选取10辆国六b阶段排放标准的不同动力类型轻型汽油车（插电式混合动力和传统单一汽油发动机），在昆明海拔1 914 m的高原轻型整车环境模拟排放实验室开展常温和低温环境下WLTC循环排放测试，研究分析高原环境下轻型汽油车NH3和PN（PN10和PN23）排放特性及影响因素。结果发现，尾气经TWC后NH3排放大幅增加，高原环境下国六b阶段不同类型轻型汽油车排放因子达到21.80~485.10 mg/km，显著高于《大气氨源排放清单编制技术指南》中轻型汽油车氨排放因子26 mg/km。插电式混合动力和传统汽油发动机的轻型汽油车NH3排放主要集中在低速段和中速段，低温环境下NH3排放更高。与PN23排放相比，插电式混合动力汽车和传统动力轻型汽油车PN10排放分别增加21.11%~50.21%和12.00%~38.47%。低温环境下PN10和PN23排放速率峰值分别为6.12×1011个/s和5.28×1011个/s，高出常温环境下相应PN排放速率约2个数量级。
Ten lightduty gasoline vehicles meeting China Ⅵ phase b emission standards with different power types (plugin hybrid and conventional gasoline engine) were selected to carry out WLTC cycle emission tests under normal and low temperature conditions in the lightduty vehicle environmentsimulated emission laboratory at an altitude of 1 914 m in Kunming. The emission characteristics and influencing factors of NH3 and PN (PN10 and PN23) from lightduty gasoline vehicles were studied in plateau environment. The results showed that the NH3 emission of exhaust gas increased significantly after TWC, and the emission factor for different types of China Ⅵ phase b lightduty gasoline vehicles under plateau environment reached 21.80-485.10 mg/km, which was significantly higher than the 26 mg/km NH3 emission factor of lightduty gasoline vehicles as stated in the Technical Guideline for Preparing the Ammonia Emission Inventory. The NH3 emission of light-duty gasoline vehicles with plugin hybrid and conventional gasoline engines is mainly concentrated in the low speed and medium speed segments, and the NH3 emission was higher in low temperature environment. Compared with PN23 emission, PN10 emission of plugin hybrid electric vehicles and conventional power lightduty gasoline vehicles increased by 21.11%50.21% and 12.00%38.47% respectively. At low temperature, the peak emission rates of PN10 and PN23 were 6.12×1011#/s and 5.28×1011#/s, which were about 2 orders of magnitude higher than the corresponding PN emission rates at normal temperature.
