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New Mixture Formation Technology of Direct Fuel Injection Stratified Charge Si Engine (OSKA) - Test Result with Gasoline Fuel
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Abstract
The new idea incorporates an impinging part in the central piston cavity. A relatively low injection pressure, lower than that of a conventional IDI Diesel engine, and a single hole fuel nozzle are used. The fuel spray is injected against the impinging part, spreads and forms a fuel-air mixture. Since a comparatively rich fuel-air mixture always stays around the impinging part and ignition is accomplished near the center of the mixture, steady, instantaneous and high-speed combustion is possible.
As the fuel-air mixture is formed mostly in the cavity, there is little fuel in the squish area. Therefore, it is possible to prevent end-gas knocking, and in spite of the use of spark ignition, to employ a higher compression ratio than that of the conventional premixed SI engine. Experiments with a single cylinder prototype (4-stroke cycle) engine with gasoline fuel showed that the maximum BMEP was 1.0 MPa and the maximum brake thermal efficiency was 37.7 % (217 g/kW.h). The maximum BMEP is almost equivalent to that of a carbureted automobile gasoline engine, and the brake thermal efficiency is equivalent to that of a Direct Injection Diesel engine with the same displacement volume. Exhaust emission was also measured.
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Citation
Kato, S. and Onishi, S., "New Mixture Formation Technology of Direct Fuel Injection Stratified Charge Si Engine (OSKA) - Test Result with Gasoline Fuel," SAE Technical Paper 881241, 1988, https://doi.org/10.4271/881241.Also In
References
- Kato S. Onishi S. “New Mixture Formation Technology of Direct Fuel Injection Stratified Combustion SI Engine (OSKA)” SAE Paper 871689 1987
- Matsuoka S. et al The 3rd Internal Combustion Engine Symposium of Japan 1982
- Karita S. et al The Bulletin of JSME (Part B) 51 471 1985
- Saito A. et al The 6th Internal Combustion Engine Symposium of Japan 1987
- Yoshikawa S. et al The 6th Internal Combustion Engine Symposium of Japan 1978
- Tani Y. et al The 6th Internal Combustion Engine Symposium of Japan 1987
- Matsuoka S. et al “The Thermal Efficiency and a Future Concept of Gasoline Engine and Diesel Engine from the View Point of Cycle Theory” Internal Combustion Engine Sankaido 21 265 1982-7