OBS 2200 on-board emission measurement system was used to analyze car emission in Tianjin's typical roads in busy time (17:00-18:00), common time (14:30-15:30) and free time (20:00-21:00), respectively, and the second by second emission rates of HC, CO and NO, were also obtained. The results demonstrated that the accelerations of vehicle were within -1.5~1.5m/s2, and the speeds of vehicle were within 0~70km/h generally. The highest emission rates of HC, CO and NOX were 0.0673g/s, 0.706g/s and 0.0178g/s, all of which concentrated within the operating conditions of high speed and high acceleration (v>30km/h, <7>0.5m/s2). Coefficients of determination between the emission rates (HC, CO and NO,) and VSP were 0.71,0.86 and 0.85, which showed that VSP can be referred as an indicator of vehicle emission.%利用OBS-2200车载测试系统,分别在高峰期、平峰期和低峰期的天津市典型路段进行了车载测试,并获得了碳氢化台物(HC)、一氧化碳(CO)和氮氧化物(NOx)等车辆排放的污染物的逐秒数据.结果显示在这3个时段内,车辆的加速度大都集中在-1.5～1.5m/s2,速度大都集中在0～70km/h,并且HC、CO和NOx的最高捧放率为0.0673、0.706和0.0178g/s,都集中在高速(速度(v)＞30km/h,加速度(a)＞0.5m/s2)工况范围内.通过拟合发现,HC、CO和NOx的排放率与比功率(Vehicle Specific Power,简称VSP)之间的拟台决定系数分别为0.71、0.86和0.85,相关性较高,说明VSP可以作为评价车辆排放率的一个重要参考性指标.
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