Abstract: Taking a China VI heavy-duty diesel vehicle as the research object, the constant velocity and adapted China world transient vehicle cycle (C-WTVC) are performed on the chassis dynamometer, and the NH3 and NOx emissions in the exhaust are detected by portable emission measurement system (PEMS) equipment and fourier transform infrared spectroscopy (FTIR) equipment. The results show that under constant speed conditions, the peak NH3 emission concentration at each speed point appears as the speed increase. The average NH3 emission concentration first decreases and then increases as the speed increases. The average NOx emission concentration increases with the speed increase first, then decrease and then increase. Under C-WTVC, the average NH3 emission concentration is the largest in the high-speed phase, and the average NH3 emission concentration in the urban phase is the smallest. The average NOx emission concentration is low in three phases. The emission factor of NH3 has the same trend as its average emission concentration.

Key words: Heavy duty diesel vehicles; Chassis dynamometer; NH3 emission characteristics

摘要： 以一辆国六重型柴油车为研究对象，在底盘测功机上进行等速和调整的国家对世界重 型商用车辆瞬态循环（C-WTVC）工况，通过便携式排放测试系统（PEMS）和傅氏转换红外 线光谱分析仪（FTIR）设备检测尾气中的 NH3 和 NOx 排放。结果表明，等速工况下，每个 速度点的 NH3 排放浓度峰值出现在提速后的阶段，各速度点的平均 NH3 排放浓度是随速度增 加先减小后增大，平均 NOx 排放浓度随速度先增大后减小再增大；C-WTVC 工况下，高速阶 段的 NH3 平均排放浓度最大，市区阶段 NH3 平均排放浓度最小；NOx 的平均排放浓度在市区、 市郊和高速阶段均较低；NH3 排放因子与其平均排放浓度有相同的趋势。

关键词: 重型柴油车；底盘测功机；NH3 排放特征