中文摘要：

用开发的气体喷射系统,研究了缸内喷射CO_2对两段喷油实现的准均质压燃(HCCI)燃烧排放的影响。结果表明:通过调节CO_2的喷射始点和喷射量,可以有效控制NO_x排放。随着缸内CO_2喷射始点的提前,燃烧相位推迟,NO_x排放降低。在缸内喷射始点为-150°CA ATDC时,随着CO_2循环喷射量的增大,缸内最高平均温度降低,燃烧相位推迟,最大压力升高率和指示热效率变化不大,而由于滞燃期的增大,放热率峰值反而比原机略高;NO_x排放减小,HC和CO排放增大,烟度变化比较小。

英文摘要：

Effect of CO_2 in-cylinder injection on combustion and emission characteristics of diesel Quasi-Homogeneous Charge Compression Ignition (HCCI) combustion was studied by using a gas injection system.The Quasi-HCCI combustion mode was realized by two-pulse diesel injection.Ex- perimental results reveal that,NO_x emission can be effectively reduced by adjusting CO_2 injection timing and quantity.With advance of CO_2 injection timing,combustion phase delays and NO_x de- creases.As CO_2 cyclic injection quantity...