中文摘要：

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℃A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．

英文摘要：

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.