Direct injection spark ignition engine

Details Direct injection spark ignition engine Direct injection spark ignition engine

1997-09-08

1999-08-24

Kwon, John

Internal-combustion engines

Combustion chamber means having fuel injection only

Combustible mixture stratification means

F02B 1700

Patent

active

059412070

ABSTRACT:
A stratified charge is formed in a direct injection engine by injecting fuel at a predetermined velocity, a predetermined droplet size, and forming the injected fuel with a hollow cone having a predetermined initial cone angle. The injected fuel thereby shallowly penetrates the combustion chamber so as to float therein to reduce wall-wetting and subsequent soot formation. A substantially flat top piston forms the injected fuel into a ball-shaped kernel during a compression stroke of the engine. The ball-shaped kernel remains substantially unmixed with the inducted air, thereby producing the stratified charge. The continued motion of the piston causes the ball-shaped kernel to move toward the spark plug for ignition.

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