Gasoline direct injection engine
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsKazuhiro Takashiba, Naoaki Takeda, Yutaka Kohda
Life of this patent
Estimating the term…
Abstract
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.
Claims6
A gasoline direct injection engine, comprising:
- a cylinder block defining a cylinder;
- a piston slidably received in said cylinder and having a top surface defining a reference surface, said top surface including a recess recessed from said reference surface, a raised surface raised from said reference surface formed around said recess, and a sloping surface extending between said raised surface and said reference surface;
- a cylinder head attached to an end of said cylinder block to define a combustion chamber in said cylinder in cooperation with said piston, said combustion chamber defining a roof surface opposing said sloping surface;
- a fuel injection valve having a nozzle communicating with said combustion chamber;
- and
- a spark plug having an electrode facing said recess;
- wherein a first angle formed between said sloping surface and a plane perpendicular to a cylinder axial line is less than a second angle formed between said roof surface and said plane so as to define a progressively widening gap between said roof surface and said sloping surface toward said recess.
Dependencies are inferred from the claim text.