Abstract:In view of the problems that the high altitude operating vehicle is difficult to be controlled in the process of lifting the different weight of cargo and lifting goods, and caused by variable loading force of pitch mechanism of the electro hydraulic servo, an integrated traditional proportion integration differential (PID) and H∞ infinity control of the composite control scheme was presented. The state space model of electro hydraulic servo pitch mechanism was derived, and on the basis of it, the H∞ infinity state feedback controller was designed, including the definition of performance evaluation indicators, construction of generalized system, using linear matrix inequalities to solve the state feedback matrix. SimulationX environment was applied to build a set of machine, liquid and control integrated simulation model for simulation research. The results show that to lift the load of different weight, aerial vehicles can operate stably.