轿车用汽油发动机气缸内的可燃混合气,开始是由高压电火花点燃的,然后燃烧的火焰以电火花为中心向外传播,并将燃烧室内混合气引燃,这种燃烧过程为正常燃烧。但是,当发动机维护保养以及汽车使用不当时,则有可能造成在正常的燃烧火焰没有到达之前,其余未被点燃的混合气发生自燃,由于这部分自燃混合气所产生的高压波与正常推进的火焰前锋相冲突,使发动机的活塞、连杆、气缸、曲轴等机件发生强烈的震动,从而形成了强烈的缸内敲击声,这种现象就是爆震。 Combustible mixture gas in the cylinder of a gasoline engine for a car is initially ignited by a high-voltage spark, and then the flames of the combustion are spread outwards centered on the spark, and the mixture in the combustion chamber is ignited. The combustion process is normal combustion . However, when the engine maintenance and improper use of the car, it may cause the normal combustion flame did not arrive before the rest of the unburned gas mixture spontaneous combustion, as part of the spontaneous combustion of high-pressure gas mixture with the normal advance Flames striker conflict, so that the engine piston, connecting rod, cylinder, crankshaft and other parts of a strong vibration, resulting in a strong percussion cylinder, this phenomenon is detonation.