侯宇旭，葛蕴珊，王欣，苏盛，谭建伟，郝利君.增压直喷汽油机细小颗粒物排放特性研究[J].内燃机工程,2021,42(4):24-29.
增压直喷汽油机细小颗粒物排放特性研究
Emission Characteristics of Sub-23 nm Particles from a Turbocharged Direct-Injection Gasoline Engine
DOI：10.13949/j.cnki.nrjgc.2021.04.004
关键词:汽油机  细颗粒物  颗粒物数量  排放
Key Words:gasoline engine  fine particle  particle number  emission
基金项目:国家自然科学基金项目（51806015）;首都蓝天行动培育项目（Z181100005418012）
作者单位
侯宇旭，葛蕴珊，王欣，苏盛，谭建伟，郝利君 1.北京理工大学 机械与车辆学院，北京 100081
2.厦门环境保护机动车污染控制技术中心，厦门 361021 
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摘要:在一辆国六增压直喷、未安装颗粒捕集器的汽油车上分别采用常温(23℃）全球轻型车统一测试循环（worldwide harmonized light vehicles test cycle, WLTC）、常温(23℃）RTS95和低温(0℃）实际道路排放（real drive emission, RDE）测试循环对粒径在23nm以上和10nm以上的颗粒物数量排放进行了同步测试研究，以研究增压直喷汽油车的细小颗粒物（粒径10nm～23nm）排放特性。结果表明，在常温WLTC、RTS95及低温RDE循环测试中，10nm以上颗粒物的数量排放比国六标准规定的23nm以上颗粒物分别高32.4%、30.4%和15.6%。无颗粒捕集器时，急加速、减速和怠速工况细小颗粒在总颗粒物排放中的占比明显增加；冷起动和暖机阶段细小颗粒物的排放占比很低。细小颗粒主要在车辆充分暖机和三元催化器（three way catalyst，TWC）起燃后产生；较低的环境温度并未引起细小颗粒物的明显增加。
Abstract:A simultaneous test study on the particle number emission of particles whose diameters are greater than 23nm and 10nm was conducted on a China-6 certified, turbocharged, direct-injection gasoline engine vehicle without particulate filter using the worldwide harmonized light vehicles test cycle(WLTC) and RTS95 test cycle at ambient temperature(23℃), and real drive emission(RDE) test cycle at low temperature(0℃), to research the emission characteristics of sub-23nm particles from turbocharged direct-injection gasoline engine vehicles. The results showed that the emissions of numbers of particles whose diameters are above 10nm were 32.4%, 30.4% and 15.6% higher than those of China-6 standard required particles whose diameters are above 23nm in the ambient-temperature WLTC, ambient temperature RTS95 test cycle and low-temperature RDE cycle respectively. Without particulate filter, the percentage of sub-23nm particles in the total particle emissions increased significantly during harsh accelerations, decelerations, and idle conditions, but it was very low in the cold-start and warm-up stages. Sub-23nm particles mainly formed after the vehicle was fully warme-up and the three-way catalyst converter was fired. Lower ambient temperature was not beneficial to the formation of sub-23nm particles.
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