将277台国六重型车用柴油机分别进行WHSC循环和WHTC循环试验，分析稳态工况和瞬态工况下CO2排放水平分布情况，以及发动机排量和发动机功率对CO2排放水平的影响。基于N2O的生成机理，分析46台国六重型车用柴油机的WHSC循环和WHTC循环试验结果，对比EGR路线和发动机排量对N2O排放水平的影响。根据3台国六重型车用柴油机在不同海拔下的CO2与N2O排放浓度、循环比排放量的差异，分析了高海拔对温室气体排放的影响。研究结果表明：试验样本整体排放水平可作为CO2排放限值和N2O排放限值拟定基准；发动机排量对CO2和N2O限值划分与实际应用有较大影响；CO2排放监管可忽略高海拔因素，而N2O排放监管则需考虑其影响。
The WHSC cycle and WHTC cycle tests were carried out on 277 China Ⅵ heavy-duty diesel engines to analyze the distribution of CO2 emission level under steady-state and transient conditions, as well as the effects of engine displacement and power on CO2 emission level. Based on the formation mechanism of N2O, the WHSC and WHTC cycle test results of 46 China Ⅵ heavy-duty diesel engines were analyzed, and the effects of EGR technology route and engine displacement on N2O emission level were compared. According to the differences of CO2and N2O emission concentrations and cycle specific emissions between different altitudes from 3 China Ⅵ heavy-duty diesel engines, the effect of high altitude on greenhouse gas emission was analyzed. The research results show that the total emission level of test samples can be used as a benchmark for the CO2 and N2O emission limit. The engine displacement has a great influence on the division and practical application of the two limits. The high altitude factor can be ignored for CO2 emission regulation, while its impact should be considered for N2O emission regulation.
