Study of Factors Influencing the Performance of a NOx Trap in a Light-Duty Diesel Vehicle

Li, Yuejin; Roth, Stan; Yassine, Mahmoud K.; Beutel, T.; Dettling, Joe; Sammer, Chris

doi:10.4271/2000-01-2911

Cited by 11 publications

(6 citation statements)

References 7 publications

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“…Previous studies have also identified the presence of NO X slip during regeneration [10,21]. However, the NO X spikes detected in this study during the rich duration are more well-defined.…”

Section: Performance Of the Lnt During Storage And Regeneration Eventscontrasting

confidence: 51%

“…However, the NO X spikes detected in this study during the rich duration are more well-defined. The study from Li et al [10] shows NO X slip only as a single peak. In the current study, the use of fast response analysers has made it possible to detect the occurrence of two distinct NO X spikes.…”

Section: Performance Of the Lnt During Storage And Regeneration Eventsmentioning

confidence: 97%

“…storage and regeneration process. The ratio between lean and rich period is also influential and typical ranges are between 50-60s lean followed by 1-4s operation under rich conditions [9,10] An effective NO X trap system demands optimisation of key engine operating parameters as part of the reduction process as insufficient reductants in the rich pulse will not completely reduce NO X levels. Integrated control of exhaust gas recirculation (EGR) and turbocharging has been shown to result in a substantial reduction of NO X emissions [11].…”

Section: -01-0685mentioning

confidence: 99%

“…Li et al [10] suggested that the occurrence of NO X slip could be due to any of or a combination of factors: the long trapping duration, insufficient rich duration, the lambda value at LNT inlet being greater than 1, the LNT nearing its saturation point or the LNT bed temperature being either too high or too low. NO X spikes observed in this study are probably due to insufficient reductant, as low CO levels are observed downstream of the LNT during the time when the first NO X spike is observed.…”

Section: Performance Of the Lnt During Storage And Regeneration Eventsmentioning

confidence: 99%

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A NOX Trap Study Using Fast Response Emission Analysers for Model Validation

Alimin¹,

Roberts²,

Benjamin³

2006

SAE Technical Paper Series

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Lean burn after treatment systems using NO X traps for reducing emissions from diesel exhausts require periodic regeneration after each storage stage. Optimising these events is a challenging problem and a model capable of simulating these processes would be highly desirable. This study describes an experimental investigation, which has been designed for the purpose of validating a NO X trapping and regenerating model. A commercial computational fluid dynamics (CFD) package is used, to model NO X trapping and regeneration, using the porous medium approach. This approach has proved successful for three way catalysis modelling. To validate the model a one-dimensional NOx trap system has been tested on a turbocharged, EGR cooled, direct injection diesel engine controlled with an engine management system via DSPACE. Fast response emission analysers have been used to provide high resolution data across the after-treatment system for model validation. Measurements show CO is the primary reductant. After the trap NO and NO 2 spikes (NO X slippage) were observed both at the beginning and end of the regeneration period. The former is believed to be due to insufficient reductant. Whilst the model can qualitatively describe the main storage and regeneration phases it failed to predict NO X slippage.

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Section: Performance Of the Lnt During Storage And Regeneration Eventscontrasting

confidence: 51%

Section: Performance Of the Lnt During Storage And Regeneration Eventsmentioning

confidence: 97%

Section: -01-0685mentioning

confidence: 99%

Section: Performance Of the Lnt During Storage And Regeneration Eventsmentioning

confidence: 99%

See 2 more Smart Citations

A NOX Trap Study Using Fast Response Emission Analysers for Model Validation

Alimin¹,

Roberts²,

Benjamin³

2006

SAE Technical Paper Series

View full text Add to dashboard Cite

show abstract

“…LNT behaviour has been studied in laboratory reactors using synthetic gases [2][3][4][5][6][7][8][9][10][11][12][13][14], on engine test beds [9,[15][16][17][18][19][20][21][22], and on vehicle drive cycle facilities [8,21,22]. Several research groups have developed mathematical models to describe LNT performance [3,16,19,[21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Lean NO_x trap study on a light-duty diesel engine using fast-response emission analysers

Alimin

Benjamin

Roberts

2009

International Journal of Engine Research

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Storage and regeneration events have been studied using fast-response emission analysers (,10 ms) for a lean NO x trap (LNT) fitted to a light-duty diesel engine. Tests were conducted at both low and high exhaust temperatures for various storage and purging periods. The use of fast-response analysers has provided detailed information during the short regeneration periods and as combustion switched between rich and lean operating modes. It has also enabled quantification of the storage, reduction, and overall conversion efficiencies, as well as the instantaneous trapping efficiency. With exhaust temperatures of 250 uC, storage efficiency was low (,30 per cent). During purging, two distinct NO spikes (breakthroughs) were measured downstream of the LNT at the beginning and end of regeneration. For this LNT, the primary reducing mechanism is CO reacting with NO, but CO reacting with ceria and/or water, the water-gas shift reaction, is suspected. With exhaust temperatures of 400 uC, storage efficiencies were high (,80-90 per cent), except for the long-storage/short-purge case when the trap was near saturation. NO x breakthrough during enrichment depended on storage and purge periods and the availability of catalyst sites. NO 2 breakthrough was also observed at the end of regeneration as the combustion switched to lean operation. Generally, for the hightemperature case on this LNT, the primary reducing mechanism is CO reacting with NO 2 .

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The Study on the Capacity of NOx Storage-Reduction Catalyst for Lean-Burn Engine

Wang

Liu

et al. 2012

Lecture Notes in Electrical Engineering

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Study of Factors Influencing the Performance of a NOx Trap in a Light-Duty Diesel Vehicle

Cited by 11 publications

References 7 publications

A NOX Trap Study Using Fast Response Emission Analysers for Model Validation

A NOX Trap Study Using Fast Response Emission Analysers for Model Validation

Lean NO_x trap study on a light-duty diesel engine using fast-response emission analysers

The Study on the Capacity of NOx Storage-Reduction Catalyst for Lean-Burn Engine

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Study of Factors Influencing the Performance of a NOx Trap in a Light-Duty Diesel Vehicle

Cited by 11 publications

References 7 publications

A NOX Trap Study Using Fast Response Emission Analysers for Model Validation

A NOX Trap Study Using Fast Response Emission Analysers for Model Validation

Lean NOx trap study on a light-duty diesel engine using fast-response emission analysers

The Study on the Capacity of NOx Storage-Reduction Catalyst for Lean-Burn Engine

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Product

Resources

About

Lean NO_x trap study on a light-duty diesel engine using fast-response emission analysers