Stimulate your thinking: look at PID in a different way

Maybe you should turn off the automatic tuning feature for a moment and consider what's really going on in that controller.

12/15/2010


Over the last 40 or 50 years, the automation technologies that run our process plants have changed dramatically. (Or at least they should have, but there are some plants that are still a little behind.) I’ve been around long enough to have witnessed at least some of it, but there are others that have been in the front lines and participated much more directly in the evolution.

I recently heard from Chuck Maher who certainly qualifies as a veteran. His experience includes marine engineering working on oil tankers, teaching servomechanism and feedback controls theory for GE, developing plastic soft drink bottles, and a whole lot of other things.

Chuck wrote an interesting article about understanding PID control from a viewpoint that we might not think about all that often these days. (Let’s face it, the ubiquity of computers running things tends to make us forget what’s really happening. When the black box does all the work, our individual thinking skills atrophy.) He uses Bode plots as his analysis tool, which may give you a new way to puzzle through the process and suggest new tuning approaches. (Here’s a piece we did on Frequency Domain Analysis a few years back. This may help too.)

Chuck posted the article at his Website. You have to go to the navigation bar and click where it says “control corner” to get to it. You might also want to browse around the site as well. There are all sorts of interesting things.

www.embededdesignservices.net



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Each year, a panel of Control Engineering and Plant Engineering editors and industry expert judges select the System Integrator of the Year Award winners in three categories.
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The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by Control Engineering subscribers.
System Integrator Giants
The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
System Integrator of the Year
Each year, a panel of Control Engineering and Plant Engineering editors and industry expert judges select the System Integrator of the Year Award winners in three categories.
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This eGuide explains how the operation of hydraulic systems for subsea applications requires the user to consider additional aspects because of the unique conditions that apply to the setting
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Edge Computing
This article collection contains several articles on how today's technologies heap benefits onto an edge-computing architecture such as faster computing, better networking, more memory, smarter analytics, cloud-based intelligence, and lower costs.
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Data centers, data closets, edge and cloud computing, co-location facilities, and similar topics are among the fastest-changing in the industry.
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Articles in this digital report highlight technologies that enable Industrial Internet of Things, IIoT-related products and strategies.
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Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

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August 2018
SCADA standardization, capital expenditures, data-driven drilling and execution
June 2018
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John O. Ayuk, PE, CFSE, PMP, CAP
Automation Engineer; Wood Group
Doug Baker
System Integrator; Cross Integrated Systems Group
Jose S. Vasquez, Jr.
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Fire & Life Safety Engineer; Technip USA Inc.
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This course focuses on climate analysis, appropriateness of cooling system selection, and combining cooling systems.
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