中文摘要：

研究目的是确定稀薄燃烧对于汽油机爆震倾向的影响，为稀燃发动机中增压的应用提供参考依据．试验在一台模拟增压的汽油机上进行，试验时通过改变燃料的辛烷值，直到出现轻微爆震的方法来确定发动机的爆震特性．结果表明，稀薄燃烧对于汽油机爆震的影响，根据关注目标的不同而有所差异：保持进气量不变，汽油机的爆震倾向会随着空燃比的增加而减小；输出功率保持不变，发动机的爆震倾向会随着空燃比的增加而略有增大。因此，为保证稀燃汽油机的动力输出而采用增压进气会使得发动机的爆震倾向增加，应用中需要同时采用其他技术措施抑制爆震的发生．

英文摘要：

To examine the influence of lean burn on knock trend of gasoline engine, tests were carried out on a simulated turbo-charged gasoline engine. Knock characteristics were determined by changing the octane number of the fuel supplied to the engine until audible knock hapened. The results show that the effect of lean bttm on engines knock depends on which parameter is concerned. With constant airflow, the knock tendency of the engine decreases with the ratio of air to fuel increasing. With constant power-output, knock tendency increases slightly with increasing ratio of air to fuel. So, applying turbo-charging to lean burn gasoline engine can make it more likely to knock at high load conditions. In the application other measures to supress knock should be considered.