(1) A simplified model as a combination of a nonlinear term and two FOPTD models. The nonlinear term describes the generic behaviour of To as illustrated in Fig. 5. The parameters' dependence on the operating point is modeled through switching between the two FOPDT models.
(2) A set of data is available so that groups can generate their own models (for initial design).
(3) Based on the derived nonlinear model a set of parameters(for the nonlinear model) will also be derived.This nonlinear model can be alternatively used for the design as well as initial tests.