Diesel Emission Control: 2001 in Review

Johnson, Timothy V.

doi:10.4271/2002-01-0285

Cited by 52 publications

(11 citation statements)

References 44 publications

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“…Integrated control of exhaust gas recirculation (EGR) and turbocharging has been shown to result in a substantial reduction of NO X emissions [11]. It has been reported that best desorption and reduction of NO X is when the equivalence ratio, Φ=1.15 (λ=0.870) when higher CO levels give shorter desorption times [12]. An addition of a diesel oxidation catalyst (DOC) prior to the trap will improve lean NO X trap (LNT) performance, but will also give rise to an increase in fuel consumption (0.5%).…”

Section: -01-0685mentioning

confidence: 99%

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: -01-0685mentioning

confidence: 99%

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

Alimin¹,

Roberts²,

Benjamin³

2006

SAE Technical Paper Series

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“…Otomotiv endüstrisi, taşıt performansından ödün vermeksizin emisyonları ve fosil yakıt bağımlılığını azaltmaya yönelik önemli araştırmalara odaklanmaktadır [3][4][5][6]. Özellikle günümüzde emisyonları azaltmak için seçici katalitik indirgeme (SCR), dizel oksidasyon katalizörü, katkılı yakıtlar, otomatik stop-start gibi teknolojiler hem motor hem de yakıt ve taşıt teknolojisinde oldukça ilerlemeler kaydedildiği bilinmektedir [3, [7][8][9].…”

Section: Introductionunclassified

Seri̇-Paralel Hi̇bri̇t Elektri̇kli̇ Taşitlardaki̇ Güç Dağitici (Power Split) Mekani̇zmasinin Motor Hizi Deği̇şi̇mi̇ne Bağli İncelenmesi̇

Arabacı

2019

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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Hibrit elektrikli taşıtlarda elektrik motoru ve içten yanmalı motor (İYM) olmak üzere farklı karakteristiklere sahip iki farklı tahrik sistemi bulunmaktadır. Bu iki tahrik sistemi farklı taşıt karakteristiklerine uygun olarak seri, paralel veya seri paralel şekilde düzenlenebilmektedir. Günümüzde yaygın olarak hem seri hem de paralel tahrik sistemlerinin avantajlarını en uygun düzeyde birleştiren seri-paralel tahrik sistemi kullanılmaktadır. Seri paralel tahrik sisteminde elektrik motoru ve İYM'nin güç aktarım stratejisinin düzenlenmesi için güç dağıtıcı (power split) mekanizması kullanılmaktadır. Yapılan bu çalışmada belirli hız aralığında sabit tork elde edilebilen bir İYM'nin güç dağıtıcı mekanizmasına adapte edilmesiyle güç aktarım stratejisinin bu hız aralığına bağlı olarak incelenmesi hedeflenmiştir. Güç dağıtıcı mekanizmasında yörünge/güneş dişli oranı sabit tutulmuştur. Bununla birlikte taşıtın için farklı hız ve güç taleplerinde motojeneratörlerin motor/jeneratör durumları ile batarya sisteminin şarj/deşarj durumları İYM'nin farklı hızları için hesaplanmış ve tartışılmıştır. Sonuç olarak güç dağıtıcı mekanizması için sabit torkta İYM hızının etkileri ve İYM hızını etkileyen parametreler belirlenmiştir.

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“…This, in turn, greatly detracts from the lean NO X catalyst's efficiency and requires a desulfation process to recover some of the lost efficiency. The catalysts never fully regenerate to 100% capacity, thus suggesting that they have a finite life (Johnson, 2002).…”

Section: Lean No X Catalystsmentioning

confidence: 99%

“…As emission regulations become more stringent, especially for NO X and PM emissions, aftertreatment will be the only way to build certifiable engines. There are numerous types of aftertreatment systems including diesel oxidation catalysts, lean NO X catalysts, selective catalytic reduction, exhaust gas recirculation, non-thermal plasma catalysts, and diesel particulate filters (Johnson, 2002). Each system has advantages and disadvantages which must be weighted before selecting an after-treatment system, however their use is inevitable.…”

Section: Exhaust Aftertreatmentmentioning

confidence: 99%

Performance evaluation of diesel particulate filters on heavy-duty vehicles

Rosepiler¹

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Diesel particulate filters, or DPFs, are exhaust aftertreatment devices used to reduce exhaust emissions from diesel powered vehicles. Typical designs have a wall flow filter element downstream of an oxidation catalyst, which oxidizes a portion of the NO present in the exhaust stream to form NO 2. The resulting NO 2 aides in the combustion of the soot collected in the wall flow filter element allowing for the complete breakdown of the soot within typical diesel exhaust temperatures, thus limiting the required maintenance on the filter elements to the removal of non-combustible ash. Three aspects of DPF performance were investigated: cold start performance, filter durability, and general efficiencies. The cold start performance evaluation determined that the filter elements trapped particulate matter prior to the DPF light-off temperature being reached, however there was no significant impact on white smoke emissions at any temperature range. The DPF light-off temperature was determined to be between 330°F and 450°F for the Engelhard DPX and between 375°F and 450°F for the Johnson-Matthey CRT. The filter durability study showed a slight degeneration of DPF performance as age and accumulated mileage increased. However, a definitive DPF life span could not be determined due to inconsistencies in the data from one testing round to the next. In the general efficiencies evaluation, CO emissions were reduced by greater than 84% for both DPF styles tested. HC emissions were reduced by 76% with the Engelhard DPX and by 81% with the Johnson-Matthey CRT. PM emissions were reduced by 94% and 82% by the Engelhard DPX and the Johnson-Matthey CRT respectively. No significant changes were recorded for total NO X (NO + NO2) or CO 2 emissions. Virginia University (WVU), the Washington Metropolitan Area Transit Authority (WMATA), the Westchester County Transit Authority (WCTA), the New York City Department of Sanitation (NYCDOS), and Ralph's Grocery fleet in Riverside, California. Multiple driving schedules were utilized through out this testing. Most driving schedules were cycles or routes developed to simulate the duty cycle of a specific fleet, although some driving schedules were standard cycles, such as the Central Business District (CBD) cycle. Details pertaining to the test vehicles, the driving schedules, and experimental results are given in Chapter 4 of this thesis, Test Vehicles, Driving Schedules, and Results. Conclusions drawn from this data about the performance of diesel particulate filters are shown in Chapter 5-Conclusions.

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Diesel Emission Control: 2001 in Review

Cited by 52 publications

References 44 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

Seri̇-Paralel Hi̇bri̇t Elektri̇kli̇ Taşitlardaki̇ Güç Dağitici (Power Split) Mekani̇zmasinin Motor Hizi Deği̇şi̇mi̇ne Bağli İncelenmesi̇

Performance evaluation of diesel particulate filters on heavy-duty vehicles

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