Assessment of different methods in analyzing motor vehicle emission factors

To explore the emission characteristics of vehicle's pollutants is of great significance to prevent and control the diffusion of pollutants. Limited by geographic location and economic condition, the model- and guideline-based studies on vehicle's emission factor have become more concerned measures than the actual measurement. By analyzing the actual operating conditions of motor vehicles, this study obtains the emission factors of typical pollutants from different motor vehicles by adopting international vehicle emission (IVE) model and guideline method, respectively. Furthermore, the resulting emission factors by the above methods were compared and analyzed with on-road method. The results show that: (1) the emission factors of vehicle pollutants change regularly with velocity, emission standard, and accumulated mileage. Taking CO as an example, its emission factor shows a downward trend with the increase of velocity and emission standard and an upward trend with the increase of accumulated mileage; (2) compared with the actual measurement, the vehicle emission factor obtained by the guideline method has a large error, while the IVE model is close to the actual.

Automated summary

Exploring the emission characteristics of vehicle pollutants is crucial for preventing and controlling the spread of pollutants. Due to geographical and economic limitations, model- and guideline-based studies on vehicle emission factors have become more popular than actual measurements. This study analyzed the actual operating conditions of motor vehicles and obtained the emission factors of typical pollutants from different vehicles using the international vehicle emission (IVE) model and guideline method. The resulting emission factors were compared and analyzed with on-road measurements. The study found that the emission factors of vehicle pollutants change regularly with velocity, emission standard, and accumulated mileage. The IVE model was found to be close to the actual measurements, while the guideline method had a larger error.