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Effect of Gasoline Composition on Engine Performance
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English
Abstract
In order to clarify the effect of each gasoline component on engine performance during warm-up, changes in the air-fuel ratio and quantity of wall flow (liquid gasoline on the induction port) were measured using ordinary gasolines and model gasolines consisting of a blend of several hydrocarbons and MTBE (methyl-tertiary-butyl-ether). The unburned air-fuel mixture in a combustion chamber was sampled via a solenoid valve and analyzed by gas chromatography to investigate the vaporization rate of each component. The results show that MTBE has an important effect on driveability because it contains oxygen and easily vaporizes, resulting in a lean mixture in the transient state. The popular driveability index, T50 (50% distillation temperature), does not provide an adequate means of evaluating MTBE-blended gasoline. Heavy aromatics (C9+ aromatics) also have a significant effect on driveability because they tend to increase the wall flow quantity and promote the formation of a lean air-fuel mixture. Based on the results of this study, a new driveability index was devised for formulating automotive gasoline.
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Authors
Citation
Oda, K., Hosono, K., Isoda, T., Aihara, H. et al., "Effect of Gasoline Composition on Engine Performance," SAE Technical Paper 930375, 1993, https://doi.org/10.4271/930375.Also In
New Developments in Alternative Fuels and Gasolines for SI and Ci Engines
Number: SP-0958; Published: 1993-03-01
Number: SP-0958; Published: 1993-03-01
References
- Hoshi H. et. al Effects of Gasoline Composition on Exhaust Emissions and Driveability SAE paper 902094 1990
- Gething Jeff A. Distillation adjustment: An Innovative Step to gasoline Refomulation SAE paper 910382 1991
- Kanehara K. et. al Analyzing the Influence of gasoline Characteristics on Transient Engine performance SAE paper 912392 1991
- Ogawa T. et. al Analysis of Poor Engine Response Caused by MTBE-Blended Gasoline from the Standpoint of Fuel Evaporation SAE paper 920800 1992
- Shibata G. et. al Effect of Intake Valve Deposits and Gasoline Composition on S.I. Engine Performance SAE paper 922263 1992
- Nagaishi H. et. al An Analysis of Wall Flow and Behavior of Fuel in Induction Systems of Gasoline Engines SAE paper 890837 1989
- Iwano H. et. al An analysis of Induction Port Fuel Behavior SAE paper 912384 1991