环境温度对插电式混动RDE排放的影响研究

Research on the Influence of Environmental Temperature on RDE emissions of Plug-in Hybrid Vehicle

随着国家碳中和政策和汽车企业油耗双积分政策的推行,插电式混动汽车在国内乘用车市场的占有量稳步上升。以一辆满足国六排放标准的代表性插电式混动汽车为研究对象,在环境模拟实验室使用全流排放测试系统(CVS)和PEMS串联测试,研究了环境温度对插电式混动汽车RDE排放测试影响。结果表明:PN排放量和符合因子随环境温度的下降而升高;NOx符合因子随环境温度的下降而升高;THC、CO、NH_(3)排放量随环境温度的下降而升高;基于欧七或国七控制不同环境温度下插电式混动汽车RDE排放特点及风险分析,提出了通过进行原排、标定策略优化,加载CGPF,提升后处理催化剂的贵金属用量等思路以确保RDE排放满足法规要求。

With the implementation of the national carbon-neutral policy and the double-integral policy of fuel consumption,the share of plug-in hybrid vehicles in the domestic passenger vehicle market has increased steadily.Taking a representative plug-in hybrid vehicle meeting the national six emission standards as the research object,the full-flow emission test system(CVS) and PEMS series test were used in the environmental simulation laboratory,the influence of ambient temperature on RDE emission measurement of plug-in hybrid vehicle was studied.The results showed that PN emission and coincidence factor increased with the decrease of ambient temperature,NOx coincidence factor increased with the decrease of ambient temperature,THC,CO,NH_(3) emission increased with the decrease of ambient temperature Based on the RDE emission characteristics and risk analysis of plug-in hybrid vehicles under different ambient temperatures controlled by Euro 7 or Euro 7,this paper proposes a new approach to control RDE emission of plug-in hybrid vehicles by optimizing the original emission and calibration strategy,loading CGPF,increasing the amount of noble metal used in the post-treatment catalyst to ensure that the RDE emission meets the regulatory requirements.