2.4 液压自由活塞发动机（HFPE） HFPE（hydraulic free piston engine）是一种将一次动力机(内燃机)和二次动力机(液 压泵)结合为一体，利用液体(液压油)作为传输介质的复合发动机 [14-17] 。
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To study the starting performance of hydraulic free piston engine (HFPE), the typical starting phases of HFPE were investigated through experiments.
为研究液压自由活塞发动机(HFPE)的起动性能，对HFPE样机的典型起动方式进行了实验研究。
In a HFPE, the free piston assembly is driven back and forth between two outer dead centers by fuel energy, and at the same time hydraulic oil is pumped out for energy.
在左、右动力腔的交替驱动下，HFPE的活塞组件在腔体中作往复直线运动，同时泵出液压油驱动负载工作。
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