State-estimation of sandwich systems with dead zone

A non-smooth observer is proposed in this paper to estimate the states of the sandwich systems with dead zone. In the scheme, a nonsmooth state-space function is constructed. Then, the corresponding nonsmooth observer is developed based on the obtained state-space model. In this observer, the operating zones are switched based on the characteristic of operation conditions. The convergence of the proposed observer is discussed. Finally, a simulation example is presented.