Zhang Yun-Hua, Lou Di-Ming, Tan Pi-Qiang, Hu Zhi-Yuan
School of Automotive Studies, Tongji University, Shanghai 201804, China.
Huan Jing Ke Xue. 2017 May 8;38(5):1828-1834. doi: 10.13227/j.hjkx.201610188.
Based on the revolving drum test bench, an experimental study was conducted in heavy-duty diesel vehicle at China Stage Ⅲ with and without DOC+CDPF to investigate the effects of DOC+CDPF on the gaseous and particle emission characteristics under C-WTVC driving cycle. The results showed that from city circulation conditions to high way circulation conditions to high-speed circulation conditions, the CO, THC, CO and PM emission factors of the test vehicle without DOC+CDPF decreased while NO and PN emission factors increased, the particle number concentration showed two peaks versus the size of the particles and accumulated particles predominated. After the test vehicle was equipped with DOC+CDPF, the emissions factors decreased and the faster the circulation speed, the greater the decreasing amplitudes of the emissions factors. Throughout the C-WTVC, the decreasing amplitudes of CO, THC, CO, and NO emission factors were 70.36%, 72.73%, 17.00% and 7.76%, the PM and PN emission factors decreased by 93.77% and 98.91% respectively. The particle number concentration still had two peaks versus the size of the particles and the nuclear mode particles predominated. Besides, the size of the accumulated particles peak diminished.
基于转鼓试验台，在中国Ⅲ阶段重型柴油车上开展了有无DOC+CDPF的试验研究，以考察C-WTVC行驶循环下DOC+CDPF对气态和颗粒物排放特性的影响。结果表明，从城市循环工况到高速公路循环工况再到高速循环工况，未配备DOC+CDPF的试验车辆的CO、THC、CO和PM排放因子降低，而NO和PN排放因子增加，颗粒物数量浓度随粒径呈现双峰分布且积聚态颗粒占主导。试验车辆配备DOC+CDPF后，排放因子降低，且循环速度越快，排放因子降低幅度越大。在整个C-WTVC过程中，CO、THC、CO和NO排放因子的降低幅度分别为70.36%、72.73%、17.00%和7.76%，PM和PN排放因子分别降低了93.77%和98.91%。颗粒物数量浓度仍随粒径呈现双峰分布且核模态颗粒占主导。此外，积聚态颗粒峰值粒径减小。
