Real Driving Cold Start Characteristics of Heavy-Duty Vehicles Based on Remote Monitoring

Vehicle Engine ›› 2025, Vol. 0 ›› Issue (4) : 23-28.

REN Shuojin¹,LI Yuehua¹,TONG Chang¹,LI Tengteng^1,2,ZHONG Xianglin¹,YU Quanshun¹

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Abstract

In order to meet the requirements of the future assessment of the China Ⅶ emission standard for heavy-duty vehicles on cold start emissions during real road tests, the cold start characteristics of heavy-duty vehicles under real road driving conditions were investigated, and 16 629.4 h remotely monitored emission data from 36 in-use eight-typed heavy-duty vehicles were analyzed and studied. The results show that for vehicles with the same usage vehicles, the average trip duration and average work increase with the increase of the maximum gross mass. The average cold start duration of all vehicles was 912.4 s, the average proportion of cold start duration was 38.58%, and the World Harmonized Transient Cycle (WHTC) cycle power multiplier of the average cold start work was 0.25. For real driving conditions, the vehicles might run for a long time without being able to complete the warm-up due to the effect of low ambient temperature, frequent start-stop, or long idling speeds. Optimizing cold start emissions for heavy-duty vehicles would be one of the challenges in meeting future emission standard upgrades.

Key words

heavy-duty vehicle

/ real driving / cold start / remote monitoring

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REN Shuojin, LI Yuehua, TONG Chang, LI Tengteng, ZHONG Xianglin, YU Quanshun. Real Driving Cold Start Characteristics of Heavy-Duty Vehicles Based on Remote Monitoring[J]. Vehicle Engine. 2025, 0(4): 23-28