urgent help needed for knowing what is auto-tuning...

S

Thread Starter

sapan

hello friends....

i am in urgent need of knowing what is exactly auto-tuning pid controller and what r the steps of auto tuning.... i have to do a project on it...so please help me for getting the raw information.... please give me reply as soon as possible if u know anything about this...
 
B

Bill Clemons

Foxboro Exact, Honeywell LoopTuned II are commercial examples of auto-tuners for PID. Another reference is Expertune which employs several methods for approaching improved PID tuning parameters.
 
K

ke_engineering

Auto tuning is the self detection of the pid parameters. The controller will go though a procedure to set up the values automatically. It's a very simple way to optimize your controller.

Another producer of self tuning pid hardware controllers, especally for temperatures, is Omron. I've used then, very simple and relativly cheap. For the Siemens PLCs are software pid controllers available and as a add on there is a auto tuning software, too.
 
R

Richard A. Wolf

The term "auto-tuning" is a strategy where the user has the option to apply a strategy within the PID controller that automatically determines the most appropriate settings for the P, I, and D responses ( or combination variations ) based on process dynamics and application requirement.

Auto-Tuning or, self tuning is a software tool which can be used to eliminate the the time comsuming task of data gathering and calculation using transforms and Bodie plots.

The math models employed are based on optimum settings defined by Ziegler - Nichols ( and others ) and can establish calculated parameters for basic 1/4 wave decay strategies or can be highly agressive forms designed to achieve minimum overshoot.

Auto-tuning function can be either continuous or on demand and can be defined to calculate values during the start-up phase or at set-point. The form and selections are determined by the supplier.

Richard A. Wolf
Sr. Applications Specialist
Control and Recording Group
ABB Inc

[email protected]
 
A
Mere dost (my friend),

U know Tuning. In laymans terms for a PID controller, tuning means putting the P, I and D values in such a manner that the control loop is able to maintain the process variable within limits.

The P, I and D values can be put by experience, trial and error (getting to quarter amplitude damping etc.) or root locus etc.

There are also controllers which use algorithms/methods to find out the P, I and D values automatically.

These controllers are said to have auto tuning facility and the process is known as auto tuning.

In most cases, autotuning involves giving a step disturbance to the process and then based on process response calculating the P, I and D values with initial values of P, I and D being assumed/ given by user. It is a complex process but hope this brief explaination gets u started. Regards,
Anand
 
I am a PLC programmer.
It is simply the control of an analogue output, around a specific setpoint, to change to result of the input to a plc. Auto tuning then is derivative action delayed by a time spec as the result gets closer to the setpoint.

[email protected]
 
E

enrico guasco

Auto tuning is a task performed by the CPU of a PLC in the attempt to find the correct data to fill the proportional/derivative variables in a PID. normally it depends on how fast/slow is the process, it normally useful because it allows the programmer to reach a starting value from which to start PID tuning... Ex. on SoftPLC from SoftPLC Corp. there's a Auto-Tuning task triggered setting a value % different on the SP. After that, the PLC reads the process variable and changes PD values on the SoftPLC trying to stabilize the process.

Enrico Guasco

Tex-El di Guasco Enrico
Borgata Ricca, 6
13822 - Mosso (Bi)
ITALY

Tel. +39015702972
Fax. +390157011935
Cell. +393482644838
email. [email protected]
[email protected]
[email protected]
http://www.tex-el.com
 
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