CAJ | 학술논문

利用电子低压冲击仪（EL PI）对一台满足国Ⅴ排放标准的缸内直喷汽油车进行了颗粒物排放特性研究。试验按照N EDC测试循环在转鼓试验台上进行，分别测量车辆在－15℃，－7℃和25℃下的颗粒物排放。通过对试验结果的研究表明：3个温度下，颗粒物的数量浓度随温度的下降大幅上升，粒径分布范围逐渐变大，均在相同粒径下出现峰值；颗粒物体积浓度随粒径的增大而增大；数量浓度对表面积浓度的影响大于体积浓度，尤其在－15℃下，这种影响更加显著。通过对颗粒物的瞬态排放结果的分析发现：3个温度下，颗粒物的排放主要集中在N EDC循环前200 s ，数量浓度随车辆的加速而上升，随减速而下降；在－15℃下，在整个N EDC循环的加速工况均出现表面积浓度的排放峰值，且峰值之间较为接近。
이용전자저압충격의（EL PI）대일태만족국Ⅴ배방표준적항내직분기유차진행료과립물배방특성연구。시험안조N EDC측시순배재전고시험태상진행，분별측량차량재－15℃，－7℃화25℃하적과립물배방。통과대시험결과적연구표명：3개온도하，과립물적수량농도수온도적하강대폭상승，립경분포범위축점변대，균재상동립경하출현봉치；과립물체적농도수립경적증대이증대；수량농도대표면적농도적영향대우체적농도，우기재－15℃하，저충영향경가현저。통과대과립물적순태배방결과적분석발현：3개온도하，과립물적배방주요집중재N EDC순배전200 s ，수량농도수차량적가속이상승，수감속이하강；재－15℃하，재정개N EDC순배적가속공황균출현표면적농도적배방봉치，차봉치지간교위접근。
Particulate emission characteristics of China‐Ⅴ gasoline direct injection passenger car were measured by ELPI .On the test bench of chassis dynamometer ,the particulate emissions at -15 ℃ ,-7 ℃ and 25 ℃ were measured respectively . The results show that the particulate numbers greatly increase with the decrease of temperature and the particle size distribution extends .In addition ,the particulate numbers under three temperatures reach the peak in the same particle size .The volume fraction of particle increases with the increase of particle size .The effect of particulate number on surface fraction is larger than that of volume fraction ,which is more significant at -15 ℃ .Through analyzing the transient particulate emission ,it is found that the exhaust particles mainly discharge during the first 200 s of NEDC and the number concentration increases with vehicle acceleration and decreases with vehicle deceleration .At -15 ℃ ,the surface fraction reaches the peak in acceleration conditions of whole NEDC test cycle and the peaks at three temperatures are fairly close .