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Guest
#1 Posted : Monday, July 19, 2010 5:58:29 AM(UTC)
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can anyone tell me what is PID tuning
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JoyM
#2 Posted : Saturday, August 14, 2010 7:00:48 AM(UTC)
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PID control uses feedback algorithm which typically looks as shown below:

OP = OP + P * [dE + E/I * dT + D * (d(dPV) / dT) ]

OP is the new OP calculated every scan time dT
OP goes to manipulate control valve

P = proportional gain
I = integral time
D = derivative constant

PID tuning refers to getting the best values for these P, I and D parameters.
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VinitaK
#3 Posted : Monday, August 16, 2010 7:01:31 PM(UTC)
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Excellent and lucid reply, Joy!
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melissa
#4 Posted : Wednesday, August 18, 2010 12:28:30 PM(UTC)
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Does anyone use the interactive forms of the PID controller? The form where Proportional and Integral are added and the sum multiplied by Derivative.
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melissa
#5 Posted : Wednesday, August 18, 2010 12:31:14 PM(UTC)
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Does anyone use the interactive forms of the PID controller? The form where Proportional and Integral are added and the sum multiplied by Derivative.
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Oscar Goodman
#6 Posted : Sunday, August 22, 2010 7:14:20 AM(UTC)
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Interactive forms of PID where the proportional and integral contributions are first added before multiplying by the derivative contribution are rare these days. The ideal form (non-interactive) is the most popular where all three contributions are added. The old interactive form was common during the days of analog control systems (before digital controls, DCS and PLC) because the PID controller was a box with pneumatic signals, bellows, tubes etc and it was easier to implement adding the P and I terms first before multiplying by the D term.
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Martin Schneider
#7 Posted : Saturday, August 28, 2010 8:23:32 AM(UTC)
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I work for Ford Motor company. We are looking for PID tuning simulation and optimization software. Our process dynamics are fast with delays and time constants under a few seconds or even less. Appreciate suggestions.
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VinitaK
#8 Posted : Wednesday, September 01, 2010 4:38:01 PM(UTC)
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Martin, to be honest, for such fast process dynamics, you can try intergal of 0.1 minute to 0.5 minute and prop gain in the 1-5 range and you should get good results. We have often used Pitops PID and Pitops TFI for all tuning needs, you can try Pitops also, but the benefits of tuning tools are the highest when dealing with slow loops with complex dynamics. Hope this helps.
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