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欧元六标准柴油和CNG重型车辆的受监管和不受监管的排放

Roberto Gioria¹, Tommaso Selleri^1,2, Barouch Giechaskiel¹

¹European Commission, Joint Research Centre (JRC), 21027 Ispra, Italy.

Transportation research. Part D, Transport and environment

|September 4, 2024

概括

这项研究表明,虽然欧元VI-D柴油和CNG巴士符合当前的标准,但它们在氧化和颗粒数等污染物方面超过了欧元7的建议限制. 在CNG巴士中,氨和甲排放量也较高.

科学领域:

环境科学环境科学
汽车工程汽车工程
大气化学大气化学

背景情况:

目前针对公共汽车的Euro VI-D排放标准可能不足以满足未来的环境目标.
压缩天然气 (CNG) 和柴油巴士在公共交通中很常见,因此需要对其排放情况进行比较.
温度变化可以显著影响车辆的排放,需要对一系列运行条件进行分析.

研究的目的:

为了比较符合欧元VI-D标准的柴油和CNG公交车的受监管和非受监管的污染物排放.
在不同温度 (-7°C至35°C) 下,根据欧盟委员会提出的欧元7限值评估公交车的排放量.
量化特定气体如甲 (CH4) 和氧化 (N2O) 对总体二氧化碳等效排放的贡献.

主要方法:

欧元VI-D柴油和CNG巴士的真实世界排放测试在温度范围为-7°C至35°C.
测量污染物包括氧化 (NOx),总碳化合物 (THC),甲 (CH4),一氧化碳 (CO),氨 (NH3),氧化 (N2O),甲 (HCHO) 和固体颗粒数 (SPN23,SPN10).
测量排放与欧元VI-D认证限值和拟议的欧元7限值的比较.

主要成果:

柴油和CNG巴士都符合欧元VI-D标准,但超过了建议的欧元7NOx和SPN10限制,特别是在冷启动时.
与柴油公交车相比,CNG公交车的NH3,CO和CH4排放量更高,超过了这些污染物提出的欧元7限制.
柴油公交车的排放量超过了N2O的欧元7规定的限制,而CNG公交车的CH4和N2O对二氧化碳相当的排放量有显著的贡献 (分别为4.6%和3.5%).

结论:

现有的欧元VI-D柴油和CNG巴士可能需要进一步的技术进步,以满足严格的欧元7排放标准.
燃气公交车在氨,甲和氧化排放方面存在挑战,需要有针对性的减排策略.
根据拟议的法规,固体颗粒数排放,特别是在23nm以下,和NOx仍然是根据拟议的法规对这两种公共汽车类型的改进的关键领域.

关键词:

欧元 7 欧元 7 欧元 7 欧元在 GHG 中,GHG 是不受监管的污染物不受监管的污染物小型电气系统 (PEMS) 是一个现实世界的排放量.他们是SPN SPN.

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