Robust output regulation for nonlinear systems containing nonpolynomial nonlinearity with nonlinear exosystems

In this paper, we consider the robust output regulation problem with nonlinear exosystems without the assumption that the solution of the regulator equations along the trajectory of the exosystems should be polynomial. Based on the extended concepts of steady-state generator and internal model, a set of sufficient conditions for the solvability of the problem are given. Thus, the result developed in this paper can allow the robust output regulation problem with nonlinear exosystems to accommodate much more general nonlinear given plants including those which contain nonpolynomial nonlinearity.