This paper describes a system for preignition in motorcycle engine using spark plus as a detecting probe, the author carries out researches on a method how the ionic current coins into being.

• 摘要本文描述了一种直接利用火花塞电极作为传感器检测南方摩托车发动机早燃的方法，作者在文章中详细分析及讨论了离子电流的产生机理。