Patent ID: 8571696
Filing Date: 2013-10-29
Classification: G05B,Y02P

Abstract:
1. A method to predict process quality in a process control system, comprising: receiving process control information relating to a process at a first time including a first value associated with a first measured variable and a second value associated with a second measured variable; determining if a variation based on the received process control information exceeds a first threshold; if the variation exceeds the first threshold, calculating a first contribution value based on a contribution of the first measured variable to the variation and a second contribution value based on a contribution of the second measured variable to the variation; determining at least one corrective action based on at least one of the first contribution value, the second contribution value, the first value, or the second value; calculating a predicted process quality based on the at least one corrective action at a time after the first time; calculating a first unexplained variation and a first explained variation associated with the first contribution value; calculating a second unexplained variation and a second explained variation associated with the second contribution value; displaying the first unexplained variation and the first explained variation in a chart by at least one of superimposing the first unexplained variation on the first explained variation or showing together the first unexplained variation with the first explained variation; and displaying the second unexplained variation and the second explained variation in the chart by at least one of superimposing the second unexplained variation on the second explained variation or showing the second unexplained variation together with the second explained variation.