Tag Archive: PID

Mar
24

Utilizing Wireless Throttling Valves in Control

PIDPlus Using Wireless Valve

Over the last five years a wide variety of WirelessHART transmitters have been introduced by the major manufacturers of field devices. The PIDPlus enables closed loop control using the slower update rate provided by a wireless transmitter. The broad acceptance of wireless transmitters has generated an interest in the application of wireless throttling valves in …

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Feb
24

Wireless Control – ACC 2014

The 2014 American Control Conference, ACC, will be held Wednesday through Friday, June 4 – 6, at the Hilton Portland & Executive Tower, Portland, OR. As noted on the conference web site, the ACC is internationally recognized as a premier scientific and engineering conference dedicated to the advancement of control theory and practice. Last year …

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Dec
09

Using Wireless Measurements In Control Applications

Using Wireless Measurements in Control

Wireless transmitters may be preferred in applications where new measurements are required since the cost may be lower than that associated with installing wired transmitters. However, there is a significant differences in the frequency and manner in which a new measurement value is updated by a wired transmitter vs. a wireless transmitter. Such differences must …

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Nov
04

Utilizing DeltaV Advanced Control Innovations

Utilizing DeltaV Innovations

Several Meet the Expects workshops are schedule on the last day of Emerson Exchange. As part of this effort, Willy Wojsznis and I co-hosted a workshop this year titled Utilizing DeltaV Advanced Control Innovations to Improve Control Performance. In this workshop we explore and discuss innovative features of the DeltaV PID and embedded Advanced Control …

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Oct
28

Process Education on Demand

Process Eduation on Demand

In Emerson’s boot camp for new engineers, I teach the portion on process control based on our book Control Loop Foundation – Batch and Continuous Processes. Each student receives a copy of this book. Customer may receive the same process control training by attending a 4 ½ day class, Control Loop Foundation – 9025, offered …

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Oct
07

Addressing Control in the Presence of Process and Measurement Noise

Application of Kalman Filter in DeltaV

When a measurement used in a control application is characterized by a significant amount of process or measurement noise then to avoid taking control action on noise filtering may be applied in the transmitter or in the control system. However, when traditional filtering techniques are used it is necessary to increase the PID reset time …

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Sep
16

Application of the Kalman Filter in Process Control

Kalman Filter Application in DeltaV

A paper published in 1960 by Rudolf Kálmán “A New Approach to Linear Filtering and Prediction Problems” is the basis for the Kalman Filter. The Kalman filter uses a dynamics model, measured control input(s) and process measurement(s) to estimate the process output. A wide variety of applications have successfully utilized Kalman filtering:  The guidance of …

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Sep
09

Control Using Wireless Measurements

Kalman Filter In Wireless Control

A number of technical challenges must be addressed when using a wireless measurement in closed loop control. In DeltaV v11 we introduced a PID option known as PIDPlus that may be selected when a wireless transmitter is used in a control application. When the PIDPlus option is selected then the same quality control as wired …

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Sep
02

Boot Camp for New Employees

bootcamp

In 2012 Emerson Process Management established a boot camp for new employees. In the boot camp I teach the classes on process control. The presentation I use in boot camp is based on material and process examples from our book Control Loop Foundation – Batch and Continuous Processes. The students in the boot camp use …

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Aug
19

Fuzzy Logic Control – Example

Process for Fuzzy Logic Workshop

In this fuzzy logic control workshop contained in Chapter 6 of Advanced Control Foundation – Tools, Techniques, and Applications, the control performance of fuzzy logic control is be compared to the performance of PID control. For this example, the control objective is to reach setpoint in minimum time with no overshoot. Two identical process heaters …

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