To study the starting performance of hydraulic freepiston 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。
2
The objective of the study is to analyze one particular engine, the dual hydraulic freepiston engine-DHFPE.
双活塞式液压自由活塞发动机是将内燃机与液压泵集成为一体的新型动力机械。
3
In a HFPE, the freepiston 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.