润滑油灰分对直喷汽油车GPF性能影响的试验研究  

An Experimental Study on the Impact of Lubricant Ash onGasoline Particle Filter Performance of GDI Vehicle

作　　者：潘金冲 华伦 张文彬[2] 林延松 张云龙[2] Pan Jinchong;Hua Lun;Zhang Wenbin;Lin Yansong;Zhang Yunlong(Suzhou Automotive Research Institute(Wu Jiang),Tsinghua University,Suzhou 215200;Tsinghua University,State Key Laboratory of Automotive Safety and Energy,Beijing 100084)

机构地区：[1]清华大学苏州汽车研究院(吴江),苏州215200 [2]清华大学汽车安全与节能国家重点实验室,北京100084

出　　处：《汽车工程》2019年第5期487-492,513,共7页Automotive Engineering

基　　金：汽油车颗粒物捕集与清洁排放集成技术项目(2017YFC0211000);江苏省青年基金项目(BK20150391)资助

摘　　要：为开发汽油车颗粒捕集器(GPF)快速老化方法,评价GPF的耐久特性,分别在发动机与整车转鼓台架上试验研究了GPF的快速积灰方法和GPF对缸内直喷(GDI)汽油车颗粒物排放、背压、油耗的影响,最后用CT与XRF对灰分的分布与成分进行了分析。结果表明:GPF的积灰效率会随着时间变化逐步上升,最终达到30%左右的稳定值;装有GPF的整车在世界统一的轻型车测试循环(WLTC)下可满足国六颗粒物排放限值要求;随着灰分的不断积累,GPF对颗粒物质量(PM)与数量(PN)仍旧可以保持较高的过滤效率,分别为82%和99%;灰分累积对GPF的背压上升会有一定的影响,最大为6.5 kPa;在WLTC循环测试下GPF内的灰分增加对整车油耗影响并不明显,最大为1.25%;灰分主要组成物质为CaO和P_2O_5,主要沉积在GPF末端特别是在中心区域,为总含量的71.2%。In order to develop a rapid aging method and to evaluate the durability of GPF,an accelerated ash depostion method of GPF is developed in this study.Based on the accelerated ash deposition method,the effects of GPF ash accumulation on particle emissions,back pressure,and fuel consumption of a GDI vehicle are studied on the engine test bench and the chassis dynamometer.Finally,the ash distribution and composition are analyzed by computed tomography(CT)and x-ray fluorescence(XRF).The test results show that the ash deposition efficiency of the GPF is increasing over time and finally stabilizes at about 30%.The vehicle equipped with GPF can meet CN6 particle emission limits under WLTC test cycle.With the ash accumulation in the GPF,the GPF can maintain its filtration efficiency,which is 82% for PM and 99% for PN.The ash accumulation in the GPF can increase the GPF back pressure,with the maximum value of 6.5 kPa,while it has little influence on the vehicle fuel consumption according to the test results of WLTC test cycle,with the maximum of 1.25%.The ash is mainly composed of CaO and P2O5 at a content of 71.2% of the total mass,which is mainly deposited at the end,especially in the central area of GPF.

关 键 词：缸内直喷汽油车 汽油车颗粒捕集器(GPF) 快速积灰 世界轻型车瞬态循环(WLTC) 耐久 

分 类 号：U467.2[机械工程—车辆工程]