基于循环的缸内直喷乙醇HCCI燃烧的瞬态空燃比特性研究  

Research on Cycle-by-Cycle Real-Time A/F Ratio Characteristics for Ethanol DI-HCCI Combustion

作　　者：刘寅童[1] 邓俊[1] 史现[1] 吴志军[1] 李理光[1,2] 

机构地区：[1]同济大学汽车学院,上海200092 [2]同济大学中德学院,上海200092

出　　处：《内燃机工程》2013年第2期1-6,共6页Chinese Internal Combustion Engine Engineering

基　　金：国家"九七三"重点基础研究发展计划项目(2007CB210005);国家自然科学基金项目(51006075.51076118);高等学校创新引智111计划项目(B08019);上海市重点学科建设项目(B303)

摘　　要：考虑到HCCI燃烧模式对于循环间变动很敏感,基于瞬态CO_2/CO和HC排放测试仪,利用缸内直喷HCCI发动机台架,对乙醇HCCI燃烧循环间的排放及瞬态空燃比进行检测,并采用数学统计的方法分析连续循环的瞬态空燃比变化特性。研究结果表明:喷油量的变化对瞬态空燃比的波动影响最大,发动机转速和进气温度的影响依次降低;瞬态空燃比与缸内燃烧压力峰值显著相关,当瞬态空燃比上升时,缸压峰值降低,反之亦然。In consideration of HCCI is very sensitive to cycle-by-cycle variation, fast CO2/CO, HC and NO3 measurement systems were employed to detect transient emissions and real-time air/fuel ratios in the ethanol DI-HCCI combustion engine bench test. Based on the statistical method, cycle-by-cycle air/fuel ratio variation was analyzed. Results show that the influence of injection delivery on real-time air/fuel ratio is larger than those of engine speed and intake temperature. There is a close correlation between cycle-by-cycle air/fuel ratio and in-cylinder peak pressure, as the real-time air/fuel ratio increases the in-cylinder peak pressure decreases and vice verse.

关 键 词：内燃机 乙醇 均质充量压燃 瞬态空燃比 瞬态排放 燃烧循环 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]