The parameter design of main components of hydrauLic excavator, mostly based on the specific structure of the system, has bad universaLity. In order to find a method that is versatile and has simple calculation process, it is figured out that different kinds of hybrid power system have the same path in the transfer of energy. The distribution of energy is decided by the upper Limit of direct power from the diesel engine. The upper Limit of direct power from the diesel engine, which could characterize the hybrid system, is used as the independent variable. The common expressions of the main components' installed parameter are deduced from the load curve. These expressions are used to design the parameters on a certain 7t hydrauLic excavator. The result shows that this method can be used to carry out parameter matching on different hybrid system and also shows significant reference value on choosing the overall plan of the hybrid system.
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