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System and method for transfer of feedback control for a process control device

A process control, feedback control technology, applied in general control systems, control/regulation systems, program control, etc., to solve problems such as downtime, inoperability, process or plant accidents, etc.

Inactive Publication Date: 2007-07-04
FISHER CONTROLS INT LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, and as a result of the nature of feedback control, a faulty sensor can lead to an inoperable valve despite the otherwise healthy condition of the valve
Once rendered inoperable, the valve further may cause unplanned or unnecessary shutdown of the process or plant

Method used

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  • System and method for transfer of feedback control for a process control device
  • System and method for transfer of feedback control for a process control device
  • System and method for transfer of feedback control for a process control device

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Embodiment Construction

[0029] The disclosed controllers and methods generally relate to feedback control mechanisms for process control devices, such as valves. Although the disclosed controllers and methods are described in detail in connection with pneumatically actuated valves, the disclosed controllers and methods are suitable for use with or implemented with otherwise actuated valves, as well as process control devices other than valves. Accordingly, the disclosed controllers and methods can be used or implemented in conjunction with any device in a process control network, and are particularly suitable for applications having two or more possible feedback mechanisms available as controls device of. While it is also possible to use the disclosed controllers and methods in conjunction with two feedback controls of the same or similar types, the exemplary embodiments described herein present controllers in the context of switching feedback control between two different control mechanisms. and me...

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Abstract

Disclosed herein is a controller and method useful for transferring control of a process control device between first and second control modes. The controller includes first and second servo control modules that generate first and second drive signals based on feedback information from first and second sensors for control of the process control device in accordance with first and second control modes, respectively. The controller also includes a feedback control transfer module that transfers control of the operation of the process control device from the first control mode to the second control mode based on the feedback information from the first sensor. In certain embodiments, such control transfer involves a control routine that initially generates the second drive signal based on the first drive signal to effectuate a smooth, bumpless transfer between the control modes.

Description

[0001] related application [0002] This application claims priority to U.S. Provisional Application Serial No. 60 / 598,701, filed August 4, 2004, entitled "System and Method for Switching Feedback Control of Process Control Equipment," the entire disclosure of which is incorporated herein by reference. technical field [0003] The present invention relates generally to process control equipment and, more particularly, to a system and method for controlling process control equipment incorporating multiple feedback control mechanisms. Background technique [0004] A variety of control mechanisms may be used to control valve / actuator assemblies or other process control devices. For example, valve controllers typically use a form of feedback control to control the valve / actuator assembly. Feedback control relies on an error signal, which is further based on the difference between a desired setpoint signal and a feedback signal from a sensor, and which provides an indication of...

Claims

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Application Information

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IPC IPC(8): G05B19/10G05B11/00G05B7/00
CPCG05B7/02G05B5/01G05B9/00G05B2219/41311G05B2219/41304G05B7/00G05B5/00
Inventor 吉米·L·斯诺伯格斯蒂芬·G·斯尔伯格李多利·平格
Owner FISHER CONTROLS INT LLC
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