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

Identifikátory výsledku

  • Kód výsledku v 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>

  • Nalezeny alternativní kódy

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

  • Výsledek na webu

    <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>

Alternativní jazyky

  • Jazyk výsledku

    angličtina

  • Název v původním jazyce

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

  • Popis výsledku v původním jazyce

    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.

  • Název v anglickém jazyce

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

  • Popis výsledku anglicky

    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.

Klasifikace

  • Druh

    J<sub>imp</sub> - Článek v periodiku v databázi Web of Science

  • CEP obor

  • OECD FORD obor

    10511 - Environmental sciences (social aspects to be 5.7)

Návaznosti výsledku

  • Projekt

  • Návaznosti

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Ostatní

  • Rok uplatnění

    2020

  • Kód důvěrnosti údajů

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

Údaje specifické pro druh výsledku

  • Název periodika

    Science of The Total Environment

  • ISSN

    0048-9697

  • e-ISSN

  • Svazek periodika

    738

  • Číslo periodika v rámci svazku

    139753

  • Stát vydavatele periodika

    NL - Nizozemsko

  • Počet stran výsledku

    9

  • Strana od-do

  • Kód UT WoS článku

    000560045000012

  • EID výsledku v databázi Scopus

    2-s2.0-85086066492