增压直喷是实现汽油机节能的有效手段，而超级爆震是进一步提高功率密度的主要障碍。超级爆震和早燃是两种不同的燃烧现象。超级爆震是高功率密度内燃机中的一种强烈的敲缸现象，常发生在低速、大负荷工况，具有随机性、偶发性和破坏性。早燃是火花点火内燃机中点火前出现着火的异常燃烧现象。早燃不一定导致超级爆震，但超级爆震前一定发生了早燃。抑制超级爆震的一条重要途径是杜绝早燃。早燃的诱发源主要有机油液滴和颗粒物。燃油和机油的组分与物理化学性质对超级爆震发生频次也有着重要影响。%Boost and direct injection are effective measurements for energy saving in gasoline engines, while super-knock has become the main obstacle for further improving power density. Pre-ignition and super-knock are two different combustion phenomena. Super-knock is a kind of severe engine knock in high power density internal combustion engine, which generally occurs at low-speed, high-load operating conditions with stochastic, sporadic and destructive. Pre-ignition is a abnormal combustion phenomenon in spark ignition engine that ignition occurs before the spark timing. Pre-ignition itself does not always lead to super-knock, however, pre-ignition accures before super-knock. To eliminate pre-ignition is an effective approach to suppress super-knock. The origins of pre-ignition include oil droplet and particle. The composition and physicochemical properties of fuel and oil affect seriously the frequency of super-knock.
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