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| Titel |
Tecnical Note: Analysis of non-regulated vehicular emissions by extractive FTIR spectrometry: tests on a hybrid car in Mexico City |
| VerfasserIn |
F. Reyes, M. Grutter, A. Jazcilevich, R. González-Oropeza |
| 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 ; 6, no. 12 ; Nr. 6, no. 12 (2006-11-27), S.5339-5346 |
| Datensatznummer |
250004189
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| Publikation (Nr.) |
 copernicus.org/acp-6-5339-2006.pdf |
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| Zusammenfassung |
| A methodology to acquire valuable information on the chemical composition
and evolution of vehicular emissions is presented. The analysis of the gases
is performed by passing a constant flow of a sample gas from the tail-pipe
into a 10 L multi-pass cell. The absorption spectra within the cell are
obtained using an FTIR spectrometer at 0.5 cm−1 resolution along a 13.1 m
optical path. Additionally, the total flow from the exhaust is
continuously measured from a differential pressure sensor on a \textit{Pitot}
tube installed at the exit of the exhaust. This configuration aims to obtain
a good speciation capability by coadding spectra during 30 s and reporting
the emission (in g/km) of both criteria and non-regulated pollutants, such as
CO2, CO, NO, SO2, NH3, HCHO and some NMHC, during predetermined
driving cycles. The advantages and disadvantages of increasing the
measurement frequency, as well as the effect of other parameters such as
spectral resolution, cell volume and flow rate, are discussed. To test
and evaluate the proposed technique, experiments were performed
on a dynamometer running FTP-75 and typical driving cycles for the Mexico
City Metropolitan Area (MCMA) on a Toyota Prius hybrid vehicle. This car is
an example of recent marketed automotive technology dedicated to
reduced emissions, increasing the need for sensitive detection
techniques. This study shows the potential of the proposed technique to
measure and report in real time the emissions of a large variety of
pollutants, even from a super ultra-low emission vehicle (SULEV). The
emissions of HC's, NOx, CO and CO2 obtained here were compared to
experiments performed in other locations with the same model vehicle. The proposed
technique provides a tool for future studies comparing in detail the emissions
of vehicles using alternative fuels and emission control systems. |
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