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Improving the Fuel Economy of Supercharged Engine
Technical Paper
2013-32-9118
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The paper reviews the experimental development of fuel economy of engine powering the 2012 Formula SAE single seat race car of the University of Sophia. The balance of high power and low fuel consumption is biggest challenge of racing engine. It was found that improving the efficiency of engine by supercharging as a way to achieve that. In order to adapt the supercharger for the engine, the important design points are below:
It was found that intake air blow-by gas at combustion chamber is increased in low engine speed. To improve that, the valve overlap angle was changed to adopt supercharged engine and improve effective compression ratio. Typically the racing engine demands maximum torque for performance but that does not imply that the air fuel ratio should be rich than theoretical. The point is the maximum torque of the engine is proportional to the amount of air intake. Therefore, supercharged engine is possible to increase the supercharging pressure for bigger torque. But the base engine is not prepared for bigger torque, the damage of the engine was considered. In order to avoid engine breakage, the lean air-fuel ratio was used and maximum torque was controlled not to exceed an engine limit. The aim air fuel ratio was change by engine speed to get more flat torque performance, and improved the fuel consumption.
Topic
Citation
Fukuhara, Y., Kimata, N., and Suzuki, T., "Improving the Fuel Economy of Supercharged Engine," SAE Technical Paper 2013-32-9118, 2013, https://doi.org/10.4271/2013-32-9118.Also In
References
- Hayashi Yoshimasa Studies on the Tokai University System of Lean Burn Engine and a Racing Car for Le Mans Proceedings of the School of Engineering of Tokai University 27 42 2002
- Manabe Takashi Study on Homogeneous Pre-Mixed Lean Burn SI Engine Yamanashi district conference 2005 101 102 2005