The Fast Burn with Heavy EGR, New Approach for Low NOx and Improved Fuel Economy

Kuroda, Hiroshi; Nakajima, Yasuo; Sugihara, Kunihiko; Takagi, Yasuo; Muranaka, Shigeo

doi:10.4271/780006

Cited by 68 publications

(24 citation statements)

References 7 publications

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“…Hydrogen addition could also be used to reduce NOx emissions by facilitating use of increased exhaust gas recirculation (EGR) [Kur79]. Onboard production of hydrogen is also attractive for reduction of cold start emissions, as well as for catalyst regeneration and post treatment…”

Section: ) Plasmatron Applications To Spark-ignition Enginementioning

confidence: 99%

Onboard Plasmatron Hydrogen Production for Improved Vehicles

Cohn¹,

Bromberg²,

Hadidi³

2005

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A plasmatron fuel reformer has been developed for onboard hydrogen generation for vehicular applications. These applications include hydrogen addition to spark-ignition internal combustion engines, NOx trap and diesel particulate filter (DPF) regeneration, and emissions reduction from spark ignition internal combustion engines First, a thernial plasniatron fuel reformer was developed. This plasmatron used an electric arc with relatively high power to reform fuels such as gasoline, diesel and biofuels at an oxygen to carbon ratio close to 1. The draw back of this device was that it has a high electric consumption and limited electrode lifetime due to the high temperature electric arc. A second generation plasmatron fuel reformer was developed. It used a low-current high-voltage electric discharge with a completely new electrode contigumtion. This design uses two cylindrical electrodes with a rotating discharge that produced low temperature volumetric cold plasma., The lifetime of the electrodes was no longer an issue and the device was tested on several fuels such as gasoline, diesel, and biofuels at different flow rates and different oxygen to carbon ratios.Hydrogen concentration and yields were measured for both the thermal and non-thermal plasmatron reformers for homogeneous (non-catalytic) and catalytic reforming of several fuels.The technology was licensed to an industrial auto part supplier (ArvinMeritor) and is being implemented for some of the applications listed above. The Plasniatron reformer has been successhlly tested on a bus for NOx trap regeneration.The successful development of the plasmatron reformer and its implementation in commercial applications including transportation will bring several benefits to the nation. These benefits include the reduction of NOx emissions, improving engine efficiency and reducing the nation's oil consumption... 11 I ObjectivesThe objective of this program has been to develop attractive applications of plasmatron fuel reformer technology for onboard applications in internal combustion engine vehicles using diesel, gasoline and biofuels. This included the reduction of NOx and particulate matter emissions from diesel engines using plasmatron reformer generated hydrogen-rich gas, conversion of ethanol and bio-oils into hydrogen rich gas, and the development of new concepts for the use ofplasmatron fuel reformers for enablement of HCCI engines. Approach'The objectives set forth in this program were to be met by:P Optimization of plasmatron fuel reformer configurations, including gas and fuel management, plasma geometry, and reactor chamber variations. P Optimization of catalytic and other materials enhanced plasmatron reforming> Determination of reforming characteristics of ethanol, refiied and unrefined biooils and with commercial grade diesel fuel 3 Development of instrumentation for investigating fast transients when using the plasmatron in a pulsed configuration, as would be the case of NOx trap regeneration P Modeling of plasmatron fuel reformer operation using comp...

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Section: ) Plasmatron Applications To Spark-ignition Enginementioning

confidence: 99%

Onboard Plasmatron Hydrogen Production for Improved Vehicles

Cohn¹,

Bromberg²,

Hadidi³

2005

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“…Bu durum hızlı yanma oranı ile doğrudan ilişkilidir [17]. BA motorda çift buji kullanılmasının sağlamış olduğu diğer avantajlar da şu şekilde özetlenebilir [19][20][21][22][23][24][25][26][27]:…”

Section: Gi̇ri̇ş (Introduction)unclassified

Farkli Buji̇ Sayilari Ve Konumularina Sahi̇p Buji̇ Ateşlemeli̇ Bi̇r Motorda Ateşleme Avansinin Motor Performans Parametreleri̇ Üzeri̇ndeki̇ Etki̇si̇

