缸内直喷汽油机三效催化器对微粒排放影响规律的研究
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- 英文论文题名：The Three Way Catalyst Study on the Influence of Particle Emission of GDI Engine
- 论文作者：丁一峰 ; 李君 ; 刘宇 ; 尹乾熙
- 英文论文作者：Ding Yifeng ; Li Jun ; Liu Yu ; Yin Qianxi ; State Key Laboratory of Automobile Dynamic Simulation ; Jilin University
- 年：2016
- 作者机构：吉林大学汽车仿真与控制国家重点实验室;
- 论文关键词：缸内直喷汽油机 ; 三效催化器 ; 微粒排放
- 英文论文关键词：GDI engine ; three way catalyst ; particle emission
- 会议召开时间：2016-10-26
- 会议录名称：2016中国汽车工程学会年会论文集
- 英文会议录名称：Proceedings of 2016 SAE-China Congress
- 语种：中文
- 分类号：TK411.5
- 学会代码：QCGC
- 会议名称：2016中国汽车工程学会年会暨展览会
- 会议地点：中国上海
- 主办单位：中国汽车工程学会
- 学会名称：中国汽车工程学会
- 页数：4
- 文件大小：858k
- 原文格式：O
- 会议级别：全国
摘要
本文通过缸内直喷汽油机微粒测量试验,研究了怠速工况、额定转矩工况及常用工况下三效催化器对发动机尾气中微粒数量浓度及质量浓度的处理效率。研究结果表明,在怠速等低转速小负荷工况,三效催化器对粒径较小的核模态微粒的数量浓度和质量浓度均具有较高的处理效率。而随着转速及负荷的增加,其处理效率明显降低。主要原因是一方面随转速负荷提高,发动机原始排放中聚集态微粒增加,这种大粒径微粒不易被三效催化器氧化;另一方面空速增加导致微粒布朗扩散捕集作用减弱,使得三效催化器对微粒处理效率降低。
The trap efficiency of three way catalyst during different working conditions was got through GDI engine bench experiment.The results showed that,the TWC always had high processing efficiency on the particle number concentration and mass concentration(especially nuclei mode particles) when the engine was running at low speed and small load.But the processing efficiency decreased obviously with the increase of speed and load.The main reason is that engine exhaust aggregation particles increase with the speed and load increasing.The large size particle is not easy to be oxidation in three way catalyst relatively.On the other hand,the Brownian diffusion trapping effect weakened with airspeed increasing.And it leaded to lower trap efficiency.
The trap efficiency of three way catalyst during different working conditions was got through GDI engine bench experiment.The results showed that,the TWC always had high processing efficiency on the particle number concentration and mass concentration(especially nuclei mode particles) when the engine was running at low speed and small load.But the processing efficiency decreased obviously with the increase of speed and load.The main reason is that engine exhaust aggregation particles increase with the speed and load increasing.The large size particle is not easy to be oxidation in three way catalyst relatively.On the other hand,the Brownian diffusion trapping effect weakened with airspeed increasing.And it leaded to lower trap efficiency.
引文
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[3]Yoshitaka Ito,Takehide Shimoda,Takashi Aoki,et al.Advanced Ceramic Wall Flow Filter for Reduction of Particulate Number Emission of Direct Injection Gasoline Engines[J].SAE paper,2013-01-0836.
[4]刘志华,葛蕴珊,丁焰等.柴油机和LNG发动机颗粒物粒径分布特性研究[J].内燃机学报,2009,27(6):518-522.
[5]Nick Coplin,Alun Morgan and David Worth.Techniques for Repeatable Measurement of PM Emissions from Light Duty Gasoline Vehicles[J].SAE paper,2009-01-1766.
[2]Shi J P,Harrison R M.Characterization of Particles from a Current Technology Heavy-Duty Diesel Engine[J].Environmental Science and Technology,2000,34(5):748-755.
[3]Yoshitaka Ito,Takehide Shimoda,Takashi Aoki,et al.Advanced Ceramic Wall Flow Filter for Reduction of Particulate Number Emission of Direct Injection Gasoline Engines[J].SAE paper,2013-01-0836.
[4]刘志华,葛蕴珊,丁焰等.柴油机和LNG发动机颗粒物粒径分布特性研究[J].内燃机学报,2009,27(6):518-522.
[5]Nick Coplin,Alun Morgan and David Worth.Techniques for Repeatable Measurement of PM Emissions from Light Duty Gasoline Vehicles[J].SAE paper,2009-01-1766.