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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  07 Sep 2020

07 Sep 2020

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This preprint is currently under review for the journal AMT.

Real-world measurement and mechanical-analysis-based-verification of NOx and CO2 emissions from in-use heavy-duty vehicle

Hiroo Hata1, Kazuo Kokuryo2, Takehiko Ogata2, Masahiko Kugata1, Koichi Yanai1, Megumi Okada1, Chikage Funakubo1, Minoru Yamazaki1, and Junya Hoshi1 Hiroo Hata et al.
  • 1Tokyo Metropolitan Research Institute for Environmental Protection 1-7-5, Sinsuna, Koto-ku, Tokyo 136-0075, Japan
  • 2Modern Planning Inc. 5-49-10 Chuo, Nakano-ku, Tokyo 164-0011, Japan

Abstract. A portable emission measurement system (PEMS) was used to measure the real-world driving emissions pertaining to a Japanese middle-sized heavy-duty vehicle. The testing was performed with the vehicle being driven in the metropolitan area of Tokyo in four seasons (January, June, August, and November) to analyze the seasonal dependence of NOx and CO2 emissioans. The experimental results indicated that the amount of NOx emissions was particularly high in the cold season, owing to the slow starting of the NOx detoxification systems, that is, the exhaust gas recirculation and urea-selective-catalytic-reduction systems, under low ambient temperature conditions. In the real-world driving, a high acceleration pattern was observed in the low-speed region, which is not considered in the world harmonized vehicle cycle, which is the worldwide official driving mode in the chassis dynamometer experiment. Finally, the transient emission tables for NOx and CO2 were constructed based on the PEMS measurement results and the classical mechanic theory. The constructed tables well replicated the experimental results in all the considered conditions involving different ambient temperatures and locations. The proposed approach can be used to evaluate emission inventories in the future.

Hiroo Hata et al.

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Hiroo Hata et al.


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Short summary
The authors conducted the measurement of real-world CO2 and NOx emissions from one heavy-duty vehicle. The results showed that NOx emission increased in the cold season because of the deactivation of the detoxification catalysis. We proposed an analytical model of vehicle emission based on the classical mechanic method. The model well explained the emission behavior of CO2 and NOx, and we concluded that the new model have the potential to evaluate the emission inventory from heavy-duty vehicles.
The authors conducted the measurement of real-world CO2 and NOx emissions from one heavy-duty...