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Reducing controller updates in control loop

A technology of process controllers and control signals, applied to controllers with specific characteristics, electric controllers, program control, etc., can solve problems affecting PID control and difficult robust control of controlled variables

Active Publication Date: 2019-07-05
FISHER-ROSEMOUNT SYST INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, in this case, the wireless communication of the target valve position (e.g. control signal) and the valve response introduces a considerable variable delay in the control loop, which affects the PID control, making robust control of the controlled variable more difficult

Method used

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  • Reducing controller updates in control loop
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Embodiment Construction

[0034] Control technology that enables a controller to transmit or send a control signal to a process controlled device, such as a valve actuator, in an aperiodic, wireless, slow, significantly delayed, or otherwise asynchronous manner, in order to reduce the The amount of actuator movement achieved while still providing robust control performance. Thus, control techniques implement control methods that drive actuators or other controlled equipment in a manner that reduces the power consumption of the controlled equipment, reducing frequent changes in the controlled equipment that often occur in control loops that are subject to significant noise or process disturbances The phenomenon of "flapping" in the control loop and reduce the communication load in the communication device in the wireless network used to implement the control loop, such as in the wireless gateway device.

[0035] Specifically, the control communication block in the control loop operates to send newly gen...

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Abstract

A control technique controls a process in a manner that reduces the number of controller changes provided to a controlled device, and so reduces the power consumption of the controlled device along with the loading of a process control communications network disposed between the controller and the controlled device. This technique is very useful in a control system having wirelessly connected field devices, such as sensors and valves which, in many cases, operate off of battery power. Moreover, the control technique is useful in implementing a control system in which control signals are subject to intermittent, non-synchronized or significantly delayed communications and / or in a control system that receives intermittent, non-synchronized or significantly delayed process variable measurements to be used as feedback signals in the performance of closed-loop control.

Description

[0001] This application is a divisional application. The filing date of the original application is March 20, 2015, the application number is 201580015134.3, and the title of the invention is "Reducing Controller Updates in Control Loops". [0002] related application [0003] This application is a duly filed application claiming priority to U.S. Provisional Patent Application Serial No. 61 / 968,159, filed March 20, 2014, entitled "Reducing Controller Updates in a Control Loop," the entire disclosure of which is hereby expressly incorporated by reference incorporated into this article. This application is also a continuation-in-part of U.S. Patent Application Serial No. 13 / 351,802, filed January 17, 2012, entitled "Compensating for Setpoint Changes in a Non-Periodically Updated Controller," the entire disclosure of which is hereby expressly incorporated by reference. into this article. This application is also related to U.S. Patent Application Serial No. 11 / 850,810, filed Sept...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B11/42
CPCG05B11/42H04L12/6418G05B2219/31121G05B2219/34413G05B2219/33192G05B2219/34306Y02P70/10G05B19/4185
Inventor T·L·布莱文斯M·J·尼克松K·K·詹森M·S·潘瑟D·陈E·罗特沃尔德
Owner FISHER-ROSEMOUNT SYST INC