In-cylinder direct injection spark ignition engine

摘要

In an in-cylinder direct injection spark ignition internal combustion engine comprising: a pent-roof combustion chamber (2) recessed on a cylinder head (1); a recess (4) formed on a crown surface of a piston (3); a spark plug (5) disposed at an approximately center of the pent-roof combustion chamber; and a fuel injection valve (7) located at a portion of the cylinder head adjacent to the intake port and faced against the piston to inject fuel in an obliquely downward direction with respect to the pent-roof combustion chamber, while part of sprayed fuel from the fuel injection valve (7) is set to direct uninterruptedly toward a surrounding of spark plug (5), a squish flow generated during a later period of a compression stroke is set to a direction approximately opposite to that of sprayed fuel set toward the surrounding of the spark plug (5). <IMAGE>