An analytic study of applying Miller cycle to reduce NO_x emission from petrol engine

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• 作者：Yaodong Wang ; Lin Lin ; Anthony P. Roskilly ; Shengchuo Zeng ; Jincheng Huang ; Yunxin He ; Xiaodong Huang ; Huilan Huang ; Haiyan Wei ; Shangping Li ; et al.
• 关键词：Petrol engine ; Miller cycle ; NO_x emissions ; Analytic study
• 刊名：Applied Thermal Engineering
• 出版年：2007
• 期刊代码：8_13594311
• 类别：ce
• 出版时间：August 2007
• 卷：27
• 期：11-12
• 页码：1779-1789
• 文件大小：242 K

摘要

An analytic investigation of applying Miller cycle to reduce nitrogen oxides (NO_x) emissions from a petrol engine is carried out. The Miller cycle used in the investigation is a late intake valve closing version. A detailed thermodynamic analysis of the cycle is presented. A comparison of the characters of Miller cycle with Otto cycle is presented. From the results of thermodynamic analyses, it can be seen that the application of Miller cycle is able to reduce the compression pressure and temperature in the cylinder at the end of compression stroke. Therefore, it lowers down the combustion temperature and NO_x formation in engine cylinder. These results in a lower exhaust temperature and less NO_x emissions compared with that of Otto cycle. The analytic results also show that Miller cycle ratio is a main factor to influence the combustion temperature, and then the NO_x emissions and the exhaust temperature. The results from the analytic study are used to analyse and to compare with the previous experimental results. An empirical formula from the previous experimental results that showed the relation of NO_x emissions with the exhaust temperature at different engine speed is presented. The results from the study showed that the application of Miller cycle may reduce NO_x emissions from petrol engine.