中南大学学报（自然科学版）2017，Vol.48Issue(5)：1384-1390,7.DOI:10.11817/j.issn.1672-7207.2017.05.034
路试状态汽油机缸内热功转换过程性能及影响因素的检测与分析
Diagnostics and analysis of heat to work conversion process and major influencing parameters of IC engine under road test conditions
摘要
Abstract
A new approach was demonstrated which enables continuous detection and judgment of multi controlling and performance parameters in an automotive IC engine under actual road testing conditions. The transient performance parameters of engine were obtained from the typical road testing operations. Steady state engine tests were conducted to help understanding what were observed during the transient tests. The results show that 50% burning position and the relative air-fuel ratio (AFR) are the two most important key factors for the heat to work conversion efficiency in both conditions. The high pressure loop thermal efficiency produces a peak when 50% burning position is located at about 10° crank angle after the top dead center. In addition to the influencing trend of the spark timing over the 50% burning position, other parameters such as engine speed, load, burnt mass fraction and relative AFR also have significant influence. The relative air-fuel ratio errors observed during the transient tests are caused by the poor estimation of the residual gas fraction in the cylinder, and the spark timing is also identified to exercise dramatic and unreasonable changes under certain circumstances, resulting in significant drop in the thermal efficiency.关键词
汽油机/瞬变工况/燃烧放热规律/热功转换效率Key words
gasoline engine/transient process/law of combustion and heat release/heat to work conversion efficiency分类
能源科技引用本文复制引用
唐琦军,刘敬平,付建勤,易鹏,朱国辉..路试状态汽油机缸内热功转换过程性能及影响因素的检测与分析[J].中南大学学报（自然科学版）,2017,48(5):1384-1390,7.基金项目
国家自然科学基金资助项目(51376057) （51376057）
国家重点基础研究发展计划(973计划)项目(2011CB707201) (Project(51376057) supported by the National Natural Science Foundation of China （973计划）
Project(2011CB707201) supported by the National Basic Research Development Program (973 Program) of China) （2011CB707201）
