Patent ID: 6772036
Filing Date: 2004-08-03
Classification: D21G,D21H,G05B

Abstract:
A control system for controlling a process for making paper or paper pulp having a process product output at an end of the process, comprising:a process variable sensor input configured to receive a plurality of process variables related to the process for making paper or pulp paper sensed by a process variable sensor which provides a process variable output, the plurality of process variables measured at a plurality of locations along this process; a control element output configured to provide a control signal to a control element which controls the process in response to the control signal; a process model having a model product quality output comprising an inferred measurement of product quality output, the model product quality output comprising a model representation of the process product output in response to the sensed process variables, the process model based upon current process setpoints and current process control algorithms which are directly included in the process model; a product output quality setpoint representative of a desired process product output quality; a controller configured to compare the product output setpoint to the modeled product output and responsively provide the control signal to the control element; and wherein the process variable sensor input couples to a two-wire process control loop.