are there methods to use PID controller for the control of nonliear process?

-- chibani radhia (chi_radhia@yahoo.fr), October 10, 2002

Answers

iam ok

-- amr basha (elcalyouby@hotmail.com), November 29, 2002.

As a response for your question, I suggest the use of the new approches such as fuzzy logic and neural networks to adjust the parameters of the PID controller in order to control the nonlinear processus.

-- chibani radhia (chi_radhia@yahoo.fr), December 01, 2002.

YES! The simplest, and most straightforward was is to use a characterizer to linearize the loop. Most DCS systems have characterizer built in. You just need to set them.

The characterizer re-maps the controller output so the net effect is that the controller sees a linear process. In a sense, the characterizer cancels the non-linearity of the process. It does this by using a shape that is opposite that of the process characteristic.

For a presentation on linearization see: http://www.expertune.com/r.asp?f=ng&d=0103&l=1

Or to get a newsletter article on it: http://www.expertune.com/r.asp?f=ng&d=0103&l=2

John Gerry

-- john Gerry (jpgNews@expertune.com), January 11, 2003.