New Combustion and Powertrain Control Technologies for Fun-to-Drive Dynamic Performance and Better Fuel Economy

Itabashi, Shigeru; Murase, Eiji; Tanaka, Hiroya; Yamaguchi, Masatoshi; Muraguchi, T

doi:10.4271/2017-01-0589

Cited by 15 publications

(8 citation statements)

References 4 publications

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“…Tumble efficiency was defined as energy transformed into generating tumble normalized by extra pumping work due to intake flow restriction. Stroke-to-bore ratio is also a key design decision to be made when designing a new engine and was shown to be a trade-off by Itabashi et al [303] of Toyota in 2017. Low stroke-to-bore ratios mean large valves can be fitted, which improves volumetric efficiency and hence specific output for a given manifold pressure.…”

Section: The 2010s: Aggressive Co 2 Targets Electrification and Downs...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 2010s: Aggressive Co 2 Targets Electrification and Downs...mentioning

confidence: 99%

Knock: A Century of Research

Corrigan¹,

Fontanesi²

2021

SAE Int. J. Engines

View full text Add to dashboard Cite

show abstract

“…to 11.0 [19,[27][28][29][30]. In the case of recently developed natural aspirated (NA) GDI engines, the CR normally ranges from 11.0 to 13.0 [16,31,32], while the highest CR reported in the development stage is 15.0 [31]. The CR in a high boost design is limited by knocking; therefore, NA systems are able to take advantage of peak thermal efficiencies [31].…”

Section: Development Of Gdi Combustion Systemsmentioning

confidence: 99%

“…[47] in faster fuel mixing and increased turbulence that improve the burning velocity, reduce PM/PN and suppress knocking. Typically, the tumble ratios in recent combustion systems have been in the range of 1.93 to 2.8 [27,41,42], although there has been a report of a prototype engine with a ratio of approximately 3.4 [16]. Figure 4 shows the structures of typical sprays generated by multi-hole, outward-opening and slit nozzles.…”

Section: Development Of Gdi Combustion Systemsmentioning

confidence: 99%

“…A previous study has determined that a high tumble ratio is important in GDI engine downsizing [16], because it results Fig. 4 Spray structures of outward-opening, multi-hole [21] and slit nozzles [43] (Courtesy to SAE International).…”

Section: Development Of Gdi Combustion Systemsmentioning

confidence: 99%

“…Recent studies [13][14][15] have shown that GDI combustion systems tend to consist of a combination of air-guided and spray-guided configurations. Spray guiding is used as part of a stratified strategy incorporating late injections to eliminate impingement, while the in-cylinder air motion and turbulence are emphasized in the combustion system designs [16]. Figure 1 shows the typical configurations of side-mounted and central-mounted injectors.…”

Section: Development Of Gdi Combustion Systemsmentioning

confidence: 99%

See 2 more Smart Citations

Recent Progress in Automotive Gasoline Direct Injection Engine Technology

Shuai

et al. 2018

Automot. Innov.

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Gasoline direct injection (GDI) engines are currently the dominant powertrains for passenger cars. With the implementation of increasingly stringent fuel consumption and emission regulations worldwide, GDI engines are facing challenges owing to high particulate matter emissions and a tendency to knock, leading to a change in the research and design (R&D) issues compared with those in the twentieth century. This paper reviews the progress in research regarding GDI engine technologies over the past 20 years, focusing on combustion system configurations, and also highlights common issues in GDI R&D, including preignition and deto-knock, soot formation and PM emissions, injector deposits and gasoline compression ignition (GCI). First, an overview of recent developments in the field as driven by regulations is provided, following which progress in injection and combustion systems is examined. Third, the review addresses the occurrence and mechanism of deto-knock and considers means of suppressing this phenomenon. The fourth section discusses soot formation mechanisms and particulate matter emission characteristics of GDI engines and describes the application of gasoline particulate filter (GPF) after-treatment. The subsequent section summarizes studies regarding injector deposit formation, as well as pioneering research into GCI combustion modes. Finally, a summary and future prospects for GDI engine technologies are provided.

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Overview, Advancements and Challenges in Gasoline Direct Injection Engine Technology

Kalwar

Ágarwal

2019

Advanced Combustion Techniques and Engine Technologies for the Automotive Sector

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New Combustion and Powertrain Control Technologies for Fun-to-Drive Dynamic Performance and Better Fuel Economy

Cited by 15 publications

References 4 publications

Knock: A Century of Research

Knock: A Century of Research

Recent Progress in Automotive Gasoline Direct Injection Engine Technology

Overview, Advancements and Challenges in Gasoline Direct Injection Engine Technology

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