改进型离子电流检测系统在汽油机爆震检测中的应用研究

发布时间：2018-06-26 01:32

本文选题：离子电流 + 爆震　；参考：《汽车工程》2016年10期

【摘要】：采用一种改进型的串联式离子电流检测系统,在一台1.3L四缸增压汽油机上开展了离子电流信号的典型特性,尤其是爆震工况下特性的试验研究。结果表明:该检测系统离子电流的频率特性可较好地判定中强爆震工况,但在轻微爆震工况有一定的局限;离子电流积分值能进一步提高爆震工况判定的准确率,达到87.2%。针对爆震强度的识别,离子电流峰值和平均幅值与爆震强度有很强的正相关性,采用加权平均的数学方法能优化离子电流爆震关键值与爆震强度的相关系数,使其由0.811提高到0.843。
[Abstract]:Using an improved series ion current detection system, the typical characteristics of ion current signal in a 1.3L four-cylinder turbocharged gasoline engine are studied, especially under the condition of detonation. The results show that the frequency characteristics of ion current in the system can be used to determine the medium and strong detonation conditions, but there are some limitations in the light knock conditions, and the ion current integral value can further improve the accuracy of determining the detonation conditions, reaching 87.2 percent. For the recognition of detonation intensity, the peak and average amplitude of ion current have strong positive correlation with detonation intensity. The correlation coefficient between the critical value of ion current and the detonation intensity can be optimized by using the weighted average mathematical method, and the correlation coefficient between the critical value of ion current and the detonation intensity can be improved from 0.811 to 0.843.
【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) KSPG教席基金资助
【分类号】：U464.171

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