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基于Rompe-Weizel火花电阻公式和火花塞的分布电容参数,建立了汽车点火系统次级线圈电容放电的等效电路模型,获得了火花塞间隙击穿过程中由于电容放电引起的火花电流的大小.分析了火花塞的结构尺寸及电阻的大小和位置,以及火花间隙的击穿电压对电容放电引起的火花干扰电流的影响.这对汽车的电磁兼容研究有一定的意义.“,”Based on Rompe-Weizel formula for the spark resistance and plug stray capacitance parameter, an equivalent secondary coil capacitive discharge circuit of an automotive was established, and the noise spark current level caused was obtained by the capacitive discharge when the plug gap was breakdown. Effects of the plug dimension, magnitude and location of the resistor, and the gap breakdown voltage on the spark current level were studied. This work done here is useful to research the automotive Electromagnetic Compatibility, interference and the deterioration effects of ignition noise on various electronic systems.