In this work, the problem of identifying nonlinear systems is proposed. This latter is structured by Wiener systems. This latter (Wiener models) consist of linear dynamic subsystem followed by a nonlinearity function. The nonlinear systems identification is an active research area. Presently, the linear subsystem is allowed to be nonparametric and of structure entirely unknown. The proposed nonlinearity is of hard type. These nonlinear systems have been confirmed by several practical applications.