On-road comparison of a portable emission measurement system with a mobile reference laboratory for a heavy-duty diesel vehicle
On-road comparisons were made between a mobile emissions laboratory (MEL) meeting federal standards and a portable emissions measurement system (PEMS). These comparisons were made over different conditions; including road grade, vibration, altitude, electric fields, and humidity with the PEMS mounte...
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Veröffentlicht in: | Atmospheric environment (1994) 2009-06, Vol.43 (18), p.2877-2883 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | On-road comparisons were made between a mobile emissions laboratory (MEL) meeting federal standards and a portable emissions measurement system (PEMS). These comparisons were made over different conditions; including road grade, vibration, altitude, electric fields, and humidity with the PEMS mounted inside and outside of the tractor's cab. Brake-specific emissions were calculated to explore error differences between the MEL and PEMS during the Not-To-Exceed (NTE) engine operating zone. The PEMS brake-specific NOx (bsNOx) NTE emissions were biased high relative to the MEL and, in general, were about 8% of the 2007 in-use NTE NO
x
standard of 2.68 g kW
−1 h
−1 (2.0 g hp
−1 h
−1). The bsCO
2 emissions for the PEMS were also consistently biased high relative to the MEL, with an average deviation of +4% ± 2%. NMHC and CO emissions were very low and typically less than 1% of the NTE threshold. This research was part of a comprehensive program to determine the “allowance” when PEMS are used for in-use compliance testing of heavy-duty diesel vehicles (HDDVs). |
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ISSN: | 1352-2310 1873-2844 |
DOI: | 10.1016/j.atmosenv.2009.03.019 |