国六重型柴油车挥发性有机物排放特性

选取5辆典型国六重型柴油车，进行基于C-WTVC的挥发性有机物（VOCs）排放测试，分析了包括7种苯系物以及14种醛酮类物质的比排放量.结果表明，甲苯、苯、苯乙烯是国六重型柴油车苯系物排放的主体物质，占总量的60%~86%；而甲醛、乙醛、苯甲醛是醛酮污染物的主要物质，占总量的72%~87%.在同时包含市区、市郊和高速综合工况的试验车会产生较高的苯系物和醛酮类物质的排放，苯、苯乙烯在综合工况下的比排放量分别为处于市郊工况车型的1.25倍、1.45倍，市区占比为40%的货车具有最高的甲醛比排放量20.84mg/（kW×h），有超甲醇车甲醛排放限值的风险；在市郊工况下车型的甲苯、乙醛排放平均分别为其余车型的1.65倍、2.1倍.测试车辆的臭氧潜势均值达到（249.53±10） mgO₃/（kW×h）.

Emission characteristics of volatile organic compounds from heavy duty diesel vehicles

Five heavy duty diesel vehicles were selected for C-WTVC cycle test. Volatile organic compounds (VOCs), including 7 benzene series compounds and 14 aldehydes and ketones, were collected under the whole cycle. The results showed that toluene, benzene and styrene were the main pollutants of benzene series emissions from national six heavy duty diesel vehicles, accounting for 60% ~ 86% of the total; while formaldehyde, acetaldehyde and benzaldehyde were the main pollutants of aldehydes and ketones, accounting for 72% ~ 87% of the total. The specific emissions of benzene and styrene were 1.25 and 1.45 times of those in suburban driving mode respectively. The truck with 40% of urban area has the highest specific formaldehyde emission of 20.84mg/(kW×h). The emission of toluene and acetaldehyde is 1.65 and 2.1 times higher than that of other vehicles under suburban conditions. The average ozone potential of the vehicle is (249.53 ±10) mgO₃/(kW×h).