基于国六标准工况的车用柴油机N2O排放特性研究

刘冰

doi:10.3969/j.issn.1001-2222.2022.02.009

车用发动机 >

2022 , Vol. 0 >Issue 2: 54

DOI: https://doi.org/10.3969/j.issn.1001-2222.2022.02.009

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基于国六标准工况的车用柴油机N₂O排放特性研究

刘冰

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（招商局检测车辆技术研究院有限公司，重庆 401329）

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N₂O Emission Characteristics of Vehicle Diesel Engine Based on China Ⅵ Regulation Conditions

LIU Bing

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(China Merchants Testing Certification Vehicle Technology Research Institute Co.,Ltd.,Chongqing 401329,China)

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摘要

以1台4缸国六车用柴油机为研究对象，搭建排放测试系统，进行了国六阶段WHSC循环和冷热态WHTC循环试验，研究了标准循环工况下N₂O的排放特性。研究表明：原机排放中N₂O排放极低，但使用后处理系统后N₂O的排放量会大幅增加；WHSC循环中，从大负荷变化为小负荷时会形成N₂O排放峰值，在怠速工况下N₂O排放量很小；在WHTC循环中，冷态循环开始时由于冷启动排温低，N₂O排放很低，400 s以后冷态和热态的N₂O排放趋势基本一致，循环后期随排温升高N₂O排放增加，且热态的循环比排放量稍大于冷态。

关键词： 柴油机; 氮氧化物; 排放测量

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刘冰 . 基于国六标准工况的车用柴油机N₂O排放特性研究[J]. 车用发动机, 2022 , 0(2) : 54 . DOI: 10.3969/j.issn.1001-2222.2022.02.009

Abstract

Taking a 4-cylinder China Ⅵ vehicle diesel engine as the research object，the emission test system was built. And then the world harmonized steady state cycle (WHSC) and the world harmonized transient cycle (WHTC) of cold and hot cycle were conducted and the emission characteristics of N₂O were studied. The results show that the N₂O emission of engine is extremely low, but will greatly increase after introducing the aftertreatment system. The N₂O emission of WHSC cycle reaches the peak during the process from high load to low load and is very low under idle conditions. The N₂O emission of WHTC cycle is very low at the beginning of cold cycle due to the low exhaust temperature, and the N₂O emission trends of cold and hot cycle become consistent after 400 s. At the end of cycle, the N₂O emission increases with the increase of exhaust temperature and the specific emission of hot cycle is slightly larger than that of cold cycle.

Key words： diesel engine; nitrogen oxide; emission measurement

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