中文摘要：

针对均质压燃（HCCI）发动机高负荷易爆燃的问题，在一台改造过的柴油机上加装CO2引入装置，进行HCCI燃烧试验。结果表明，引入高体积分数的CO2能够有效抑制HCCI发动机的爆燃并拓宽高负荷的工况范围，但随CO2体积分数增大，发动机低负荷失火可能性增加，综合对燃烧边界和负荷范围的影响，CO2体积分数应控制在1％左右。

英文摘要：

HCCI engine is prone to have a knock at high loads limiting its power output. In order to control its knock at high loads, a CO2 apparatus was installed to verify the feasibility of ingesting CO2 into the intake to appease engine knoCk on an engine beneh. HCCI eombustion tests were conducted on the fourth cylinder of a modified 4-cylinder diesel engine. The experimental results indicated that under steady engine speed of 1 400 r/min and fixed fueling rate, high volume fraetion of CO2 ean deerease the peak values of HCCI combustion cylinder pressures and heat release rates gradually, increase causing combustion duration, ease engine knock and enlarge the operating range at high loads effectively. However, the probability of engine misfire increases with the increase of the volume fraetion. For the tradeoff of knock and misfire, the volume fraction of CO2 should be about 1%.