Study on real-road nitrogen oxide and carbon dioxide emissions of China-6 heavy-duty diesel vehicles

This paper analyzed the NO_x and CO₂ emissions of HDDV in actual use based on remote-monitored data. First, the validity of remote-monitored data has been demonstrated by aligning and comparing the results of PEMS tests and remote-monitored data and selecting 9 HDDVs for analysis. Then, real-road NO_x and CO₂ emission characteristics in different seasons and mileages were analyzed. The results showed that the NO_x emissions were significantly higher in winter and spring than in other seasons due to the ambient temperatures. Also, the NO_x emissions of the tested vehicles showed a slowly increasing tendency as the vehicle's mileage increased, but they were still within the limitations as the mileage exceeded 420,000 km. Distance-based CO₂ emissions and fuel consumption varied in different seasons due to the uncertainties of various factors including payload, vehicle speed and acceleration, road grade, etc., while work-based CO₂ emissions varied a little. Remote monitoring enables long-term, real-time, and nationwide analysis of heavy-duty vehicular NO_x and CO₂ emissions in real-world applications, assisting a lot in the cleaner production of logistics vehicles.