Studies on Enhanced CVS Technology to Achieve SULEV Certification

Behrendt, Harald; Mörsch, O.; Seiferth, C. T.; Seifert, Greg; Wiebrecht, J. W.

doi:10.4271/2002-01-0048

Cited by 15 publications

(4 citation statements)

References 4 publications

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“…As emissions can be very low on new technology vehicles these systems get inaccurate (see below). Enhanced systems are being developed to overcome this [6,2,7,13]. A detailed study on the (in)accuracy of different systems is given in Sherman et al [14].…”

Section: Validation Of the Voemlow Systemmentioning

confidence: 98%

The realisation of an on-board emission measuring system serving as a R&D tool for ultra low emitting vehicles

Lenaers¹,

Pelkmans²,

Debal³

2003

IJVD

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The negative impact of deteriorating air quality on public health etc. is receiving growing attention. As a result the contributing emission sources are increasingly regulated. Thus, the emissions of road transportbeing one of the largest contributors-are under constant pressure. As such, the evolving legislation on emissions of new cars is forcing to ultra low emitting vehicles. To assist in the development of those vehicles an on-board measuring system capable of determining ppm level emissions of carbon monoxide (CO), total hydrocarbons (THC) and nitrogen oxides (NO x ) is realized. This system combines the latest in laboratory grade analysers with a high speed condensing type sampling system in a stateof-the-art shock proof design. The regulated emission components can be detected to at least one ppm. The data-acquisition allows for the simultaneous retrieval of engine and vehicle parameters in order to calculate on-line mass based time resolved emissions that can be quickly linked to relevant parameters of the emission control system. The data treatment is automated under LabView. The on-board system is validated by over 130 comparative simultaneous measurements on a Constant Volume Sampling chassis dynamometer. The tests are executed on three modern light duty vehicles of which one ultra low emitting Euro 4 certified petrol one. The comparison revealed that differences in emissions are below 10% except for very low levels i.e. underneath 0.02 g/km where the reference system is thought to be more inaccurate then the on-board one. On-board emission measurements performed on a Euro 4 petrol vehicle showed differences of more then a decade when compared to the type approval cycle on chassis dynamometer. An in-depth analysis revealed that outside this cycle the engine can be differently calibrated resulting in deviations from the stoichiometric air to fuel ratio and subsequent raise in emissions. Also, very short emission events could be studied such as NO x raise during accelerations immediately following a motoring period. This could be attributed to a slightly lean air fuel mixture just at the start of fuel injection.

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Section: Validation Of the Voemlow Systemmentioning

confidence: 98%

The realisation of an on-board emission measuring system serving as a R&D tool for ultra low emitting vehicles

Lenaers¹,

Pelkmans²,

Debal³

2003

IJVD

View full text Add to dashboard Cite

show abstract

“…Ciągły rozwój przepisów dotyczących jakości powietrza i emisji związków szkodliwych spalin występujący w ostatnich latach zmusza producentów samochodów do dalszego usprawniania konstrukcji samochodowych układów obniżania emisji [1][2][3]. Z drugiej strony, ponieważ stężenie poszczególnych składników szkodliwych w gazach spalinowych w nowoczesnych samochodach jest coraz mniejsze, niezbędny jest rozwój metod pomiarowych pozwalających na pomiar tej emisji z możliwie małą niepewnością [4][5][6][7][8][9][10][11][12][13][14].…”

Section: Wstępunclassified

Influence of the chassis dynamometer regulation on the exhaust emission results

Szczotka

Puchałka

Bielaczyc

et al. 2019

atest

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Exhaust emission measurements on the chassis dynamometer are one of the most important and most complex tests which are per-formed on vehicles powered by combustion engines. Many factors must be under control during exhaust emission measurements, which have an influence on correctness of the obtained results. In this paper, the impact of the chassis dynamometer regulation on the exhaust emission results is analysed.

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“…As emissions can be very low on new technology vehicles, these systems get inaccurate (see below). Enhanced systems are being developed to overcome this (Guenther et al, 2001(Guenther et al, , 2002Behrendt et al, 2002;Luzenski et al, 2002). A detailed study on the (in)accuracy of different systems is given in Sherman et al, (2001).…”

Section: Validation Of the Voemlow Systemmentioning

confidence: 99%

Mobile Emission Measurements for Assessing Low Emitting Vehicles Exemplified on a CRT-Equipped Bus

Lenaers

Poppel

2005

Inter J Ener Clean Env

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An on-board system capable of determining ppm level emissions of carbon monoxide (CO), total hydrocarbons (THC), and nitrogen oxides (NOx) is developed. The data acquisition allows for the simultaneous retrieval of engine and vehicle parameters to calculate on-line mass based time resolved emissions that can be quickly linked to relevant parameters of the emission control system. The on-board system is validated by 160 comparative measurements on three Constant Volume Sampling (CVS) chassis dynamometers. The tests are executed on a Heavy Duty diesel truck and on three modern Light Duty vehicles. The differences in emissions are generally below 10% until 0.02 g/km. A real life performance evaluation is executed on a Eminox/Johnson Matthey Continuous Regenerating Trap (CRT) equipped VanHool A308 city bus. All tests are performed with, and without, CRT. The CRT reduces, almost eliminating, PM emissions to over 90% CO and THC to over 85%. It is found that the resulting THC ppm concentrations yield mass emissions as low as 0.03 g/km. No significant effect of fuel sulphur content was found in the tests without CRT.

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Studies on Enhanced CVS Technology to Achieve SULEV Certification

Cited by 15 publications

References 4 publications

The realisation of an on-board emission measuring system serving as a R&D tool for ultra low emitting vehicles

The realisation of an on-board emission measuring system serving as a R&D tool for ultra low emitting vehicles

Influence of the chassis dynamometer regulation on the exhaust emission results

Mobile Emission Measurements for Assessing Low Emitting Vehicles Exemplified on a CRT-Equipped Bus

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