摘要
从发动机首次着火循环的单一循环特性分析入手，研究了以液化石油气（LPG）为燃料的电控喷射小型点燃式发动机低温冷起动首次着火循环的燃烧情况，当环境温度从-9～4℃变化时，对不同过量空气系数对冷起动的首次着火循环的影响进行分析，结果表明环境温度对冷起动首循环的HC排放有很大影响，而对着火或起动瞬态转速影响不大；过量空气系数直接影响发动机冷起动首循环的着火可靠性和HC排放，通过研究，得出保证此LPG发动机首次着火循环可靠起动时的最佳过量空气系数为0．74左右。
Based on the analysis of engine＇s first firing cycle （FFC） , this paper investigates the combustion characteristics of cold-start of a small EFI SI engine fueled with LPG. From analysis of the effects of excess air ratios on the first firing cycle at varying ambient temperature （ from - 9 ℃ to 4 ℃ ） , the following results are obtained. The ambient temperature has a great influence on HC emissions of the first cycle at cold start, while it has little influence on engine＇s ignition or start-up instantaneous engine speed. The excess air ratio directly influences both the FFC reliability and HC emissions. The optimum excess air ratio 0.74 for guaranteeing the successful cold start in the FFC of the LPG engine is found by the experimental study.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2005年第4期373-378,共6页
Journal of Combustion Science and Technology
基金
国家自然科学基金资助项目(50376034)
国家"十五"清洁汽车攻关资助项目(2003BA408B09A).
关键词
冷起动
液化石油气
首次着火循环
过量空气系数
cold-start
liquefied pretroleum gas
the first firing cycle
excess air ratio
