A New Type of Miller Supercharging System for High-Speed Engines - Part 1 Fundamental Considerations and Application to Gasoline Engines

Sakai, Hiroshi; Noguchi, Hiroshi; Kawauchi, Masato; Kanesaka, Hiroshi

doi:10.4271/851522

Cited by 5 publications

(2 citation statements)

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“…In this study, it was also observed that a reflected pressure wave caused further autoignition events. In 1985 Hiroshi Sakai et al [187] of the University of Tokyo published on an experimental supercharged Miller engine where effective EIVC was achieved through the use of a rotary valve in the intake system, together with a conventional poppet valve in the cylinder head. This was almost 40 years after the concept had first been proposed [79].…”

Section: The 1980s: Electronic Ignition Control Computerized Analysis...mentioning

confidence: 99%

Knock: A Century of Research

Corrigan¹,

Fontanesi²

2021

SAE Int. J. Engines

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Knock is one of the main limitations on increasing spark-ignition (SI) engine efficiency. This has been known for at least 100 years, and it is still the case today. Knock occurs when conditions ahead of the flame front in an SI engine result in one or more autoignition events in the end gas. The autoignition reaction rate is typically much higher than that of the flame-front propagation. This may lead to the creation of pressure waves in the combustion chamber and, hence, an undesirable noise that gives knock its name. The resulting increased mechanical and thermal loading on engine components may eventually lead to engine failure. Reducing the compression ratio lowers end-gas temperatures and pressures, reducing end-gas reactivity and, hence, mitigating knock. However, this has a detrimental effect on engine efficiency.Automotive companies must significantly reduce their fleet carbon dioxide (CO 2 ) values in the coming years to meet targets resulting from the 2015 Paris Agreement. One path towards meeting these is through partial or full electrification of the powertrain. However, the vast majority of automobiles in the near future will still feature a gasoline-fueled SI engine; hence, improvements in combustion engine efficiency remain fundamental.As knock has been a key limitation for so long, there is a huge amount of literature on the subject. A number of reviews on knock have already been published, including in recent years. These generally concentrate on current understanding and status. The present work, in contrast, aims to track the progress of research on knock from the 1920s right through to the present day. It is hoped that this can be a useful reference for new and existing researchers of the subject and give further weight to occasionally neglected historical activity, which can still provide important insights today.

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Section: The 1980s: Electronic Ignition Control Computerized Analysis...mentioning

confidence: 99%

Knock: A Century of Research

Corrigan¹,

Fontanesi²

2021

SAE Int. J. Engines

View full text Add to dashboard Cite

show abstract

“…The need for special camshafts and variable valve trains has made many people to search for devices that would enable dynamic IVC variation. Sakai et al [11] employed rotary auxiliary intake valves to a turbocharged Miller cycle engine, showing a BSFC decrease of 10% and 15% power increase by expanding the knock limit. It was demonstrated a remarkable decrease in compression temperatures as well as up to 100 K decrease in exhaust temperatures.…”

Section: Introductionmentioning

confidence: 98%

Full-load Miller cycle with ethanol and EGR: Potential benefits and challenges

Martins

Lanzanova

2015

Applied Thermal Engineering

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Lean-Stratified Combustion System with Miller Cycle for Downsized Boosted Application - Part I

Solomon¹,

Battiston²,

Sczomak³

2021

SAE Int. J. Adv. & Curr. Prac. in Mobility

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<div class="section abstract"><div class="htmlview paragraph">Automotive manufacturers relentlessly explore engine technology combinations to achieve reduced fuel consumption under continued regulatory, societal and economic pressures. For example, technologies enabling advanced combustion modes, increased expansion to effective compression ratio, and reduced parasitics continue to be developed and integrated within conventional and hybrid propulsion strategies across the industry. A high-efficiency gasoline engine capable for use in conventional or hybrid electric vehicle platforms is highly desirable. This paper is the first to two papers describing the development of a combustion system combining lean-stratified combustion with Miller cycle for downsized boosted applications. The work was completed under a multi-year US DOE project. The goal was to define a light-duty engine package capable of achieving a 35% fuel economy improvement at US Tier 3 emission standards over a naturally aspirated stoichiometric baseline vehicle. A multi-mode combustion system was developed enabling highly efficient lean-stratified operation at light-load and stoichiometric Miller-cycle operation at mid- to high-loads. Some of the unique challenges in synergistically combining the two concepts are highlighted in this paper. A central direct-injection four-valve layout was designed with high-tumble ports and a bowl-in-piston capable of stable operation under highly dilute (lean plus EGR) mixtures when properly matched to fuel spray characteristics, a multiple-injection strategy, and a high-energy ignition system. Other challenges specific to meeting exhaust emissions requirements with a high-efficiency engine are also explored in this study. In this Part 1 of the paper, the single-cylinder combustion system design, analysis, and testing is described. Multi-cylinder engine system design, analysis and development is described in Part 2 of the paper [<span class="xref">1</span>].</div></div>

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A New Type of Miller Supercharging System for High-Speed Engines - Part 1 Fundamental Considerations and Application to Gasoline Engines

Cited by 5 publications

References 1 publication

Knock: A Century of Research

Knock: A Century of Research

Full-load Miller cycle with ethanol and EGR: Potential benefits and challenges

Lean-Stratified Combustion System with Miller Cycle for Downsized Boosted Application - Part I

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