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。
The ionic current nearby the electrodes is detected by the spark plug. The cycle-by-cycle variations of the ionic current and of the pressure are researched. It shows that thc cycle-by-cycle variations of the ionic current duration are basically the same as the pressure＇s variations, and they are small. The coefficient of the first peak and position are large. The coefficient of the second peak value and position, integral value and duration between two peaks are middle in the parameters. The coefficients of both ionic current and pressure increase with air-fuel ratio. The coefficient of the ionic current duration is decreasing when the sampling times increases, and it remains constant if tile sampling times is larger than 60.
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