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

This paper analyzed the NOx 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 NOx and CO2 emission characteristics in different seasons and mileages were analyzed. The results showed that the NOx emissions were significantly higher in winter and spring than in other seasons due to the ambient temperatures. Also, the NOx 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 NOx and CO2 emissions in realworld applications, assisting a lot in the cleaner production of logistics vehicles.