Research on emissions from in-use diesel bus in Shenzhen
深圳市在用柴油公交车排放研究

Taking bus as an example, three on-road vehicle emission tests of high-duty diesel vehicles (HDDVs) were conducted using OBS-2200 and ELPI (electrical low pressure impactor) in Shenzhen city. The emission factors of NOx and PM, fuel consumption were calculated accurately, furthermore, the impacts of different roads and different driving patterns on emissions of NOx and PM, fuel consumption were analyzed. The results show that the traffic condition on highway in Shenzhen city is good so that the emissions are effectively reduced. The emission factors of NOx and PM on sub-road are 16.85 g/km and 3.24 g/km,respectively, higher than the other roads. The acceleration pattern causes higher emissions and fuel consumption than the other driving patterns, the mass emission rate of NOx and PM are 137.50 mg/s and 37.65 mg/s,respectively, the fuel consumption rate is 15.15 L/h. The emissions of NOx and PM are higher when the vehicle accelerates at high speed than those when the vehicle starts.