Altın¹,

Bilgin

2016

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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ÖZETBu çalışmanın amacı, çift bujili buji ateşlemeli (BA) bir motorda ateşleme avansının motor performans parametreleri üzerindeki etkisini incelemektir. Çalışmada sanki-boyutlu termodinamik çevrim modeli kullanılmıştır. Simülasyondaki alev yayılması süreci katı model programı kullanılarak modellenmiştir. Ateşleme avansı başta olmak üzere, ekivalans oranı () ve bujilerin silindir kafasındaki üç farklı konumu çalışmanın inceleme parametrelerini oluşturmaktadır. Elde edilen sonuçlardan, merkezde tek bujiye sahip geometrinin genellikle en iyi motor performans karakteristiklerine sahip olduğu, simetrik çift buji kullanılmasının yanmayı hızlandırması sonucu merkezde tek bujili geometrinin karakteristiklerine yakın değerler verdiği belirlenmiştir. Kenarda tek buji olarak adlandırılan geometri ise buji konumundan dolayı alev yolunun uzaması sonucu en kötü motor performans karakteristikleri vermiştir.Anahtar Kelimler: Çift bujili buji ateşlemeli motor, sanki-boyutlu termodinamik çevrim modeli, motor performansı, ateşleme avansı THE EFFECT OF SPARK ADVANCE ON ENGINE PERFORMANCE CHARACTERISTICS IN A SPARK IGNITION ENGINE HAVING VARIOUS SPARK PLUG NUMBERS AND LOCATIONS ABSTRACTThe aim of this study is to investigate the effect of spark advance on engine performance parameters in a twin spark SI engine. Quasi-dimensional thermodynamic engine cycle model has been used in the study. Flame propagation process in the simulation has been modeled by solid model software. Equivalence ratio (), three various locations of the spark plug(s) on cylinder head, and mainly spark advance has been operating parameters of the study. It has been determined that the geometry having centrally located spark plug(s) gives the best combustion and performance characteristics from the results of the study. Using of twin spark plugs gives closer combustion and performance characteristics due to increasing combustion speed. The mid-radius located single spark geometry gives the worst characteristics since it has the longest flame travelling length.

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“…Furthermore, faster-burning in engines produces a more robust and repeatable combustion pattern that permits operation with substantially large amount of exhaust gas recirculation (EGR), or with very lean mixtures, without impairing engine operation stability. Thus, short combustion duration (faster-burning) in combination with heavy EGR (or very lean mixtures) has a potential to achieve greater emission control in combustion chamber along with some improvement in fuel economy due to the reduced pumping work, reduced gas temperature and reduced heat losses (Kuroda et al, 1978;Scussel et al, 1978). Fasterburning also increases resistance to knock that can allow the fuel economy advantages associated with higher compression ratios to be realized (Mattavi, 1980).…”

Section: Introductionmentioning

confidence: 99%

“…Some of these experimentally investigate the effect of using dual ignition chamber (DIC) (Kuroda et al, 1978;Scussel et al, 1978) as shown in Figure 1 or multipoint ignition (Nakamura et al, 1985;Meyer et al, 1992) on faster combustion, while some others investigate the effects of chamber geometry and/or spark plug location by purely geometric consideration of flame development (Poulos and Heywood, 1983;Bilgin, 1999Bilgin, , 2000, or by multi-zone thermodynamic modelling of combustion including the combustion chemistry (Krieger, 1980;Mattavi et al, 1980;Poulos and Heywood, 1983;Heywood, 1984) for the SI engine having single ignition chamber (SIC). Although, there are some production engines having DIC (Brochure, 2000), i.e.…”

Section: Introductionmentioning

confidence: 99%

“…The second approach to achieve faster-burning aims at increasing the frontal area of the flame (Poulos and Heywood, 1983), and at decreasing flame propagation distance as the flame propagates into the unburned charge. This method requires optimization of the chamber shape and the location of the spark plug and/or the adoption of multipoint ignition (Kuroda et al, 1978).…”

Section: Introductionmentioning

confidence: 99%

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Geometric features of the flame propagation process for an SI engine having dual-ignition system

Bilgin

2002

Int. J. Energy Res.

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SUMMARYFlame front surface area and enflamed volume (the volume enclosed with flame front) is theoretically analysed for a spark-ignition engine, having cylindrical disc-shaped combustion chamber with two spark plugs located axisymmetrically on cylinder head, between cylinder axis and cylinder wall. Spherical flame front assumption is used. A computer code is developed based on purely geometric consideration of the flame development process in combustion chamber, and is used to investigate the effects of variations of spark plugs' locations on geometric features of the flame front. A comparison has also been made with a spark-ignition engine having one spark plug at the same location.

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The Fast Burn with Heavy EGR, New Approach for Low NOx and Improved Fuel Economy

Cited by 68 publications

References 7 publications

Onboard Plasmatron Hydrogen Production for Improved Vehicles

Onboard Plasmatron Hydrogen Production for Improved Vehicles

Farkli Buji̇ Sayilari Ve Konumularina Sahi̇p Buji̇ Ateşlemeli̇ Bi̇r Motorda Ateşleme Avansinin Motor Performans Parametreleri̇ Üzeri̇ndeki̇ Etki̇si̇

Geometric features of the flame propagation process for an SI engine having dual-ignition system

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