Calculation of Ignition Noise Level Caused by Plug Gap Breakdown

This paper describes the electromagnetic ignition noise caused by the gap breakdown of a plug. An ignition current which flows through the plug body is analyzed by making use of a Rompeweizel eizel formula for the spark resistance. From the analyses, effects of gap breakdown properties on the ignition currents are elucidated. A method to calculate the ignition current level from the relevant plug dimensions and the gap breakdown voltage is given, and the results are confirmed experimentally.