CAJ | 학술논문

为研究直接喷射(DI)式均质压燃（HCCI）爆震特性，进行了台架试验。改造了一台传统双缸柴油机的供油系统、点火系统、进排气机构，使其具有缸内直喷乙醇汽油混合燃料HCCI燃烧模式。根据该发动机台架的特点与缸压信号特征，建立了描述乙醇汽油HCCI燃烧的爆震模型，从模型中提取了爆震强度（KI），并进行了试验测量。结果表明：随乙醇在混合燃料中体积分数的升高，平均KI和爆震概率均有降低，爆震始点推后；爆震工况的当量比范围变窄，爆震工况上下边界互相靠拢。该结果有利于提出更合理的发动机喷射控制策略。
위연구직접분사(DI)식균질압연（HCCI）폭진특성，진행료태가시험。개조료일태전통쌍항시유궤적공유계통、점화계통、진배기궤구，사기구유항내직분을순기유혼합연료HCCI연소모식。근거해발동궤태가적특점여항압신호특정，건립료묘술을순기유HCCI연소적폭진모형，종모형중제취료폭진강도（KI），병진행료시험측량。결과표명：수을순재혼합연료중체적분수적승고，평균KI화폭진개솔균유강저，폭진시점추후；폭진공황적당량비범위변착，폭진공황상하변계호상고롱。해결과유리우제출경합리적발동궤분사공제책략。
Knocking characteristics were investigated by using engine bench tests for a combustion of DI-HCCI (direct-injection homogeneous charge compression ignition) with blend fuels of ethanol and gasoline. Some improvements were done to a traditional two-cylinder diesel engine in fuel supply system, ignition system, and inlet and exhaust system. A knock model was established according to the engine bench tests and the cylinder pressure signals to describe ethanol and gasoline HCCI combustion. Knock intensity (KI) was drawn from the model and then was measured in the tests. The results show that the average KI and the knock probability signiifcantly decrease with the blending ratio of ethanol and gasoline, i.e. the percentage of ethanol increases, while the knock starting phase retards. Knock boundaries also narrow down with high blending ratio, while the upper and lower boundaries move towards each other. Those results could lead to the development of better fuel injection strategies.