Setpoint-oriented robust PID tuning from a simple min-max model matching specification

This communication addresses the setpoint robust PID tuning for stable first order processes with time delay (FOPTD) from a general min-max model matching formulation. In order to get a standard PID compensator, several choices are possible. This work considers the problem of finding the simplest one, based on conveniently adopting an approximate delay-free model for the FOPTD along with a particularly simple instance of the general model matching problem. The adopted methodology leads to a PID tuning just depending on a single parameter. Attending to common performance/ robustness indicators, this parameter is finally fixed in order to provide an automatic tuning just depending on the model information.