| 国Ⅳ天然气公交车实际道路颗粒物排放特性 |
| 摘要点击 1985 全文点击 1125 投稿时间：2013-07-16 修订日期：2013-09-03 |
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| 中文关键词 压缩天然气 公交车 实际道路 车载 颗粒物排放 |
| 英文关键词 compressed natural gas (CNG) bus real road on road/on-board particle emission |
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| 中文摘要 |
| 采用车载排放测试系统对国Ⅳ天然气公交车进行了实际道路排放测试，研究其颗粒物排放特征及粒径分布随车速、加速度及比功率的变化规律. 结果表明，天然气公交车的颗粒物数量和质量排放率随车速的增加均逐渐升高，而排放因子均逐渐减小；怠速、低速、中速和高速工况下颗粒数量浓度均呈多峰对数分布，核态颗粒数在总颗粒数中占大多数比例. 随加速度的增大，颗粒物排放率逐渐升高；快加速工况颗粒物排放率明显高于匀速和慢减速工况，而后二者之间相差不大. 颗粒物的高排放集中在高车辆比功率（VSP）区间内，并随VSP绝对值的增大逐渐升高. |
| 英文摘要 |
| An on-road experimental research was made on a Chinese phase Ⅳ natural gas bus using a Portable Emission Measurement System (PEMS), and particle emission characteristics under different vehicle speed, acceleration and vehicle specific power were investigated. The results show that particle number and mass emission rates increase and their emission factors decrease while the speed of the bus rises. Particle number concentration of different sizes shows multimodal logarithmic distribution pattern when the bus runs on all operation conditions (idle, low speed, medium speed and high speed), and nucleation mode particle account for a large proportion in the total particle number. With the increase of acceleration, particle emission rate rises, and it is lower when the bus runs at constant speed or slow deceleration condition than that at the fast acceleration condition. Furthermore, particle emission rate increases against the absolute value of the vehicle specific power (VSP). |
