Szukana fraza: [Abstract = "Predictive Functional Control \(PFC\), belonging to the family of predictive control techniques, has been demonstrated as a powerful algorithm for controlling process plants. The input\/output PFC formulation has been a particularly attractive paradigm for industrial processes, with a combination of simplicity and effectiveness. Though its use of a lag plus delay ARX\/ARMAX model is justified in many applications, there exists a range of process types which may present difficulties, leading to chattering and\/or instability."]