

Classes IPC  ?

• G05B 15/02 - Systèmes commandés par un calculateur électriques
• G05B 23/02 - Test ou contrôle électrique