增压汽油机早燃在线检测与诊断

发布时间：2018-03-19 14:21

本文选题：增压汽油机　切入点：离子电流检测　出处：《同济大学学报(自然科学版)》2016年10期 　论文类型：期刊论文

【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.
[Abstract]:Based on the in-cylinder ion current detection technique, the effects of inlet temperature, load, ignition advance angle and air-fuel ratio on the frequency of early combustion were studied on a turbocharged inlet multi-point injection gasoline engine. Raising the inlet air temperature within a certain range will not increase the frequency of early combustion, and increasing the load and ignition advance angle will increase the frequency of early combustion. The concentration of gas mixture in cylinder can effectively suppress the occurrence frequency of early combustion but increase fuel consumption. The ion current detection technology can detect the early combustion cycle in real time and quickly. Compared with the cylinder pressure threshold method, the ion current signal is more accurate in judging early combustion. All the early combustion cycles, including those with low combustion pressure, can be identified, and the characteristic signals of early ignition can be detected by ion current detection at 25 掳CA before the up-and-down point, which makes it possible for the engine to adopt the method of early combustion elimination.
【作者单位】：同济大学汽车学院;同济大学中德学院;
【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
【分类号】：TK418

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