基于简易瞬态工况法的在用汽油车排放特性试验研究

高冬冬; 罗马吉; 刘成

doi:10.3969/j.issn.1001-2222.2021.01.015

车用发动机 >

2021 , Vol. 0 >Issue 1: 87

DOI: https://doi.org/10.3969/j.issn.1001-2222.2021.01.015

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基于简易瞬态工况法的在用汽油车排放特性试验研究

高冬冬 ,
罗马吉 ,
刘成

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（武汉理工大学现代汽车零部件技术湖北省重点实验室，湖北武汉 430070）

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Emission Characteristics of In-Use Gasoline Vehicle Based on Short Transient Driving Cycle

GAO Dongdong ,
LUO Maji ,
LIU Cheng

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(Hubei Provincial Key Laboratory of Modern Auto Parts Technology,Wuhan University of Technology，Wuhan 430070，China)

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摘要

以2009年捷达车1.6 L自然吸气汽油机为研究对象，搭建汽车尾气测试转鼓试验台架，安装自主研发的EGR系统和市售的三元催化器控制装置，结合GB 18285—2018 《汽油车污染物排放限值及测量方法（双怠速法及简易工况法）》中简易瞬态工况法进行排放试验，综合评价了以上排放控制技术对在用轻型汽油车排放特性的影响。结果表明：发动机引入EGR气体后，NO_x排放明显下降，随着EGR阀开度不断增大，NO_x排放下降幅度也逐渐增加，CO和HC排放呈现先降低后升高趋势；更换三元催化器后，有害排放污染物中CO、HC和NO_x明显降低，CO排放近乎零排放，催化转化效果极其明显；三元催化器结合EGR系统后，有害污染物排放均有所降低，在EGR阀开度2%~10%范围内，随着EGR阀开度增大，NO_x排放明显减低，CO和HC排放略有上升的负面效果因三元催化器净化而抵消。

关键词： 汽油车; 简易瞬态工况法; 废气再循环; 催化转化器; 排放特性

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高冬冬 , 罗马吉 , 刘成 . 基于简易瞬态工况法的在用汽油车排放特性试验研究[J]. 车用发动机, 2021 , 0(1) : 87 . DOI: 10.3969/j.issn.1001-2222.2021.01.015

Abstract

Taking the 2009 Jetta 1.6 L naturally aspirated gasoline engine as the research object, a rotating drum test bench for automobile exhaust gas testing was set up, and the self-developed EGR system and commercially available threeway catalysts were configured. The emission experiments were conducted according to the short transient driving cycle in the legislation of GB 18285-2018 named "Limits and Measurement Methods for Emissions from Gasoline Vehicles under Two-Speed Idle Conditions and Short Driving Mode Conditions". The effects of above-mentioned emission control technologies on emission characteristics of light-duty gasoline vehicle were comprehensively evaluated. The results show that the NO_x emission reduces significantly after the introduction of EGR. The NO_x emission reduces gradually and the CO and HC emissions decrease first and then increase with the increase of EGR valve opening. The CO, HC and NO_x emissions reduce significantly and the CO emission is near to 0 after the using of new three-way catalyst. The combination of three-way catalyst and EGR system also promotes the reduction of harmful pollutant emissions. In the range of 2%-10% EGR valve opening, the NO_x emission reduces significantly and the negative effects of slightly increasing of CO and HC emissions are counteracted due to the purification of threeway catalyst with the increase of EGR valve opening.

Key words： gasoline vehicle; short transient driving cycle; exhaust gas recirculation; catalyst; emission characteristic

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