In this paper, the design of H_∞ filter for nonlinear networked control systems with network-induced delay and data packet dropout are studied by using the Lyapunov sta-bility theory and the sum-of-square(SOS) approach. By using the boundedness of the time-varying delay, a new Lyapunov functional is constructed. Jesen inequality and a new bounded real lemma are derived for this systems and by introducing a free matrix, the new method to design the filter is proposed which has less conservative. Based on the previous research, considering the limitations of network communication bandwidth, a new discrete event-triggered communication scheme is proposed to save limited transmission resource. By using the unequal delay position method, a new Lyapunov functional is constructed. Using the Lyapunov functional method, sufficient conditions for asymptotically stable of the filtering error system are given in terms of SOS. At the same time, a new co-design method is developed for the triggering condition and the filter. Finally, the results can be solved via the recent developed Matlab toolbox SOSTOOLS efficiently and simulation examples are given to verify the merits and effectiveness of the proposed method. |