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Development of
a Dual Piston Hydraulic Free Piston Engine Prototype and
its Compression Ratio
XIA Bizhong1 WANG Jinsong1
FU Xin2 YANG Huayong2
(1. Department of Precision
Instruments and Mechanology, Tsinghua University, Beijing 100084;
2. State
Key Laboratory of Fluid Transmission and Control, Zhejiang University,
Hangzhou 310027)
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Abstract: A
dual-piston hydraulic free piston engine (DHFPE) is a compact unit
integrated by IC engines and a hydraulic pump. As a special IC engine,
which realizes non-stiffness power transmission utilizing hydraulic
pressure energy, it differs dramatically from conventional IC engines.
To deeply explore its working mechanism, a special structure DHFPE
prototype is presented and developed. Based on the studied DHFPE
prototype, three possible typical mount types are especially discussed
and the corresponding compression ratio change range is induced.
Additionally，the relationship between its compression ratio and design
parameters, mount type, working variables is concluded. Besides above,
for a certain DHFPE prototype, the dependence between its compression
ratio and the compression energy is achieved and the approaches to
control the real compression ratio are presented. The results are
helpful for DHFPE prototype development from the structure design and
compression ratio control as well as selecting of mounts type.
Key words: Dual
piston hydraulic free piston engine Structure design Compression ratio
CLC No: TH137 TK134
国家自然科学基金(50075077)和国家863计划(2001AA423150)资助项目. Received 20050128, received
in revised form 20050818
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