中文摘要：

通过开发的气体喷射系统，研究并对比了进气道和缸内喷射CO2对准均质压燃燃烧排放的影响．准HCCI燃烧由两段喷油实现．结果表明：随着缸内和进气道CO2循环喷射量的增大，缸内最高平均温度降低，燃烧相位推迟，最大压力升高率变化不大；NOx排放减小，HC和CO排放增大．等CO2喷射量下，NOx随着缸内CO2喷射始点的提前而减小；缸内喷射的HC和CO排放较进气道喷射的大．随着CO2循环喷射量的增大，进气道喷射的烟度开始变化不大，然后急剧上升；而缸内喷射的烟度变化不大．

英文摘要：

By using a gas injection system, CO2 was injected into the intake pipe and cylinder, respectively, and its effect on quasi-homogeneous charge compression ignition （HCCI） with two-pulse diesel injection was studied. The results revealed that, as CO2 cyclic injection quantities of both in-cylinder and intake injection increased, maximum average cylinder temperature decreased, combustion timing was delayed, while peak cylinder pressure rise rate slightly changed; NOx emission decreased, while HC and CO emissions increased. With the same CO2 injection quantity, NOx decreased as CO2 injection timing advanced; HC and CO emissions of in-cylinder injection were greater than those of intake injection. As CO2 injection quantity increased, smoke of intake injection first changed little and then increased dramatically; In contrast, smoke of in-cylinder injection remained nearly unchanged.