In this paper,the emission factors of four motor vehicles in Hong Kong are developed based on the on-road emissions measurement.An exhaust gas measurement system is set up and used in the on-road tests,which enables the direct and continuous determination of the exhaust emissions from vehicles running on the road.Using this system the instantaneous concentrations of exhaust gases,smoke intensity,air-fuel ratio,engine speed,vehicle speed,fuel consumption rate,etc,were recorded during the tests under realistic road conditions.The instantaneous emissions are integrated over a number of driving segments for obtaining the emission factors,and the effects of average speed of each segment and pay load were studied.%在实际道路行驶中测量了香港地区的汽车排放水平.选择了4部有代表性的车辆,两部汽油车,分别为无催化转换器和有催化转换器;两部柴油车,分别为轻型车和双层公共汽车.在车辆上安装了一套废气排放实时测量系统,可以在汽车行驶中连续测量汽车的瞬时气体排放和哈特里奇(Hartridge)烟度、空燃比、发动机转速、汽车行驶速度、油耗率等.利用多次测得的以上数据,把瞬态排放值经过积分得到了平均的汽车排放因子[g/km或者g/(kg fuel)].分析了平均车速和汽车载重量对平均排放因子的影响.
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