Research and Development of Controlled Auto-Ignition (CAI) Combustion in a 4-Stroke Multi-Cylinder Gasoline Engine

Jian, Li; Zhao, Hua; Ladommatos, Nicos; Ma, Tom

doi:10.4271/2001-01-3608

Cited by 124 publications

(45 citation statements)

References 14 publications

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“…reported in a previous paper [22], the engine have been shown to be able to operate in the CAI combustion mode for a range of engine speed and load conditions, with significant improvement in fuel economy and large reduction in exhaust emissions of CO and NOx.…”

Section: Figure 1 Schematic Valve Timing and P-v Diagrammentioning

confidence: 79%

“…An UEGO sensor was used to monitor and adjust the air/fuel ratio while the engine was running. A more detailed description of the engine set-up and experimental procedure can be found in our previous paper [22].…”

Section: Table 1 the Engine Specificationmentioning

confidence: 99%

“…Although the engine could be operated with slightly lean or rich mixtures [22], most experiments were carried out at lambda 1. The use of stoichiometric mixture permits the use of a standard three-way catalyst to reduce any exhaust emissions generated from part-load CAI combustion as well as those from high-load SI combustion operation.…”

Section: Table 1 the Engine Specificationmentioning

confidence: 99%

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Performance and Analysis of a 4-Stroke Multi-Cylinder Gasoline Engine with CAI Combustion

Zhao

Jian

et al. 2002

SAE Technical Paper Series

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171

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Controlled Auto-Ignition (CAI) combustion was realised in a production type 4-stroke 4-cylinder gasoline engine without intake charge heating or increasing compression ratio. The CAI engine operation was achieved using substantially standard components modified only in camshafts to restrict the gas exchange processThe engine could be operated with CAI combustion within a range of load (0.5 to 4 bar BMEP) and speed (1000 to 3500 rpm). Significant reductions in both specific fuel consumption and CO emissions were found. The reduction in NOx emission was more than 93% across the whole CAI range. Though unburned hydrocarbons were higher under the CAI engine operation.In order to evaluate the potential of the CAI combustion technology, the European NEDC driving cycle vehicle simulation was carried out for two identical vehicles powered by a SI engine and a CAI/SI hybrid engine, respectively. The simulation results showed only moderate improvement in fuel economy and exhaust emissions because of low utilisation of CAI during the drive cycle.In order to take full advantage of the CAI combustion technology, detailed analyses were carried out on the engine's performance, heat release and combustion characteristics, emissions and the effect of gas exchange processes. These analyses showed that the engine's performance and emissions were mainly affected by the trapped residual fractions and residual temperature. In addition, the backflow was found to affect the combustion and emission as well.

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Section: Figure 1 Schematic Valve Timing and P-v Diagrammentioning

confidence: 79%

Section: Table 1 the Engine Specificationmentioning

confidence: 99%

Section: Table 1 the Engine Specificationmentioning

confidence: 99%

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Performance and Analysis of a 4-Stroke Multi-Cylinder Gasoline Engine with CAI Combustion

Zhao

Jian

et al. 2002

SAE Technical Paper Series

Self Cite

171

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“…Thus, the combustion transition from the first stage to the second stage takes place when the overall heat release rate changes from the slower first-stage flame rate to the faster second-stage rate, and that transition is here measured as the point where the second derivative of the heat release rate is maximized, as shown in Figure 4. PREMIER combustion in a dual-fuel engine is comparable to combining SI and CI combustion, which is being investigated by several researchers [24][25][26]. One disadvantage of these combustion strategies is that they are difficult to control under lean mixture conditions.…”

Section: Concept Of Premier Combustionmentioning

confidence: 99%

Combustion and Exhaust Emission Characteristics of Diesel Micro-Pilot Ignited Dual-Fuel Engine

Azimov¹,

Tomita²,

Kawahara³

2013

Diesel Engine - Combustion, Emissions and Condition Monitoring

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“…In order to face these two challenges, new combustion mode such as CAI (Controlled Auto-ignition) or HCCI (Homogeneous Charge Compression Ignition) can have an important potential, by strongly reducing the NOx emissions and consequently being able to pass emission levels without important post-treatment systems, which often induce a high cost in terms of CO 2 emissions ( [1] to [12]). …”

Section: Introductionmentioning

confidence: 99%

New HCCI/CAI Combustion Process Development: Methodology for Determination of Relevant Fuel Parameters

Jeuland

Montagne²

2006

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Développement des nouveaux procédés de combustion CAI/HCCI : méthodologie de détermination des propriétés critiques du carburant -Atteindre des niveaux d'émissions de polluants de plus en plus faibles tout en limitant les émissions de CO 2 sont les 2 principaux challenges de l'industrie automobile. De nombreuses recherches sont actuellement menées sur les nouveaux modes de combustion tels que la CAI (Controlled Auto-Ignition) pour les moteurs à allumage commandé ou le HCCI (Homogeneous Charge Compression Ignition) pour les moteurs diesel. Ces nouveaux procédés ont en effet le potentiel de réduire d'un facteur de 10 à 100 les émissions de NOx et de particules par rapport à des moteurs à allumage commandé ou diesel « classiques ». La principale difficulté freinant le dévelop-pement de ces nouveaux moteurs reste leur zone de fonctionnement limitée en termes de régime/charge en raison des limitations en émissions de NOx et en bruit. Une des voies les plus prometteuses permettant d'augmenter la zone de fonctionnement CAI réside dans une formulation du carburant optimisée afin d'améliorer l'initiation de la combustion en modifiant et contrôlant les propriétés d'auto-inflammation et/ou les propriétés physiques et chimiques. Afin de sélectionner les carburants, une nouvelle procédure permettant une meilleure caractérisation de l'impact du carburant sur le fonctionnement moteur pour un grand nombre de points de fonctionnement a été mise en place. L'utilisation de cette méthode pour une large gamme de carburants, formulés en fonction de leurs propriétés d'auto-inflammation, leur volatilité et leur composition chimique a permis de souligner la complexité de l'impact carburant et a permis de mettre en avant les principales caractéristiques permettant d'optimiser la formulation de ceux-ci. Abstract

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Research and Development of Controlled Auto-Ignition (CAI) Combustion in a 4-Stroke Multi-Cylinder Gasoline Engine

Cited by 124 publications

References 14 publications

Performance and Analysis of a 4-Stroke Multi-Cylinder Gasoline Engine with CAI Combustion

Performance and Analysis of a 4-Stroke Multi-Cylinder Gasoline Engine with CAI Combustion

Combustion and Exhaust Emission Characteristics of Diesel Micro-Pilot Ignited Dual-Fuel Engine

New HCCI/CAI Combustion Process Development: Methodology for Determination of Relevant Fuel Parameters

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