Evaluation of ammonia emission characteristics and ammonia reduction effect in hybrid electric vehicles
YIN Dai-lin1, LUO Jia-xin1, ZHANG Meng-zhu2, WEN Yi1
1. CATARC Automotive Test Center Tianjin Co., Ltd, Tianjin 300300, China; 2. School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
Abstract：World Light Vehicle Test Cycle (WLTC) and Real Drive Emission (RDE) tests were conducted on hybrid vehicles, and compared the ammonia reduction benefits of hybrid vehicles relative to conventional fuel vehicles. It also analyzed the differences in ammonia emission characteristics obtained from different hybrid technology routes and different battery charge modes. The study found that hybrid technology has a certain effect on reducing ammonia emissions. Under the same fuel consumption, the use of non-plug-in hybrid technology can reduce ammonia emissions by 56.07%, while the use of plug-in hybrid technology can reduce ammonia emissions by 94.43%. The timing of the peak ammonia emissions differs between plug-in hybrid vehicles and non-plug-in hybrid vehicles. In the mode of increasing battery charge, the vehicles need to burn more fuel to charge the battery, resulting in a smaller excess air coefficient and a stronger catalyst reduction environment, which leads to higher ammonia emissions compared to the mode of consuming battery charge.
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