Gasoline direct injection engine

摘要

In a gasoline direct injection engine, the sloping surface formed on the top of the piston and the opposing roof surface of the cylinder head form mutually different angles with respect to a plane perpendicular to a cylinder axial line so that the intake air caught between the sloping surfaces of the piston and the opposing roof surface is gradually squeezed out of the gap between them, and is prevented from directly flowing into the recess at high speed. As a result, the mixture in the recess is kept at a favorable air/fuel ratio and the engine is enabled to operate in a stratified charge lean burn mode over a wide operating range.