The energy-saving effect of traditional telescopic arm excavator can only depend on the improvement of power system and the effective recovery of energy wasted during the operation of telescopic arm excavator. Hybrid telescopic arm excavator can achieve the purpose of energy-saving. Hitachi built the world's first hybrid loader in 2003, a landmark move for construction vehicles.

　　1. 油电混合动力系统与油液混合动力系统的比较

　　1. Comparison of Hybrid Power System and Hybrid Power System

　　1.1油电混合动力

　　1.1 Oil-Electric Hybrid Power

　　在混合动力系统操作过程中,如果发动机或液压泵能量不超过实际的输出能量,然后在操作引擎将驱动液压泵,和多余的能量转换后的ISG电机电容充电,当液压泵运行时需要太多能量,发动机不能满足能源的需求,电容将会同引擎来提供能量的操作液压泵。伸缩臂挖掘机回转系统由原来的回转电机改造为ISG电机驱动，使回转系统制动时，ISG能将制动能量转化为电容充电能量。伸缩臂挖掘机动力臂产生的势能通过液压马达和马达系统回收，转换后的能量储存在电容器中。大修改后的混合动力系统的结构特点是,当系统所需的实际负载功率大,ISG电机可以帮助引擎,减少发动机的功率输出压力,因此发动机的燃料消耗将永远在一个合理的位置。当系统负载功率要求较低时，通过ISG回收多余的能量，并对电容器进行充电，使电机运行也能达到运行效果。

　　In the operation of hybrid power system, if the energy of engine or hydraulic pump does not exceed the actual output energy, and then the ISG motor capacitor is charged by the operating engine after converting the driving hydraulic pump and surplus energy. When the hydraulic pump is running, it needs too much energy, and the engine can not meet the energy demand, the capacitance will be increased with the engine. Operating hydraulic pump for energy supply. The rotary system of telescopic boom excavator is changed from the original rotary motor to ISG motor. When the rotary system is braked, ISG can convert braking energy into capacitor charging energy. The potential energy generated by the power arm of the telescopic arm excavator is recovered through the hydraulic motor and motor system, and the converted energy is stored in the capacitor. The structural feature of the modified hybrid power system is that when the actual load power required by the system is large, ISG motor can help the engine to reduce the power output pressure of the engine, so the fuel consumption of the engine will always be in a reasonable position. When the load power requirement of the system is low, the excess energy is recovered by ISG and the capacitor is charged, so that the motor can also achieve the best operation effect [2].

　　1.2油液混合动力

　　1.2 Oil Hybrid Power

　　伸缩式臂式挖掘机回转系统制动时，液压马达会溢出并发热，造成能量损失。因此，使用蓄能器回收和储存溢流能量是合理的。所以在电力系统的实际运行需要更大,可以通过回收蓄能器补充,同时也在下降的过程中从高动力臂将产生一定的势能,导致石油井架液压缸回油口的上升,这个时候可以把石油复苏的压力,通过蓄电池时,系统需要大量的石油回收油液压系统。

　　When the rotary system of telescopic arm excavator is braked, the hydraulic motor will overflow and heat, resulting in energy loss. Therefore, it is reasonable to use accumulator to recover and store overflow energy. Therefore, the actual operation of the power system needs more, which can be supplemented by the recovery accumulator. At the same time, in the process of descending, the high power arm will generate certain potential energy, which will lead to the rise of the oil return port of the hydraulic cylinder of the oil derrick. At this time, the pressure of oil recovery can be put. When the system passes through the battery, it needs a lot of oil recovery oil. Hydraulic system.