The Effects of Equivalence Ratio on Knock in SI Engine

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  • 火花点火機関のノッキングに及ぼす混合気濃度の影響

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The effects of mixture equivalence ratio on knock in SI engines were investigated by a numerical simulation using the Lievengood-Wu integral in combination with a detailed chemical kinetic model of n-butane. This method could save the time-consuming of predicting knock and good validations were achieved on various operating conditions of a SI engine. The results showed that lean mixture did not always suppress knock in engines because the knock tendency depended not only on equivalence ratio but also on the pressure and temperature history of the unburned mixture.

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