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Improved Kalman Filter in Process Control System

A Kalman filter, control system technology, applied in general control systems, control/regulation systems, program control, etc., can solve problems such as poor operation of control systems

Active Publication Date: 2018-06-05
FISHER-ROSEMOUNT SYST INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When producing estimates of process variable values, other traditional Kalman filters assume zero-mean process or measurement noise in the process
In processes where this assumption is incorrect, Kalman filter based control systems may operate poorly

Method used

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  • Improved Kalman Filter in Process Control System
  • Improved Kalman Filter in Process Control System
  • Improved Kalman Filter in Process Control System

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] figure 1 A process control system 10 is described that can be used to implement control routines using a predictor-based controller and based on intermittent, slow, or aperiodic process variable measurements while still providing a high degree of process control accuracy. Overall, figure 1 The process control system 10 includes a process controller 11 connected to a data historian 12 and to one or more host workstations or computers 13 (which may be any type of personal computer, workstation, etc.) having a display screen 14. Controller 11 is also connected to field devices 15 - 22 via input / output (I / O) cards 26 and 28 via hardwired communication connections. Data historian 12 may be any desired type of data collection unit having any desired type of memory for storing data and any desired or known software, hardware or firmware, and although shown as a separate device, may Instead or in addition be part of one of the workstations 13 or another computing device suc...

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PUM

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Abstract

A control technique that allows the use of received process variable values ​​in a Kalman filter-based control scheme without changing the control algorithm, the control technique comprising controllers such as PID controllers and Kalman filters, said The Kalman filter is coupled to receive feedback, for example in the form of a process variable measurement signal from the process. The Kalman filter is configured to generate an estimate of the process variable value from an intermittent or slow process feedback signal during each controller execution cycle, while providing the new process variable estimate to the controller so that the controller can generate Control signals used to control the process. The Kalman filter is also configured to compensate the process variable estimate for process noise with a non-zero mean that may occur in the process. A Kalman filter can apply this compensation to receive process variable values ​​continuously and intermittently.

Description

[0001] Cross References to Related Applications [0002] This application is related to US Patent Application No. 13 / 782,478, filed March 1, 2013, entitled "Use of Predictors in Process Control Systems with Wireless or Intermittent Process Measurements," which is expressly incorporated herein by reference. technical field [0003] This document relates generally to process monitoring and control systems and more particularly to the transmission and processing of continuous, wireless and / or intermittent control communications in process control systems with controllers using Kalman filters. Background technique [0004] Process control systems, such as those used in chemical, petroleum, or other processes, typically include distributed or scalable process control systems communicatively coupled to each other, via an analog, digital, or combined analog / digital bus. One or more process controllers are communicatively coupled to an operator workstation and one or more field dev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04
CPCG05B13/048G05B2219/41146G05B2219/41367G05B19/058
Inventor T·L·布莱文斯M·J·尼克松W·K·沃杰斯泽尼斯
Owner FISHER-ROSEMOUNT SYST INC