According to the analysis of excavator power system and working system, in order to realize the power matching of excavator engine and hydraulic system, the work that must be completed includes:
1) By controlling the variable displacement pump, the power consumption of the actuator is controlled within the maximum power of the engine at a certain throttle position.
2) By controlling the variable displacement pump, the shock wave of the actuator caused by the change of working resistance is controlled within the range of engine response ability.
3) By controlling the variable displacement pump, the engine always works at a certain optimal working point when the hydraulic excavator works.
Based on the above analysis, if the energy loss is not considered, in order to ensure the continuity of excavation action, it is necessary to ensure that the absorbed power of the variable displacement pump in each operation cycle is less than or equal to the output power of the engine. The purpose of power control is to maximize the absorbed power of the variable displacement pump, that is, the absorbed power of the variable displacement pump tends to be equal to the output power of the engine at the best working point in each working cycle.
