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国Ⅳ柴油公交车在实际道路上的排放特征

Keywords: 柴油公交车,车载测试,排放因子,尾气排放

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Abstract:

应用车载式尾气排放测试设备对北京国Ⅳ排放标准的柴油公交车在实际道路上的尾气排放特征进行实测研究,测试时间为10645s,行驶里程达51.3km,共获得10645组有效数据,测试数据能反映车辆在实际道路上的排放特征.车辆在实际道路上尾气排放NOx、CO、总碳氢化合物(totalcarburetedhydrogen,THC)和颗粒物(particulatematter,PM)的排放因子分别为(11.02±1.46)、(1.44±0.12)、(0.038±0.01)和(0.053±0.03)g/km.车辆的油耗、排放状况与车辆的行驶状态等因素有密切关系:车速越快,加速度越大,油耗速率越高;NOx排放随工况点分布与油耗速率的分布趋势基本相似;CO排放速率在低速和减速工况下较低,车速超过30km/h及加速区域排放升高;THC高排放主要集中在车速低于30km/h的加速区域。

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