Impact of Fuel Octane Rating and Aromatic Content on Stochastic Pre-Ignition

Mansfield, Andrew B.; Chapman, Elana; Briscoe, Kenneth

doi:10.4271/2016-01-0721

Cited by 20 publications

(7 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fuel composition and properties have been shown to have a relatively large impact on the frequency of pre-ignition occurrence [75,[96][97][98][99]. It is clearly evident and well established that aromatic content has a large positive correlation with the pre-ignition frequency [96,99], although the associated mechanism is not well understood.…”

Section: Fuel Propertiesmentioning

confidence: 98%

“…It is clearly evident and well established that aromatic content has a large positive correlation with the pre-ignition frequency [96,99], although the associated mechanism is not well understood. Mansfield et al [99] speculated that poor vaporization and incomplete combustion of low-reactivity aromatic compounds could result in the increase in deposits and soot formation, providing local ignition sites.…”

Section: Fuel Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Recent Progress in Automotive Gasoline Direct Injection Engine Technology

Shuai

et al. 2018

Automot. Innov.

View full text Add to dashboard Cite

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.

show abstract

Section: Fuel Propertiesmentioning

confidence: 98%

Section: Fuel Propertiesmentioning

confidence: 99%

Recent Progress in Automotive Gasoline Direct Injection Engine Technology

Shuai

et al. 2018

Automot. Innov.

View full text Add to dashboard Cite

show abstract

“…The LSPI number count is highly correlated with the fuel distillation and the fuel retention in the piston top ring area. 25,[100][101][102]134 Fuels with a higher boiling point have a greater tendency to wet the cylinder wall and mix with the lubricating oil in the piston crevice region. Some study indicate that fuels with an elevated aromatic content are particularly susceptible to such processes.…”

Section: Fuel Influence On Lspimentioning

confidence: 99%

“…A lower limit was set for the content of aromatics, which showed that, as the content of aromatics increased from 15% to 35%, the frequency of the super-knock increased from zero to approximately 100 events in 135,000 cycles. 38,102,103 Fuel volatility is a significant factor influencing the susceptibility to pre-ignition through local dilution of the lubricant by fuel. A higher frequency of pre-ignition was observed for the fuel featuring a higher fraction of low volatility compounds.…”

Section: Fuel Influence On Lspimentioning

confidence: 99%

Reasons influencing the formation of low-speed pre-ignition

Stępień

2022

International Journal of Engine Research

View full text Add to dashboard Cite

Low-speed pre-ignition (LSPI) is a problem for many highly boosted engines and constitutes a major industry challenge. This paper provides an overview of the reasons that might lead to low-speed pre-ignition. These reasons have been systematized and divided into four groups related to the engine, fuel, lubricating engine oil, and engine operating conditions. In the case of the engine, particular attention was drawn, among others, to the type of fuel injection, the method of mixture formation, the compression ratio, and piston design as important factors affecting the occurrence of pre-ignition in the case of stochastic self-ignition. The paper analyzes the influence of the engine operation and the adjustment of its operating parameters on the frequency of occurrence of low-speed pre-ignition. The paper extensively discusses the relationship between the engine lubricating oil including the oil base groups and its additives and the occurrence of abnormal combustion. The impact of different types of detergents was considered in more detail. The paper also describes the effects of the fuel properties on low-speed pre-ignition. The most important fuel properties from the point of view of its confirmed influence on the formation of low-speed pre-ignition are the its chemical composition, deposit control additives and volatility. The conclusion emphasizes that the operating conditions in a modern downsized, turbocharged gasoline engine can induce a low-speed pre-ignition problem, which can lead to destructive super-knock events. It was indicated that low-speed pre-ignition tends to become more prominent in the operating regime that is most beneficial to attaining improved fuel economy. Therefore, the solution to this problem is considered to be a key factor in further development of downsizing and improving the engine efficiency. An innovative element of the article, which distinguishes it from other similar articles, is the proposed logical division and systematization of the hitherto identified factors influencing the LSPI phenomenon. This has been done by separating, comprehensively listing and ordering these factors

show abstract

“…Part of the Co-Optima Boosted SI effort is a focus on improving the understanding of the fuel properties on the SPI propensity/phenomenon as increased SPI limits the practical magnitude of fuel economy gains that can be achieved with downspeeding and downsizing. Fuel properties are of specific interest to SPI and Co-Optima as previous studies (Amann et al 2011, Chapman et al 2014, Mansfield et al 2016a, Mansfield et al 2016b, Mayer et al 2016a) have found experimental evidence for fuel effects on SPI. Moreover, interaction of fuel sprays and lubricating oil in the top crevice region (Zahdeh et al 2011, Amann et al 2012) seems to be a contributing factor to SPI propensity.…”

Section: Low Speed Pre-ignitionmentioning

confidence: 99%

Co-Optimization of Fuels & Engines: Efficiency Merit Function for Spark-Ignition Engines; Revisions and Improvements Based on FY16-17 Research

Farrell

Zigler

Ratcliff

et al. 2018

View full text Add to dashboard Cite

This is one of a series of reports produced as a result of the Co-Optimization of Fuels & Engines (Co-Optima) initiative, a Department of Energy (DOE)-sponsored effort initiated to simultaneously investigate advanced engine designs and the enabling fuel properties. This firstof-its-kind effort is designed to provide American industry with the scientific underpinnings needed to maximize vehicle performance and efficiency and leverage domestic fuel resources, leading to greater transportation energy affordability, reliability, and security. Co-Optima brings together DOE's Office of Energy Efficiency & Renewable Energy (EERE), 9 national laboratories, 13 universities, and numerous industry and government stakeholders in a collaboration exploring solutions with potential for near-term improvements to the types of fuels and engines found in most vehicles currently on the road, as well as to the development of revolutionary engine technologies for a longer-term, higher-impact series of solutions. In addition to the EERE Vehicle Technologies and Bioenergy Technologies Offices, the Co-Optima team includes representatives from the

show abstract

Impact of Fuel Octane Rating and Aromatic Content on Stochastic Pre-Ignition

Cited by 20 publications

References 16 publications

Recent Progress in Automotive Gasoline Direct Injection Engine Technology

Recent Progress in Automotive Gasoline Direct Injection Engine Technology

Reasons influencing the formation of low-speed pre-ignition

Co-Optimization of Fuels & Engines: Efficiency Merit Function for Spark-Ignition Engines; Revisions and Improvements Based on FY16-17 Research

Contact Info

Product

Resources

About