Formation of Engine Internal NO2: Measures to Control the NO2/NOX Ratio for Enhanced Exhaust After Treatment

Rößler, Michael; Velji, Amin; Janzer, Corina; Koch, Thomas; Olzmann, Matthias

doi:10.4271/2017-01-1017

Cited by 22 publications

(19 citation statements)

References 20 publications

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“…It may be that at high levels of engine-out NO 2 , the associated levels of passive DPF regeneration would extend the intervals between active regenerations. Given that Hilliard and Wheeler 9 report NO 2 levels up to 30% and Ro¨ßler et al 15 Figure 1. 21 A number of features can be seen here; for example, NO x production is stopped during fuel shut-offs during decelerations associated with gear changes, and the measurements fall to zero at these times.…”

Section: Introductionmentioning

confidence: 88%

“…Modelling NO 2 levels as part of total NO x in computational fluid dynamics (CFD) usually results in high levels of simulation tuning -often using fixed NO:NO 2 ratios obtained from experiments. 13,14 The effect that a number of diesel engine parameters has on the NO 2 /NO x ratio has been investigated in comprehensive work by Ro¨ßler et al 15 conducted on a single-cylinder engine representative of a Euro VI commercial vehicle engine. In general, they found that parameters which decrease NO x emissions lead to increases in NO 2 /NO x ratio.…”

Section: Introductionmentioning

confidence: 99%

“…In general, they found that parameters which decrease NO x emissions lead to increases in NO 2 /NO x ratio. Table 1 shows the effect of common diesel engine parameters on NO 2 /NO x ratio according to Ro¨ßler et al 15 in ascending order of importance.…”

Section: Introductionmentioning

confidence: 99%

“…It is clear that NO 2 /NO x ratios can vary widely and very rapidly over the engine operating range, but the cause of these variations is not completely understood. The recent comprehensive work by Ro¨ßler et al 15 was undertaken on a medium-duty engine and all at steady state. There is therefore a clear need to investigate transient engine-out NO 2 /NO x ratios from a light duty diesel engine, and this has been undertaken in this work.…”

Section: Introductionmentioning

confidence: 99%

“…Effect of common diesel engine parameters on NO 2 /NO x ratio. 15 Parameter NO x emission NO 2 /NO x ratio Humidity " # " Inlet air temperature " # " EGR rate " # " Fuel pressure " # " SOI " # " l"…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Cyclic NO₂:NO_x ratio from a diesel engine undergoing transient load steps

Leach

Davy

Peckham

2019

International Journal of Engine Research

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As the control of real driving emissions continues to increase in importance, the importance of understanding emission formation mechanisms during engine transients similarly increases. Knowledge of the NO2/NOx ratio emitted from a diesel engine is necessary, particularly for ensuring optimum performance of NOx aftertreatment systems. In this work, cycle-to-cycle NO and NOx emissions have been measured using a Cambustion CLD500, and the cyclic NO2/NOx ratio calculated as a high-speed light-duty diesel engine undergoes transient steps in load, while all other engine parameters are held constant across a wide range of operating conditions with and without exhaust gas recirculation. The results show that changes in NO and NOx, and hence NO2/NOx ratio, are instantaneous upon a step change in engine load. NO2/NOx ratios have been observed in line with previously reported results, although at the lightest engine loads and at high levels of exhaust gas recirculation, higher levels of NO2 than have been previously reported in the literature are observed.

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Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Cyclic NO₂:NO_x ratio from a diesel engine undergoing transient load steps

Leach

Davy

Peckham

2019

International Journal of Engine Research

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Light-off Investigation of Oxymethylene Ether (OME) Considering the Presence of the Exhaust Components Heptane, Carbon, and Nitrogen Monoxide

Rümmele

Susdorf

Haider

et al. 2021

Emiss. Control Sci. Technol.

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Synthetic fuels and fuel blends like OMEs can contribute to tank-to-wheel CO2 emission savings. At the same time, it is known that these fuels have a lower exhaust temperature compared to conventional diesel. This effect has major impact on the exhaust after-treatment system, particularly in cold start conditions. This paper investigates the light-off behavior of exhaust gases containing OMEs by temperature-programmed oxidation experiments using a state-of-the-art oxidation catalyst. The main side product of catalytic oxidation of OMEs between 100 °C and the oxidation temperature T50, which was around 160 °C, was shown to be formaldehyde. While alkane oxidation, in this case heptane, was little influenced by OME oxidation, the oxidation temperature T50 of CO increases by more than 10 °C by OME addition. Nitrogen monoxide impeded the oxidation of OME in a similar way to the other components investigated. Due to the amount of FA produced and its toxicity, it could be concluded that it is necessary to heat up exhaust after-treatment systems of OME diesel engines even faster than conventional diesel exhaust after-treatment systems. The relatively high reactivity of OME on oxidation catalyst can be used by active thermal management approaches.

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Assessment of a complete truck operating under dual-mode dual-fuel combustion in real life applications: Performance and emissions analysis

et al. 2020

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Formation of Engine Internal NO₂: Measures to Control the NO₂/NO_X Ratio for Enhanced Exhaust After Treatment

Cited by 22 publications

References 20 publications

Cyclic NO₂:NO_x ratio from a diesel engine undergoing transient load steps

Cyclic NO₂:NO_x ratio from a diesel engine undergoing transient load steps

Light-off Investigation of Oxymethylene Ether (OME) Considering the Presence of the Exhaust Components Heptane, Carbon, and Nitrogen Monoxide

Assessment of a complete truck operating under dual-mode dual-fuel combustion in real life applications: Performance and emissions analysis

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Formation of Engine Internal NO2: Measures to Control the NO2/NOX Ratio for Enhanced Exhaust After Treatment

Cited by 22 publications

References 20 publications

Cyclic NO2:NOx ratio from a diesel engine undergoing transient load steps

Cyclic NO2:NOx ratio from a diesel engine undergoing transient load steps

Light-off Investigation of Oxymethylene Ether (OME) Considering the Presence of the Exhaust Components Heptane, Carbon, and Nitrogen Monoxide

Assessment of a complete truck operating under dual-mode dual-fuel combustion in real life applications: Performance and emissions analysis

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Product

Resources

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Formation of Engine Internal NO₂: Measures to Control the NO₂/NO_X Ratio for Enhanced Exhaust After Treatment

Cyclic NO₂:NO_x ratio from a diesel engine undergoing transient load steps

Cyclic NO₂:NO_x ratio from a diesel engine undergoing transient load steps