Hydraulic excavator is a kind of high-power and high-energy engineering machinery. Because of the various power losses in its hydraulic system, the efficiency of hydraulic system of excavator will be reduced to varying degrees. When excavator works, the maximum efficiency of hydraulic system can reach more than 95% without considering the drag along the way. But because of the complicated working conditions and large load changes of excavator, the efficiency of hydraulic system is also greatly changed. The energy saving technology of hydraulic excavator can not only effectively reduce the fuel consumption rate, but also reduce the power loss of hydraulic system, improve the utilization rate of engine power, make the power system better match with the power required by the load, thus reducing the working intensity of engine and hydraulic components, reducing the system heating and improving the reliability of equipment. Therefore, the excavator industry at home and abroad attach great importance to the research and development and application of excavator energy saving technology.
