New mixture formation technology of direct fuel injection stratified charge SI engine (OSKA) - test result with gasoline fuel

Conference · Fri Jan 01 04:00:00 EST 1988

OSTI ID:6101541

Kato, S; Onishi, S

The new idea described in this paper 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).

• OSTI ID: 6101541
• Report Number(s): CONF-8809204-
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330101* -- Internal Combustion Engines-- Spark-Ignition
CARBURETORS
COMBUSTION PROPERTIES
COMPARATIVE EVALUATIONS
CONTROL
DISPERSIONS
EFFICIENCY
ENGINES
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
FUEL-AIR RATIO
FUELS
GASOLINE
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
KNOCK CONTROL
LIQUID FUELS
MIXING
MIXTURES
NOZZLES
PETROLEUM PRODUCTS
SPARK IGNITION ENGINES
TESTING
THERMAL EFFICIENCY