According to statistics, only about 20% of the engine output becomes the effective work of the excavator. In addition to the effective work, about 40% of the hydraulic components are lost, about 20% of the movement of the body and work unit is lost, and about 20% of the throttle speed control is lost.
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Through simulation, Carter obtained the energy loss distribution of each excavator component during the loading process. The energy loss of pump and control valve is about 2/3, and the energy loss of control valve is larger because many functions of control valve are integrated in it. The internal complexity of the oil circuit makes it difficult to reduce the pressure loss. Three-dimensional modeling analysis was required, and the passages were enlarged as much as possible to ensure strength and efforts were made to reduce narrow sections. In addition, the primary overload characteristics of the safety valve need to be improved and leakage should be reduced as the pressure of the safety valve approaches.
Energy saving measures for the general hydraulic system
- This variable pump uses pressure-sensing constant power control to effectively utilize engine power and change throttling speed to volumetric speed to reduce energy loss.
- Reduce the intermediate unloading loss and speed loss in the micro-operation process. Open center oil circuit using negative flow control or positive flow control, closed center using load-sensitive pressure compensation control, so that the middle time oil pump work in low pressure and small flow rate, only supply oil system. Cool and lubricate and flush a small amount of oil. Keeps the system in standby and responds quickly during operation. When operating micro-operation speed control, the oil pump can automatically change the displacement and oil supply according to the required flow rate.
- When the high pressure overload cuts off the overload overflow, the oil pump can automatically reduce the flow rate to a small value. In actual operation, the overflow operation is rare and the energy saving effect is not significant.