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| Titel |
The challenge to NOx emission control for heavy-duty diesel vehicles in China |
| VerfasserIn |
Y. Wu, S. J. Zhang, M. L. Li, Y. S. Ge, J. W. Shu, Y. Zhou, Y. Y. Xu, J. N. Hu, H. Liu, L. X. Fu, K. B. He, J. M. Hao |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 19 ; Nr. 12, no. 19 (2012-10-15), S.9365-9379 |
| Datensatznummer |
250011510
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| Publikation (Nr.) |
 copernicus.org/acp-12-9365-2012.pdf |
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| Zusammenfassung |
| China's new "Twelfth Five-Year Plan" set a target for total NOx
emission reduction of 10% for the period of 2011–2015. Heavy-duty diesel
vehicles (HDDVs) have been considered a major contributor to NOx
emissions in China. Beijing initiated a comprehensive vehicle test program
in 2008. This program included a sub-task for measuring on-road emission
profiles of hundreds of HDDVs using portable emission measurement systems
(PEMS). The major finding is that neither the on-road distance-specific (g km−1)
nor brake-specific (g kWh−1) NOx emission factors for
diesel buses and heavy-duty diesel trucks improved in most cases as emission
standards became more stringent. For example, the average NOx emission
factors for Euro II, Euro III and Euro IV buses are 11.3 ± 3.3 g km−1,
12.5 ± 1.3 g km−1, and 11.8 ± 2.0 g km−1,
respectively. No statistically significant difference in NOx emission
factors was observed between Euro II and III buses. Even for Euro IV buses
equipped with SCR systems, the NOx emission factors are similar
to Euro III buses. The data regarding real-time engine performance of Euro IV buses
suggest the engine certification cycles did not reflect their real-world
operating conditions. These new on-road test results indicate that previous
estimates of total NOx emissions for HDDV fleet may be significantly
underestimated. The new estimate in total NOx emissions for the Beijing
HDDV fleet in 2009 is 37.0 Gg, an increase of 45% compared to the
previous study. Further, we estimate that the total NOx emissions for
the national HDDV fleet in 2009 are approximately 4.0 Tg, higher by 1.0 Tg
(equivalent to 18% of total NOx emissions for vehicle fleet in 2009)
than that estimated in the official report. This would also result in 4%
increase in estimation of national anthropogenic NOx emissions. More
effective control measures (such as promotion of CNG buses and a new in-use
compliance testing program) are urged to secure the goal of total NOx
mitigation for the HDDV fleet in the future. |
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