国Ⅳ柴油公交车上海市道路NOx和超细颗粒排放

On road NOx and Ultrafine Particle Emission Characteristics of China IV Diesel Bus in Shanghai

摘要:

在上海市城区选定道路上开展国Ⅳ柴油公交车实际道路排放试验，研究该车实际道路行驶工况氮氧化物（NOx）及超细颗粒数量排放特征.结果表明：实际道路该车平均速度为20.59 km·h-1，NOx和超细颗粒数量排放因子分别为9.33 g·(km·辆)-1和5.78×1014个·(km·辆)-1；NOx排放主要集中在中高车速（>35~55 km·h-1）、大加速度（a>0.5 m·s-2）工况，超细颗粒数量排放主要集中在中高车速、大加速度工况；加速行驶模式下NOx和超细颗粒数量排放较高，不同行驶模式下粒径小于100 nm的颗粒数量排放差别较大.

Abstract:

The on road emission test of a China Ⅳ diesel bus was conducted on some specific roads of Shanghai to study the real world emission characteristics of NOx and ultrafine particle. The results show that the test bus has an average speed of 20.59 km·h-1, and NOx and ultrafine particle number emission factors are 9.33 g·（km·vehicle)-1 and 5.78×1014particles (km·vehicle)-1, respectively. The on road NOx emissions mainly concentrate at middle high speed (>35~55 km·h-1) and large acceleration (a>0.5 m·s-2) driving conditions, and ultrafine particle emissions concentrate at middle high speed (v>40 km·h-1) and large acceleration driving conditions. During acceleration mode, the emission rates of NOx and ultrafine particle number are relatively high. Ultrafine particle number emission rates of four driving modes vary obviously when the particle size is smaller than 100 nm.