柴油机NO_x排放控制技术研究及性能优化  

Research on NO_x Emission Control Technology of Diesel Engine and Its Performance Optimization

作　　者：侯献军[1,2] 李孟孟[1,2] 杜松泽[1,2] 莫丽蓉[1,2] 许京[1,2] 

机构地区：[1]现代汽车零部件技术湖北省重点实验室,武汉430070 [2]汽车零部件技术湖北省协同创新中心,武汉430070

出　　处：《武汉理工大学学报（交通科学与工程版）》2016年第6期958-962,967,共6页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：湖北省自然科学基金重点项目资助(2013CFA104)

摘　　要：研究高压共轨、增压中冷和废气再循环技术对发动机NO_x排放及整机性能的影响,并将3种机内净化技术联合运行以优化发动机的综合性能.结果表明,推迟喷油正时,增加喷油脉宽、降低增压压力和进气温度、增加EGR率都会降低柴油机NO_x排放;优化后,最佳技术参数组合为:喷油正时为17℃A,喷油脉宽为1.75ms,增压压力为240kPa,增压温度为45℃,EGR率为15.2%.NO_x排放从11.38g/(kW·h)降低到3.22g/(kW·h),此时经济性改善0.85%,动力性与原机相当.The influence of high pressure common rail technology,turbocharged inter-cooled technology and Exhaust Gas Recirculation（EGR）technology on diesel engine NOxemission and engine performance is studied in this paper.The engine performance is optimized by combining three types of internal-engine purification technologies.The research shows that the diesel engine NOxemission can be reduced by delaying the injection timing,increasing the width of fuel injection pulse,reducing the supercharging pressure and inlet temperature as well as increasing the EGR rate.After the optimization of engine performance,the injection timing is 17°;the fuel injection pulse width is 1.75ms;the boost pressure and temperature are 240 kPa and 45 degrees,respectively;and the EGR rate is 15.2%.The resulting diesel engine NOxemission reduces from 11.38g/（kW·h）to 3.22g/（kW·h）,the fuel economy improves by 0.85%,and the power performance decreases by 0.28%.Besides,the power characteristic of the optimized engine is similar to that of the original engine.

关 键 词：NOX排放 机内净化技术 性能优化 GT-POWER 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]