张秋华,黄昭明,陈伟国.燃油喷射压力对缸内直喷汽油车颗粒数量排放的影响[J].内燃机工程,2022,43(5):32-37.
燃油喷射压力对缸内直喷汽油车颗粒数量排放的影响
Effects of Fuel Injection Pressure on Particle Number Emission of A Gasoline Direct Injection Vehicle
DOI：10.13949/j.cnki.nrjgc.2022.05.005
关键词:缸内汽油直喷  颗粒数量  全球轻型车统一测试循环  聚类点工况  喷射压力  排放
Key Words:gasoline direct injection（GDI）  particle number（PN）  worldwide harmonized light vehicles test cycle（WLTC）  cluster operation point  injection pressure  emission
基金项目:安徽省高校自然科学研究重点项目（KJ2018A0698，KJ2020A0837，KJ2020A0909）；安徽省高校优秀拔尖人才培育项目（gxgnfx2018097）；国家双高校科研平台建设子项目及升级培育项目（Kjcxpt202005）
作者单位E-mail
张秋华* 合肥工业大学 汽车与交通工程学院，合肥 230009
芜湖职业技术学院 汽车与航空学院，芜湖 241006 		zhangqiuhua@whit.edu.cn 
黄昭明* 合肥工业大学 汽车与交通工程学院，合肥 230009
皖江工学院 机械工程学院，马鞍山 243031 		jimmymacy@163.com 
陈伟国 奇瑞汽车股份有限公司 发动机工程研究院，芜湖 241006  
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摘要:为探索直喷汽油机车辆冷起动后的颗粒物数量（particle number， PN）排放特性，选取了全球轻型车统一测试循环（worldwide harmonized light vehicles test cycle， WLTC）直喷汽油机聚类点工况，在发动机台架上试验研究了燃油喷射压力与喷油时刻对PN的影响规律，并基于台架的PN结果进行了整车WLTC测试循环的PN排放对比试验研究。试验研究结果表明，喷油提前角分布在240°~280°曲轴转角区间时，PN排放相对较低；提高喷射压力可使直喷汽油机PN排放降低约40%~70%；提高喷射压力后，WLTC测试循环下，直喷车低速段PN降低约40%，整个测试循环PN降低约30%。直喷车冷起动低负荷工况通过选取合理的喷油提前角和提高喷射压力，可大幅降低PN排放量。
Abstract:In order to explore the particle number（PN） emission characteristics of direct injection gasoline engine after cold start， the cluster operation points of worldwide harmonized light vehicles test cycle（WLTC） for direct injection gasoline engine were selected. The effects of fuel injection pressure and injection advance angle on PN emission were studied on engine test bench. And the PN emission of WLTC was compared based on the results of PN test bench optimization. The results show that the PN emission is relatively low when the injection advance angle is in the range of 240°~280° crank angle. And when the injection pressure is increased， the PN emission can be reduced by about 40%~70%. PN in the first phase of the direct injection vehicle decreased by about 40%， and the complete test cycle PN emissions decreased by about 30%. It can be concluded that the PN emission can be greatly reduced by selecting reasonable injection advance angles and increasing injection pressure under low load condition after vehicle cold start.
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