Using PID controller for nonlinear processgreenspun.com : LUSENET : PID Controller Tuning : One Thread
are there methods to use PID controller for the control of nonliear process?
-- chibani radhia (firstname.lastname@example.org), October 10, 2002
-- amr basha (email@example.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 (firstname.lastname@example.org), 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 (jpgNews@expertune.com), January 11, 2003.