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Leandro Diaz

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PID tuning example: Controller with a nonlinear response on the valve

Posted by Leandro Diaz on Jun 8, 2020 4:00:29 PM

When we work with PID controllers, we always assume that the control valve flow characteristic is linear. PID controllers cannot handle nonlinear responses properly. However, most of the time valves are nonlinear and we have to deal with them when tuning a loop. Process units that change their operating window regularly, have the tendency to affect the performance of the PID controllers. This probably has happened to you before and i know it's really frustrating! But I'll show you a PID tuning example where it's possible to tune a PID controller and have a good performance on a large operating window of a process unit. And that is what I will explain in this blog.

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Topics: PID tuning, PID tuning parameters, PID tuning methods