| 李钰怀,张凯,罗亨波,等.汽油发动机稀薄燃烧NOx后处理系统试验研究[J].内燃机工程,2021,42(5):79-85. |
| Experimental study on performance of NOx af-ter-treatment system in lean burn gasoline engine |
| DOI：10.13949/j.cnki.nrjgc.2021.05.011 |
| Key Words:gasoline engine lean burn NOx aftertreatment LNT PSCR |
| Author Name | Affiliation | E-mail | | LI Yuhuai | Research & Development Center, Guangzhou Automobile Group Co., Ltd | liyuhuai@gacrnd.com | | ZHANG Kai | Research & Development Center, Guangzhou Automobile Group Co., Ltd | | | LUO Hengbo | Research Development Center,Guangzhou Automobile Group Co,Ltd | | | LI Xue | Research Development Center,Guangzhou Automobile Group Co,Ltd | | | DU Jiakun | Research Development Center,Guangzhou Automobile Group Co,Ltd | | | CHEN Hong | Research Development Center,Guangzhou Automobile Group Co,Ltd | chenhong@gacrnd.com |
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| Abstract:A 1.5L turbocharged direct injection gasoline engine was used to study the performance of different NOx after-treatment methods in lean burn gasoline engine with different combinations of three-way catalytic (TWC), lean burn NOx trap (LNT), passive selective catalytic reduction (PSCR). 14 operation conditions were selected according to worldwide harmonized light vehicles test cycle（WLTC）. The results show that lean burn can effectively reduce the effective fuel consumption of gasoline engine by 3.1 ~ 10.1% under part load. In lean burn, the proportion of NO in total NOx decreases by 6.9% for every 0.1 increase of lambda. In rich burn, for every 100 × 10-6 increase in NO volume fraction before TWC, NH3 increases by 48 × 10-6. The NO-NH3 conversion rate of TWC ranged from 51% to 74% at lambda 0.95. TWC + LNT + PSCR can effectively improve the lean burn operation time. In lean burn, LNT can promote the oxidation of NO to NO2, increase the ratio of NO2，improve the catalytic efficiency of PSCR. |
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