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.
New Mixture Formation Technology of Direct Fuel Injection Stratified Charge Si Engine (OSKA) - Test Result with Gasoline Fuel
Sae Technical Papers
1988 SAE International Off-Highway and Powerplant Congress and Exposition ; 1988
01.09.1988
Aufsatz (Konferenz)
Englisch
New Mixture Formation Technology of Direct Fuel Injection Stratified Combustion SI Engine (OSKA)
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