首页|基于PEMS测试的重型柴油非城市车辆冷启动NOx排放特征研究

基于PEMS测试的重型柴油非城市车辆冷启动NOx排放特征研究

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为分析重型柴油非城市车辆在实际道路冷启动氮氧化物(NOx)的排放特征,选取20辆符合国六标准的重型柴油车进行实际道路车载尾气检测(Portable Emission Measurement System,PEMS)排放测试.以冷却液温度达到70℃为界限,区分发动机的冷态和热态,进而对冷启动阶段的排放特征进行分析.试验结果表明:冷启动阶段通常发生在600 s以内,时长占比基本小于8%,然而在这一阶段,NOx的比排放达到了 1593.6 mg/(kW·h)以上,明显高于国六标准的限值690mg/(kW·h).为更真实地反映车辆在实际道路上的排放水平,建议在下一阶段的排放标准中,引入包含冷启动阶段的排放评估方法,以完善整车PEMS排放评价体系.
Research on Cold-Start NOx Emission Characteristics of Heavy-Duty Diesel Non-Urban Vehicles Based on PEMS Testing
To analyze the emission characteristics of NOx during cold-start of heavy-duty diesel non-urban vehicles on actual roads,20 heavy-duty diesel vehicles meeting China Ⅵ standards were selected for on-road emission testing using the Portable Emission Meas-urement System(PEMS).By defining the coolant temperature reaching 70℃ as the boundary,the cold and hot states of the engine were distinguished to analyze the emission characteristics during the cold-start phase.The test results indicated that the cold-start phase typically occurs within 600 seconds,accounting for less than 8%of the total duration.However,during this phase,the specific NOx emissions exceeded 1593.6 mg/(kW·h),significantly higher than China Ⅵ standard limit of 690 mg/(kW·h).To more accurately reflect the actual emission levels of vehicles on the road,it is recommended to introduce an emission assessment method incorpora-ting the cold-start phase in the next phase of emission standards,thus improving the vehicle-level PEMS emission evaluation system.

heavy-duty diesel vehiclesNOx emissionChina Ⅵ emission regulationcold-start

李旭、郭亚辰、吴春玲、刘卫林、白晓鑫

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中汽研汽车检验中心(天津)有限公司,天津,300300

天津大学机械工程学院,天津,300072

重型柴油车 NOx排放 国六排放标准 冷启动

国家重点研发计划课题

2022YFC3701805

2024

内燃机
中国内燃机学会

内燃机

影响因子:0.234
ISSN:1000-6494
年,卷(期):2024.40(2)
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