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业已知道,未燃烧CH总排放量中平均有30%以上是在活塞头部侧隙里产生的。这篇文章摘自于作者的博士论文。主要参变量是活塞头部高度,侧向间隙以及活塞顶边缘棱角形状。为这项研究总共提供了9种不同的活塞。试验时应用具有电磁控制气体取样阀的频闪观测式排气取样装置进行测量。将该电磁阀安装在排气门后不远的排气管上,测取了排气冲程时的CH浓度曲线。因为CH浓度曲线和活塞位置之间有一定的关系,所以在排气管中便可以了解活塞头部侧隙几何形状对CH排放量的影响。
It is already known that an average of more than 30% of the total unburnt CH emissions is generated in the piston head backlash. This article is taken from the author’s doctoral dissertation. The main variables are the piston head height, lateral clearance and the shape of the top edge of the piston. A total of nine different pistons were provided for this study. The test was performed using a stroboscopic exhaust sampling device with a solenoid-controlled gas sampling valve. The solenoid valve is mounted on the exhaust pipe not far behind the exhaust valve to measure the CH concentration curve at the exhaust stroke. Because of the relationship between the CH concentration curve and piston position, the effect of piston head backlash geometry on CH emissions can be seen in the exhaust pipe.