Using PID controller for nonlinear process : LUSENET : PID Controller Tuning : One Thread

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

-- chibani radhia (, October 10, 2002


iam ok

-- amr basha (, 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 (, 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:

Or to get a newsletter article on it:

John Gerry

-- john Gerry (, January 11, 2003.

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