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Analysis of the Characteristics of Real-World Emission Factors and VSP Distributions—A Case Study in Beijing

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  • Weinan He

    (School of Environment, Tsinghua University, Beijing 100084, China
    Beijing Key Laboratory of Transport Energy Conservation and Emission Reduction, Beijing Transport Institute, Beijing 100073, China)

  • Lei Duan

    (School of Environment, Tsinghua University, Beijing 100084, China)

  • Zhuoyuan Zhang

    (Key Laboratory of Transport Industry of Big Data Application Technologies for Comprehensive Transport, Beijing Jiaotong University, Beijing 100044, China)

  • Xu Zhao

    (Beijing Key Laboratory of Transport Energy Conservation and Emission Reduction, Beijing Transport Institute, Beijing 100073, China)

  • Ying Cheng

    (Beijing Key Laboratory of Transport Energy Conservation and Emission Reduction, Beijing Transport Institute, Beijing 100073, China)

Abstract

Vehicle emissions intensity at a given travel speed is well known among the public since travel speed is the key parameter in both the traffic model and the emission model. Yet, several problems still remain in traditional approaches of measuring the emission intensity. To establish accurate and high-resolution emission factors, an established method of emission factors is proposed based on the real-time monitoring operation conditions data, which can reflect the effect of dynamic traffic changes on emissions. The speed-specific vehicle-specific power (VSP) distributions of different months, as well as those in different vehicles in Beijing were developed and compared. Statistical analyses such as Coefficient of Variation (CV) and Root Mean Square Error (RMSE) were used to quantify the differences in the VSP distribution. The results showed the significant correlation between the distribution of VSP, velocity, and operating patterns at time intervals within the annual range. Driving conditions in 2021 are more eco-friendly because of the improvement of digital development and driving habits. Furthermore, research on CO, HC, and NOx emission factor situations in different cycles revealed that the emission factors of NOx and HC are always underestimated in typical operating modes, while sometimes the emissions of CO are overvalued.

Suggested Citation

  • Weinan He & Lei Duan & Zhuoyuan Zhang & Xu Zhao & Ying Cheng, 2022. "Analysis of the Characteristics of Real-World Emission Factors and VSP Distributions—A Case Study in Beijing," Sustainability, MDPI, vol. 14(18), pages 1-14, September.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:18:p:11512-:d:914712
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    References listed on IDEAS

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