On-road detection of trucks with high NOx emissions from a patrol vehicle with on-board FTIR analyzer

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46747885%3A24210%2F20%3A00007774" target="_blank" >RIV/46747885:24210/20:00007774 - isvavai.cz</a>

Alternative codes found

RIV/60460709:41310/20:82005 RIV/68407700:21220/20:00342004

Result on the web

<a href="https://www.sciencedirect.com/science/article/abs/pii/S0048969720332733" target="_blank" >https://www.sciencedirect.com/science/article/abs/pii/S0048969720332733</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.scitotenv.2020.139753" target="_blank" >10.1016/j.scitotenv.2020.139753</a>

Result language

angličtina

Original language name

On-road detection of trucks with high NOx emissions from a patrol vehicle with on-board FTIR analyzer

Original language description

Technological advances in heavy-duty vehicle engines, allowing them to reach NOx emissions comparable to European diesel passenger cars per km driven, are being compromised by aftermarket defeat devices such as selective catalytic reduction (SCR) emulators, many of which can be quickly deactivated by the driver. In a pilot study, the prevalence of trucks with excess NOx emissions on Czech motorways was evaluated using an ordinary Customs Administration patrol vehicle temporarily fitted with a portable fast-response Fourier Transform Infra Red (FTIR) analyzer, acting as an impromptu chase vehicle. The Euro emissions category of the truck was provided from the motorway toll collection transponders. A total of 222 unique trucks were measured during a one-week pilot project. Of these, 66% were Euro VI, 25% were Euro V, and 9% were older categories. NO/CO2 ratios were calculated as a ratio of numerical integrals of the peaks of measured concentrations, as a ratio of maximum measured concentrations, and by linear regression, with the regression approach yielding most realistic results and mean calculated error of 0.2 g/kWh NO. At assumed 85% NO in NOx and 634 g/kWh mean CO2 emissions, the mean emissions of the cleanest 83% of Euro V and cleanest 63% of Euro VI trucks were within the corresponding NOx limit (2 g/kWh for Euro V, 0.46 g/kWh for Euro VI) multiplied by a factor of 1.5. Providing for some allowance for legitimate occurrences of high NOx emissions, about 10-15% of Euro V and about 10-25% of Euro VI trucks are believed to be excess emitters, with no SCR functionality on about 10-15% of Euro VI trucks. The portable FTIR, temporarily mounted on a law enforcement vehicle, can be readily used as a screening tool, identifying vehicles to be stopped for additional inspection, but also during roadside emissions inspections.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10511 - Environmental sciences (social aspects to be 5.7)

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Science of The Total Environment

ISSN

0048-9697

e-ISSN

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Volume of the periodical

738

Issue of the periodical within the volume

139753

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

9

Pages from-to

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UT code for WoS article

000560045000012

EID of the result in the Scopus database

2-s2.0-85086066492