A Study on Gasoline Engine Combustion by Observation of Intermediate Reactive Products during Combustion

Noguchi, Masaaki; Tanaka, Yukiyasu; Tanaka, Taro; Takeuchi, Yukihisa

doi:10.4271/790840

Cited by 356 publications

(170 citation statements)

References 2 publications

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“…It is now generally agreed that HCCI combustion is dominated by local chemical-kinetic reaction rates [1], with no requirement for flame propagation. This notion has been supported by spectroscopic data indicating that the order of radical formation in HCCI combustion corresponds to selfignition rather than flame propagation [2,3]. Recent analytical developments also support the view that HCCI combustion is dominated by chemical kinetics, and an analysis methodology based on this premise has had considerable success in predicting HCCI combustion and emissions [4].…”

Section: Analysis Of Hcci Combustionmentioning

confidence: 63%

HCCI Combustion: Analysis and Experiments

Aceves¹,

Flowers²,

Martínez-Frías³

et al. 2001

SAE Technical Paper Series

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Homogeneous charge compression ignition (HCCI) is a new combustion technology that may develop as an alternative to diesel engines with high efficiency and low NO x and particulate matter emissions. This paper describes the HCCI research activities being currently pursued at Lawrence Livermore National Laboratory and at the University of California Berkeley. Current activities include analysis as well as experimental work.On analysis, we have developed two powerful tools: a single zone model and a multi-zone model. The single zone model has proven very successful in predicting start of combustion and providing reasonable estimates for peak cylinder pressure, indicated efficiency and NO X emissions. This model is being applied to develop detailed engine performance maps and control strategies, and to analyze the problem of engine startability. The multi-zone model is capable of very accurate predictions of the combustion process, including HC and CO emissions. The multi-zone model has applicability to the optimization of combustion chamber geometry and operating conditions to achieve controlled combustion at high efficiency and low emissions.On experimental work, we have done a thorough evaluation of operating conditions in a 4-cylinder Volkswagen TDI engine. The engine has been operated over a wide range of conditions by adjusting the intake temperature and the fuel flow rate. Satisfactory operation has been obtained over a wide range of operating conditions. Cylinder-to-cylinder variations play an important role in limiting maximum power, and should be controlled to achieve satisfactory performance.

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Section: Analysis Of Hcci Combustionmentioning

confidence: 63%

HCCI Combustion: Analysis and Experiments

Aceves¹,

Flowers²,

Martínez-Frías³

et al. 2001

SAE Technical Paper Series

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“…CAI combustion technology was first applied successfully to two-stroke gasoline engines by Onishi et al [5] and by Noguchi et al [6]. For two-stroke gasoline engines, CAI combustion was found to increase fuel economy, produce extremely low NOx emissions, and reduce unburned hydrocarbon (HC) emissions.…”

Section: Introductionmentioning

confidence: 99%

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

Zhao

Jian

et al. 2002

SAE Technical Paper Series

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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“…It can be seen that the trends of the experimental results 6 According to the manufacture of the pressure transducer, sometimes the measured values for IMEP (pressure) can be affected by a thermal shock. It is worth noting that with the use of LES code (in a combination with the Aurora detail chemical kinetics code ) for the modelling of the exhaust and induction process, the charge properties at IVC can be automatically calculated and used as an input to the Aurora code.…”

Section: MM 50%trg Gasoline Fuel (95ron) and Stoichiometric Equivalmentioning

confidence: 97%

“…The HCCI combustion was initially recognised at the twostroke engines in late 1970's by Onishi et al [1] and Noguchi et al [6]. They observed that the premixed air-fuel mixture ignites simultaneously at many points without obvious flame propagation.…”

Section: Introductionmentioning

confidence: 98%