汽车工程

汽车工程 ›› 2019, Vol. 41 ›› Issue (5): 493-498.doi: 10.19562/j.chinasae.qcgc.2019.05.003

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基于WLTC和NEDC循环的轻型车氨排放特性研究*

罗佳鑫1, 崔健超2, 谭建伟3, 杨正军1, 朱庆功1   

  1. 1.中国汽车技术研究中心,天津 300300;
    2.一汽丰田技术开发有限公司,天津 300462;
    3.北京理工大学机械与车辆学院,北京 100081
  • 收稿日期:2018-05-23 发布日期:2019-06-05
  • 通讯作者: 谭建伟,实验师,博士,E-mail:tanjianwei@bit.edu.cn
  • 基金资助:
    国家自然科学基金(51676017)资助

A Research on Ammonia Emission Characteristics of Light-dutyVehicles Based on WLTC and NEDC Cycles

Luo Jiaxin1, Cui Jianchao2, Tan Jianwei3, Yang Zhengjun1, Zhu Qinggong1   

  1. 1.China Automotive Technology and Research Center, Tianjin 300300;
    2.FAW Toyota Research & Development Co., Ltd., Tianjin 300462;
    3.School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081
  • Received:2018-05-23 Published:2019-06-05

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摘要： 选择3辆轻型汽油车进行了基于WLTC和NEDC循环下的排放试验,对其常规污染物和氨的排放特性进行了分析。结果表明:氨是发动机原始排气进入三元催化器后发生氧化还原反应的副产物;持续时间较长的加速工况是氨生成的主要工况,此时原排气中较高浓度的CO在三元催化器内提供了较强的还原环境,而导致氨的生成;随着行驶里程的增加,氨排放呈上升趋势;低温环境下更容易产生较高的CO与氨排放。

关键词: 氨排放特性, WLTC循环, NEDC循环, 三元催化器

Abstract: Three light-duty gasoline vehicles are selected to conduct the emission tests based on WLTC and NEDC cycles to analyze the emission characteristics of regular pollutants and ammonia. The results show that ammonia is a byproduct of oxidation-reduction reactions, which occur when the initial exhaust of engine enters into three-way catalytic converter (TWC). The main condition for ammonia formation is long-duration acceleration, when relatively high concentration of CO provides a relatively strong reduction environment in TWC, leading to the forming of ammonia. The ammonia emission shows a rising trend as the mileage increases and high CO and ammonia emissions are more likely to occur under low temperature environment.

Key words: ammonia emission characteristics, WLTC cycle, NEDC cycle, three-way catalytic converter