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Mechanism of Improving Fuel Efficiency by Miller Cycle and Its Future Prospect
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English
Abstract
We have introduced a supercharged Miller Cycle gasoline engine into the market in 1993 as an answer to the requirement of reduction in CO2 emission of vehicles. Improvement in the fuel economy of a supercharged Miller Cycle engine is achieved by the reduction of friction loss due to a smaller displacement.
The biggest problem of a conventional supercharged engine is knocking. In order to avoid the knocking, lower compression ratio, which accompanies lower expansion ratio, has been adopted by the conventonal engines and achieved insufficient fuel economy improvement. The Miller Cycle obtains superior anti-knocking performance as well as lowering compression ratio, while keeping the high expansion ratio. The decreased friction loss by the smaller displacement has completely lead to the improvement of fuel economy.
The supercharged Miller Cycle engine is the most practical system to make the brake thermal efficiency of gasoline engine close to that of a D I diesel engine, which seems to be an ultimate limit of improving the gasoline engine.
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Citation
Hitomi, M., Sasaki, J., Hatamura, K., and Yano, Y., "Mechanism of Improving Fuel Efficiency by Miller Cycle and Its Future Prospect," SAE Technical Paper 950974, 1995, https://doi.org/10.4271/950974.Also In
References
- Goto T. et al. Development of V6 Miller Cycle Gasoline Engine SAE 940198
- Miller R.H. Supercharging and Internal Cooling Cycle for High Output Trans. ASME69 1947
- Sakai H. et al. A Study on Miller Cycle Gasoline Engine Trans. of The 10th International Combustion Engine Symposium Japan 1985