Open edgsc opened 5 years ago
interesting! the library is a straight-up port of another library so it's possible that there's a mistake there that I wasn't aware of.
The pid library uses parallel form that's listed on your table.
On Fri, Apr 12, 2019, 6:15 PM edgsc notifications@github.com wrote:
Hi Guys,
Isn't Ziegler-Nichols 2nd Method (Frequency Response Method or Oscillation Method or Ku/Pu Method etc) for Series PID Algorithm? [image: image] https://user-images.githubusercontent.com/32095476/56068791-82878180-5d56-11e9-9b34-c32f38e3e806.png
[image: image] https://user-images.githubusercontent.com/32095476/56068931-18bba780-5d57-11e9-99b5-5355df2bc5cf.png
From Autotuning of PID Controllers A Relay Feedback Approach_, 2nd edition, Cheng-Ching Yu (2007), page 30?
Thanks!
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interesting! the library is a straight-up port of another library so it's possible that there's a mistake there that I wasn't aware of. The pid library uses parallel form that's listed on your table. … On Fri, Apr 12, 2019, 6:15 PM edgsc @.**> wrote: Hi Guys, Isn't Ziegler-Nichols 2nd Method (Frequency Response Method or Oscillation Method or Ku/Pu Method etc) for Series PID Algorithm? [image: image] https://user-images.githubusercontent.com/32095476/56068791-82878180-5d56-11e9-9b34-c32f38e3e806.png [image: image] https://user-images.githubusercontent.com/32095476/56068931-18bba780-5d57-11e9-99b5-5355df2bc5cf.png From Autotuning of PID Controllers* A Relay Feedback Approach_, 2nd edition, Cheng-Ching Yu (2007), page 30? Thanks! — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#20>, or mute the thread https://github.com/notifications/unsubscribe-auth/AAWL8lzWYsATnwGL7TO4GgmMewiTQuOHks5vgQWJgaJpZM4ctif5 .
Thanks for your reply, Bret!
Just as an example, here's what it looks like after conversion from Series Kp-Ki-Kd to ISA Ideal (or ISA Standard Form):
Ku: 155,839
Pu: 269,617
Series:
Kp: 91,67
Ki: 0,68
Kd: 3085,77
ISA Ideal:
kp: 114,56
Ki: 0,68
Kd: 3085,77
Only Kp changed, about +24%; making the parameters a bit more aggressive.
hi @edgsc, I have work out a set of parameters using autoTune lib for dc motor. this is original PID and response curve.
this is Kp scale up to 1.24
its aggressive and take a little more time to convergence.
Hi Guys,
Isn't Ziegler-Nichols 2nd Method (Frequency Response Method or Oscillation Method or Ku/Pu Method etc) for Series PID Algorithm? From https://www.pidtuning.net/pid-algorithm.php
From Autotuning of PID Controllers A Relay Feedback Approach_, 2nd edition, Cheng-Ching Yu (2007), page 30?
Bret's PID library uses ISA (Ideal) PID Algorithm, right?
So, shouldn't we transform Kp, Ki, Kd from Series to Parallel form?
from http://www.acsysteme.com/en/serial-or-parallel-pid
Or from ISA slides:
from ISA Effective Use of PID Controllers 3-7-2013, https://pt.slideshare.net/sarodp/isa-effective-use-of-pid-controllers-372013 @br3ttb
Thanks!