PID Ziegler-Nichols - Second Method

  • Thread starter Mauricio Mendes
  • Start date
M

Mauricio Mendes

Guest
People,

I am doing my undergraduate thesis about a electronic throttle
control, and i am trying to tunning this using a PID controller and
the second method.

The books always says we must keep increasing the gain until the
system output oscilllate. But if i keep increasing the gain without
change my reference in my system it just doesn't oscillate.

if i change the reference like square wave and than keep incresing the
gain, this will start to oscillate and than i can measure the periode
and the gain critical.

Do you know if that's all right? because the books does't say o have
to change the reference or you can change the reference.


Thank you,
Maurício Mendes
 
Mauricio Mendes wrote:
People,

I am doing my undergraduate thesis about a electronic throttle
control, and i am trying to tunning this using a PID controller and
the second method.

The books always says we must keep increasing the gain until the
system output oscilllate. But if i keep increasing the gain without
change my reference in my system it just doesn't oscillate.

if i change the reference like square wave and than keep incresing the
gain, this will start to oscillate and than i can measure the periode
and the gain critical.

Do you know if that's all right? because the books does't say o have
to change the reference or you can change the reference.


Thank you,
Maurício Mendes
This is a simulation rather than a prototype, right?

So if your simulation has exactly two poles, the overshoot will get
arbitrarily bad as you turn up the gain, but it'll never actually oscillate.

Hint: Try measuring a real system and making a more realistic model.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal
ElectroOptical Innovations
55 Orchard Rd
Briarcliff Manor NY 10510
845-480-2058

email: hobbs (atsign) electrooptical (period) net
http://electrooptical.net
 

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