利用发动机火花塞作为测量电极检测燃烧中电极附近的离子电流,对其特征参数与压力循环变动对比表明,离子电流持续时间与压力循环变动系数最小,且规律一致;离子电流第一峰值和位置循环变动最大;第二峰值和位置、积分值和两峰之间时间的循环变动居中;所有特征参数和压力循环变动系数均随混合气浓度变稀而增加;离子电流持续时间循环变动系数随采样次数的增加而减小,当采样数大于60后,其值基本保持不变。 Using the spark plug of the engine as the measuring electrode to detect the ion current in the vicinity of the electrode during combustion, the comparison between the characteristic parameters and the pressure cycling shows that the ionic current duration and the pressure cycling fluctuating coefficient are the smallest and have the same laws; the first peak of ion current and the position cycle change Maximum; the second peak and the position, the integral value and the time between the two peaks in the cycle of changes in the center; all the characteristic parameters and the pressure cycle variation coefficient increases with the concentration of the mixed gas increased; ion current duration of the cycle variation coefficient increases with the number of samples And decreases, when the number of samples is greater than 60, its value remains unchanged.