| Hydraulic excavator is a kind of typical construction machineries, which is widely used, and works at complex conditions. With the oil price rising and stricter emissions standard, more excavator manufacturers have been going to put a lot of manpower and wealth into the saving reaserch about excavator.The paper analyzes the saving reaserch development about hydraulic excavator at home and board, learns that the power system of hydraulic excavator has low energy conversion efficiency, and observes that hybrid power system has successfully applied to the automobile field, which can save energy efficiently. And then the chief content of the paper is proposed, which is applying hybrid power system to hydraulic excavator, advancing control strategy over the hybrid power system based on working features, to achive the energy saving goal, and proving it through modeling and simulation.The paper introduces the structure and working principle of single bucket hydraulic excavator, and identifies parallel hybrid power system structure after comparing and analyzing nowadays developed hybrid power system structures: serial structure, parallel structure and parallel-serie structure. After identifying hybrid power structure, on the condition that load power demand is satisfied, the engine fuel consumption minimum setted as optimized object, with consideration of all influencing factors, each element's parameters are ensured, by analyzing the characteristics of various components such as diesel, generator/motor and so on.With Yuchai YC60-7 type as research prototypes, the paper builds parallel hybrid hydraulic excavator model utilizing the AMESim software, advances the parallel electric aid control strategy, and builds the strategy's MATLAB /Simulink model. AMESim model with MATLAB/Simulink model carries on co-simulation, and the simulation result shouws that parallel hybrid excavator can satisfy the system demand to power, engine has better fuel economy, and fuel consumption is reduced.
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