增压汽油机早燃在线检测与诊断  

Board Boosted Gasoline Engine Pre-ignition Diagnostic

作　　者：童孙禹[1] 贺孝愚 邓俊[1] 李理光[1,2] 

机构地区：[1]同济大学汽车学院 [2]同济大学中德学院,上海200092

出　　处：《同济大学学报（自然科学版）》2016年第10期1609-1616,共8页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金(51376139;51006075);博士点基金(20120072110015);上海科委项目(11DZ2260400);KSPG教席基金

摘　　要：基于缸内离子电流检测技术,在一台增压进气道多点喷射汽油机上研究了进气温度、负荷、点火提前角、空燃比对于早燃发生频率的影响.试验结果表明,在一定范围内提升进气温度并不会增加早燃发生频率,增大负荷及增大点火提前角将会增加早燃发生频率,缸内混合气加浓将有效抑制早燃发生频率但是会增加油耗.采用的离子电流检测技术,可以实时快速检测早燃循环.并与缸压阈值法相比,离子电流信号判断早燃更准确,能够识别全部早燃循环,包括燃烧压力较小的早燃循环,同时离子电流检测法能够在上止点前25°CA检测到早燃发生的特征信号,这为发动机采取早燃消除方法提供了技术可能.The experiment was conducted on a MPI boosted gasoline engine to analyze the influence of intake temperature, engine load, ignition timing and lambda on pre- ignition frequency on the basis of the in-cylinder ion-current detection. The results show that small variation of intake pressure will not increase pre-ignition events significantly. Higher engine load and advancing ignition timing will lead to higher pre-ignition frequency. In-cylinder enrichment will decrease its frequency but a higher fuel consumption instead. At the start of pre-ignition event, obvious ion current signal can be detected. Compared with the cylinder pressure threshold method, ion current detection can find out all the pre-lgnition events, combustion pressure including the cycles with lower Especially, the characteristic ioncurrent signal of pre-ignition can be detected 25℃A BTDC. This provides a potential control to suppress pre-ignition events for modern engines.

关 键 词：增压汽油机 离子电流检测 早燃检测 

分 类 号：TK417[动力工程及工程热物理—动力机械及工程]