Effect of Ambient Temperature on the Emissions of
Heavy-Duty Diesel Vehicles

doi:10.3969/j.issn.1001-2222.2025.05.003

Vehicle Engine ›› 2025, Vol. 0 ›› Issue (5) : 21. DOI: 10.3969/j.issn.1001-2222.2025.05.003

Effect of Ambient Temperature on the Emissions of Heavy-Duty Diesel Vehicles

GAO Jianbin,ZHOU Zhiyu,HE Guanzhang,ZHU Minlin,LI Juncheng,WANG Xiaohui

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Abstract

Taking a heavy-duty diesel vehicle compliant with China Ⅵ b emission standards as the research subject, the vehicle emission characteristics under different ambient temperatures were researched by introducing a dual-stage SCR system equipped with an electric heating device. Through the synergistic effect of engine thermal management (combustion mode switching) and aftertreatment thermal management (electric heating enablement), the vehicle emission test results in CHTC-HT cycle showed different emissions levels under different ambient temperatures. Compared to cycle-averaged emission results collected at －10 ℃, NH₃ emissions at 10 ℃ and 40 ℃ decreased by 76.74% and 83.97% respectively, and N₂O emissions decreased by 48.71% and 66.94% respectively. Meanwhile, the cycle-averaged NO_x emissions increased by approximately 19% at both temperatures, while PN₁₀ emissions increased to 3.91 times and 10.79 times respectively, and PN₂₃ emissions increased to 5.52 times and 15.05 times respectively.The first 400 seconds of the CHTC-HT test cycle represented the peak period for NO_x and PN₁₀ emissions. The primary cause of PN₁₀ emissions stemmed from particulate matter generated by urea injection and the interaction of condensate with particulate matter. The front to rear urea injection ratio significantly impacted NH₃ and N₂O emissions. At high temperatures, increasing rear urea injection led to the higher NH₃ and N₂O emissions.

Key words

diesel engine / low load / ambient temperature / emission control

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GAO Jianbin, ZHOU Zhiyu, HE Guanzhang, ZHU Minlin, LI Juncheng, WANG Xiaohui. Effect of Ambient Temperature on the Emissions of Heavy-Duty Diesel Vehicles[J]. Vehicle Engine. 2025, 0(5): 21 https://doi.org/10.3969/j.issn.1001-2222.2025.05.003