School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China.
Weichai Power Co. Ltd., Weifang 261061, China.
J Environ Sci (China). 2025 Mar;149:330-341. doi: 10.1016/j.jes.2023.11.018. Epub 2023 Nov 27.
The emission of heavy-duty vehicles has raised great concerns worldwide. The complex working and loading conditions, which may differ a lot from PEMS tests, raised new challenges to the supervision and control of emissions, especially during real-world applications. On-board diagnostics (OBD) technology with data exchange enabled and strengthened the monitoring of emissions from a large number of heavy-duty diesel vehicles. This paper presents an analysis of the OBD data collected from more than 800 city and highway heavy-duty vehicles in China using remote OBD data terminals. Real-world NO and CO emissions of China-6 heavy-duty vehicles have been examined. The results showed that city heavy-duty vehicles had higher NO emission levels, which was mostly due to longer time of low SCR temperatures below 180°C. The application of novel methods based on 3B-MAW also found that heavy-duty diesel vehicles tended to have high NO emissions at idle. Also, little difference had been found in work-based CO emissions, and this may be due to no major difference were found in occupancies of hot running.
重型车辆的排放已经引起了全世界的高度关注。复杂的工作和加载条件，与 PEMS 测试可能有很大不同，给排放的监管和控制带来了新的挑战，特别是在实际应用中。具有数据交换功能的车载诊断 (OBD) 技术加强了对大量重型柴油车排放的监测。本文使用远程 OBD 数据终端，对中国 800 多辆城市和高速公路重型车辆的 OBD 数据进行了分析。对中国 6 号重型车辆的实际 NO 和 CO 排放进行了检验。结果表明，城市重型车辆的 NO 排放水平较高，这主要是由于 SCR 温度低于 180°C 的低温时间较长。基于 3B-MAW 的新型方法的应用还发现，重型柴油车在怠速时的 NO 排放量较高。此外，工作基础上的 CO 排放量差异不大，这可能是由于热运行时的占有率没有明显差异。
