为了研究生物柴油的排放情况,在一台单缸直喷柴油机和一台四缸涡轮增压直喷柴油机上进行了排放对比试验。分析了柴油机燃用生物柴油和柴油的排放特性。研究结果表明:与柴油相比,生物柴油HC排放明显降低;不同负荷下生物柴油对CO排放无影响;生物柴油NOX排放明显增加。小负荷工况时,碳烟排放基本相同。而在大负荷时,生物柴油碳烟排放降低。 In order to study the emissions of biodiesel, a single-cylinder direct-injection diesel engine and a four-cylinder turbocharged direct injection diesel engine were compared on emission tests. The emission characteristics of diesel engine using biodiesel and diesel fuel were analyzed. The results showed that compared with diesel, HC emission of biodiesel significantly decreased; biodiesel had no effect on CO emission under different loads; and the emission of NO x from biodiesel significantly increased. Small load conditions, soot emissions are basically the same. At heavy loads, biodiesel soot emissions are reduced.