Pollutant emissions from vehicles with regenerating after-treatment systems in regulatory and real-world driving cycles

Alvarez, Robert; Weilenmann, Martin; Novak, Philippe

doi:10.1016/j.scitotenv.2008.02.022

Cited by 7 publications

(2 citation statements)

References 10 publications

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“…From Figure 10, it is seen that the greatest NOx emissions rates occur at low average speeds (<20 km/h) with high RPA (>0.4 m/s 2 ). The sub-trips associated to these conditions occurred more than 2000 seconds after the test started, when the LNT aftertreatment system was already operating at its maximum efficiency [26]. The highest NOx emission rate occur in the sub-trip number 37 (3300 seconds after the test started), being consequence of a moderate acceleration at a very low average vehicle speed.…”

Section: Influence Of the Calculation Methods On The Nox Conformity Famentioning

confidence: 99%

An assessment of the real-world driving gaseous emissions from a Euro 6 light-duty diesel vehicle using a portable emissions measurement system (PEMS)

Luján

Bermúdez

Dolz

et al. 2018

Atmospheric Environment

113

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Luján, JM.; Bermúdez, V.; Dolz, V.; Monsalve-Serrano, J. (2018). An assessment of the realworld driving gaseous emissions from a Euro 6 light-duty diesel vehicle using a portable emissions measurement system (PEMS). Atmospheric Environment. 174:112-121. AbstractRecent investigations demonstrated that real-world emissions usually exceed the levels achieved in the laboratory based type approval processes. By means of on-board emissions measurements, it has been shown that nitrogen oxides emitted by diesel engines substantially exceed the limit imposed by the Euro 6 regulation. Thus, with the aim of complementing the worldwide harmonized light vehicles test cycle, the real driving emissions cycle will be introduced after 1 September 2017 to regulate the vehicle emissions in real-world driving situations. This paper presents on-board gaseous emissions measurements from a Euro 6 light-duty diesel vehicle in a real-world driving route using a portable emissions measurement system. The test route characteristics follow the requirements imposed by the RDE regulation. The analysis of the raw emissions results suggests that the greatest amount of nitrogen oxides and nitrogen dioxide are emitted during the urban section of the test route, confirming that lower speeds with more accelerations and decelerations lead to higher nitrogen oxides emissions levels than constant high speeds. Moreover, the comparison of the two calculation methods proposed by the real driving emissions regulation has revealed emissions rates differences ranging from 10% to 45% depending on the pollutant emission and the trip section considered (urban or total). Thus, the nitrogen oxides emissions conformity factor slightly varies from one method to the other.

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Section: Influence Of the Calculation Methods On The Nox Conformity Famentioning

confidence: 99%

An assessment of the real-world driving gaseous emissions from a Euro 6 light-duty diesel vehicle using a portable emissions measurement system (PEMS)

Luján

Bermúdez

Dolz

et al. 2018

Atmospheric Environment

113

View full text Add to dashboard Cite

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“…Diesel Particulate Filter (DPF) has proved to be the most efficient device for particulate reduction at the compression ignition vehicle exhaust. The filtration efficiency of a catalyzed DPF is about 99% [5] [6], but extraemissions during regeneration mode could affect the emission factors of vehicles equipped with DPF [7].…”

Section: Introductionmentioning

confidence: 99%

Gaseous and Particulate Exhaust Emissions of Hybrid and Conventional Cars over Legislative and Real Driving Cycles

Costagliola¹,

Prati

Mariani³

et al. 2015

EPE

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Road transport exhaust emissions represent the main sources of atmospheric pollution in urban areas, due to the growing number of circulating vehicles and travelled distances. In order to reduce this pollution source, stricter emission standards are periodically set by governments throughout the world. Consequently, the concentrations of gaseous pollutants and particulate mass to be measured during type-approval tests of new vehicles are becoming progressively lower; moreover from 2011, diesel cars have to comply with particle number limit. In order to assess emission levels of different technology vehicles and investigate the use of a particulate number measurement technique at the exhaust of very low-emitting vehicles, an experimental activity was carried out on three in-use vehicles: a diesel car equipped with a particulate trap (DPF), a hybrid gasoline-electric car and a bi-fuel passenger car fuelled with compressed natural gas (CNG). Cold and hot gaseous and particulate emission factors and fuel consumption were measured during the execution of real and regulatory driving cycles on a chassis dynamometer. Particulate was characterized in terms of mass only for the diesel car and of particle number for all vehicles. The emissions measured over the NEDC show that all three vehicles comply with their standard limits, except CO for CNG passenger car and NOx for diesel car. Cold start influences CO and HC emissions and fuel consumption for all the tested vehicles and in particular for the hybrid car. The real driving cycle is the most critical pattern for the emissions of almost all pollutants. During constant speed tests, the emissions of particles of hybrid car are an order of magnitude lower than those of the CNG car.

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High-capacity NO2 denuder systems operated at various temperatures (298–473 K)

Wolf

2012

Anal Bioanal Chem

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In this study, we investigated several coatings for high-temperature, high-capacity, and high-efficiency denuder-based NO(2) removal, with the scope to face the harsh conditions and requirements of automotive exhaust gas sampling. As first coating, we propose a potassium iodide (KI)/polyethylene glycol coating with a high removal efficiency (ε > 98%) for about 2 h and 50 ppm NO(2) at room temperature (298 K). At elevated temperatures (423 K), the initial capacity (100 ppmh) is decreased to 15 ppmh. Furthermore, this is the first proposal of the ionic liquid methyl-butyl-imidazolium iodide ([BMIm(+)][I(-)]) as denuder coating material. At room temperature, this ionic liquid exhibits far greater capacity (300 ppmh) and NO(2) removal efficiency (ε > 99.9%) than KI. Nevertheless, KI exhibits a slightly (~10%) higher capacity at elevated temperatures than [BMIm(+)][I(-)]. Both coatings presented are suitable for applications requiring selective denuding of NO(2) at temperatures up to 423 K.

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Pollutant emissions from vehicles with regenerating after-treatment systems in regulatory and real-world driving cycles

Cited by 7 publications

References 10 publications

An assessment of the real-world driving gaseous emissions from a Euro 6 light-duty diesel vehicle using a portable emissions measurement system (PEMS)

An assessment of the real-world driving gaseous emissions from a Euro 6 light-duty diesel vehicle using a portable emissions measurement system (PEMS)

Gaseous and Particulate Exhaust Emissions of Hybrid and Conventional Cars over Legislative and Real Driving Cycles

High-capacity NO2 denuder systems operated at various temperatures (298–473 K)

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