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A Rotary Valve Controlled High Expansion Ratio Gasoline Engine
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English
Abstract
A gasoline engine with the expansion ratio of 14:1 for better efficiency is presented. The engine has intake control rotary valves to reduce the effective compression ratio for knock avoidance and to cotrol power output. Computer simulation, based on the method of characteristics and quasi-steady model, indicated the advantage of the rotary valve system as well as the optimum design of the valve actuation. Experimental results showed a good agreement with the prediction, and BSFC of under 240 g/kWh was achieved at load higher than 50%. However, at very light load, the conventional throttle valve operation was inevitable, which somewhat worsened the advantage of the new system. The mileage for a car driving cycle and constant speeds were also estimated and it was forecast that optimized supercharging would significantly benefit the fuel economy.
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Citation
Ichimaru, K., Sakai, H., Kanesaka, H., and Winterbone, D., "A Rotary Valve Controlled High Expansion Ratio Gasoline Engine," SAE Technical Paper 940815, 1994, https://doi.org/10.4271/940815.Also In
References
- Kanesaka, H. Kanesaka Charge Control System Nainenkikan 20 250 251 1981
- Benson, R. S. The Thermodynamics and Gas Dynamics of Internal Combustion Engines 1 Oxford University Press 1982
- Lee, D. I. Analytical models of rotary valves and the application to internal combustion engines Ph.D. thesis The University of Tokyo 1989