The Relevance of Fuel RON and MON to Knock Onset in Modern SI Engines

Mittal, Vikram; Heywood, John B.

doi:10.4271/2008-01-2414

Cited by 83 publications

(44 citation statements)

References 7 publications

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“…Furthermore, for fuels which outperform iso-octane (100 RON) the values can only be extrapolated. As such, the CFR engine octane methods, developed in 1930, have received criticism for their relevance to the modern situation [27,[30][31][32]. Therefore, in an effort to further establish the antiknock performance of DMF, the authors have proposed an alternative method, which is closer to modern reality.…”

Section: Introductionmentioning

confidence: 95%

Ignition timing sensitivities of oxygenated biofuels compared to gasoline in a direct-injection SI engine

Daniel

Tian

et al. 2012

Fuel

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Section: Introductionmentioning

confidence: 95%

Ignition timing sensitivities of oxygenated biofuels compared to gasoline in a direct-injection SI engine

Daniel

Tian

et al. 2012

Fuel

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“…Advances and developments in IC engines from the standard CFR engine condition have shifted presure/temperature history in IC engines such that the fuel standards established in 1927, ASTM D2699 and D2700 [6,7], may not be able to accurately predict the autoignition characteristics of fuels in modern engines [15][16][17][18][19]. However, these two numbers are able to quantitatively evaluate the changes in autoignition chemistries of gasoline PRFs and gasoline fuels, as explained by Leppard [20].…”

Section: Introductionmentioning

confidence: 99%

Ignition delay time sensitivity in ignition quality tester (IQT) and its relation to octane sensitivity

Naser

Sarathy

Chung

2018

Fuel

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Cetane number (CN) is a commonly used metric to rate the ignition quality of distillate fuels. In this work, a concept of sensitivity in ignition delay time (IDT) obtained with an ignition quality tester (IQT) is proposed, which is correlated to octane sensitivity (OS), i.e., the difference between research octane number (RON) and motor octane number (MON). The concept is based on the determination of IDT using the ASTM D6890 standard and IDT obtained at a temperature lower than that prescribed by the standard. The IDT measured at this lower temperature is referred to as IDT l , which is obtained via a calibration procedure similar to the ASTM D6890 standard, but with a higher value of reference IDT for calibration with n-heptane. The IDT h (measured at the derived cetane number (DCN) ASTM D6890 condition) of a given test fuel and a binary primary reference fuel (PRF) mixture of iso-octane and n-heptane was measured to identify a PRF with matching IDT h as the test fuel. The ratio of low temperature IDTs of the non-PRF test fuel and PRF, i.e., IDT l,non-PRF /IDT l,PRF was defined as IDT sensitivity (IDS), which was correlated

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“…Sensitivity (S), is the difference between the RON and the Motor Octane Number (MON). K is an empirical constant independent of the fuel and dependent on the engine operating condition [32]. However, for gasoline fuels with zero sensitivity (S = RON -MON = 0) there is no a priori reason to assume that PRF would exhibit different oxidation and auto-ignition behavior at any engine condition.…”

Section: Introductionmentioning

confidence: 99%