实际道路工况和法规工况下中型柴油机排放特性的对比分析

分别按照北京城市客车的实际道路驾驶循环BJCBC和重型柴油机的法规试验循环ETC,对满足国Ⅲ标准的中型柴油机及装配相同型号柴油机的整车进行排放测试,研究试验工况对柴油机NO_x和PM排放特性的影响。研究结果表明:试验工况的变化对PM粒径浓度分布、NO_x瞬时排放浓度和瞬时排放率产生明显影响,而且BJCBC的排放评价结果远远偏离ETC的排放评价结果,所以在满足认证标准工况的基础上,应按照北京市典型工况对排放控制进行优化标定。

Comparative analysis of medinm-duty diesel engine emissions under BJCBC and ETC

In order to explore the effects of the testing condition on the PM and NO_x emission characteristics from the diesel engine, a medium-duty automotive diesel engine complying with the China emission standard stage Ⅲ and a vehicle equipped with this engine were tested according to the European Transient Cycle(ETC) and the Beijing City Bus Cycle(BJCBC) which was developed from the actual driving conditions of Beijing buses. The testing results show that the driving cycle has significant effects on the particle size concentration distribution of PM emission, and the results by BJCBC is dramatically different from those by ETC. Therefore, the emission control calibration of the bus engine should be optimized according to BJCBC besides meeting the certification standards.