Welcome to Journal of Automotive Safety and Energy,
汽车安全与节能学报

Journal Of Automotive Safety And Energy ›› 2013, Vol. 4 ›› Issue (1): 1-15.DOI: 10.3969/j.issn.1674-8484.2013.01.001

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Energy-saving technologies of the unconventional thermal cycle internal combustion engines

PEI Pucheng, LU Yong   

  1. State Key Laboratory of Automotive Safety and Energy, Tsinghua University
  • Received:2013-01-07 Online:2013-03-25 Published:2013-03-27
  • About author:Prof. PEI Pucheng:Professor from the Department of AutomotiveEngineering of Tsinghua University. He is a vice director of the Combustion Energy-Saving and Purification Branch Committee of Chinese Internal Combustion Engine Society, member of the Fuel Cell Standardization Technical Committee, editorial board member of “Journal of Environmental Protection”,“Energy and Power Engineering”, “Mechanical Engineering and Technology”, etc. His research field covers application basis and technology research on automotive fuel cells and internal combustion engines

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Abstract:

Many unconventional thermal cycle internal combustion (IC) engines have been proposed which
greatly enhance IC engine thermal efficiency. By reviewing some typical energy-saving technologies of the
unconventional thermal cycle IC engines, two common characteristics are summarized in this paper, charger
transit between cylinders and steam assistance. By using the technology of the charger transit between
cylinders, a working cycle of an IC engine can be divided into several cylinders, so the compression ratio can
be greatly increased, or the over-expansion cycle can be realized, both of which can substantially enhance the
IC engine thermal efficiency. By using the technology of steam assistance, water can be heated and evaporated
into steam by injection into hot gas or heat exchanger. The exhaust energy can be recovered when the water
absorbs the exhaust heat and evaporates to perform further work, which can reduce the exhaust temperature,
thereby the IC engine thermal efficiency can be enhanced. The technologies of unconventional thermal cycle IC
engines provide new ideas for the development of the high efficiency IC engine technology.

Key words: internal combustion (IC) engines, conventional thermal cycle, thermal efficiency/charger transit between cylinders/steam assistance, split cycle/Rankine cycle

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