Research on Effect of Late Intake Valve Closing  Miller Cycle on Combustion and Emissions of Diesel Engine

doi:10.3969/j.issn.1000-1093.2015.08.002

Abstract

Abstract: The effect of late intake valve closing (LIVC) Miller cycle on combustion and emissions of D6114 diesel engine is analyzed based on a BOOST model. The results show that the closing time of intake valve can be delayed to decrease the compression pressure and the temperature, thus increasing the ignition delay period. Due to lacking of oxygen, the average in-cylinder temperature and soot emission increase. The boost ratio can be enhanced to compensate the loss of intake. It is also found that the late closing of LIVC, in conjunction with the increase in boost pressure and the delay of injecting time, can simultaneously reduce NO_x and soot emission. When the peak pressure is the same as that in the original engine, the fuel consumption is 4 g/(kW·h) lower than that the original engine, the soot emissions are reduced by 6%, and NO_x emissions are reduced by 31% by using the scheme of M60 and 2°CA of injecting time.

Key words: power machinery engineering, D6114 diesel engine, Miller cycle, NO_x emission, fuel efficiency

CLC Number:

TK42

WEI Sheng-li， LIU Xin， LENG Xian-yin， LIANG Yu， JI Kun-peng， WANG Fei-hu. Research on Effect of Late Intake Valve Closing Miller Cycle on Combustion and Emissions of Diesel Engine[J]. Acta Armamentarii, 2015, 36(8): 1384-1390.

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Research on Effect of Late Intake Valve Closing Miller Cycle on Combustion and Emissions of Diesel Engine

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