Control system using process model

Details Control system using process model Control system using process model

2001-08-30

2004-08-03

Picard, Leo (Department: 2125)

Data processing: generic control systems or specific application

Specific application, apparatus or process

Product assembly or manufacturing

C700S128000, C162S049000, C162S238000, C162S252000, C162S262000

Reexamination Certificate

active

06772036

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to industrial process control. More specifically, the present invention relates to controlling processes which are used to manufacture paper or paper pulp.
In a control system, including controls systems which are used to control paper and paper pulp manufacturing, the state of a process is monitored by measuring “process variables.” A process variable refers to a variable which is related to the condition of the process such as a flow rate, a level, a temperature, a pressure, etc. Based upon the measured process variable, a controller operates a control element in order to bring the process variable within a target range. For example, in order to achieve a desired flow rate (process variable) a controller adjusts a valve (control element) accordingly.
One type of process control observes the quality of the product output to adjust the various process variables within the process. The quality measurement is a process variable which is measured at the output of the process. It can be difficult to control paper and pulp manufacturing processes using this technique because there is both a physical distance between the process output and a significant lag time due to the time it takes for a product to move through the process. The physical separation and the separation in time can make controlling the process to achieve a desired quality difficult.
SUMMARY OF THE INVENTION
A control system is provided for controlling a process for making paper or paper pulp. The process has a process product output at an end of the process. The controls include a process variable sensor input configured to receive a process variable related to the process. The controller is configured to provide a control signal to control the process. A process model has a model product output which is a model representation of the process product output. The model process output is a function of the sensed process variable and a product output setpoint representative of a desired process product output. The control signal is a function of the product output setpoint and the modeled product output.


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