Fuel-injected internal combustion engine with reduced squish factor
AssigneeBombardier Motor Corporation of America
InventorsTodd D. Craft, Erick Lee Gruber
Life of this patent
Estimating the term…
Abstract
A direct fuel injection internal combustion engine configured to reduce engine knock during high speed operation of the engine is provided. The engine comprises a cylinder head including a lower surface portion closing an upper end of a cylinder to define a combustion chamber between a piston upper surface and the cylinder head lower surface portion. The lower surface portion has therein an upwardly extending recess. The recess has a lower end which is complementary with the piston surface and an upper end. The lower end of said recess has an area in a plane perpendicular to a longitudinal axis of the cylinder and that area comprises a range from more than 20% to about 65% of the cross-sectional area of the cylinder.
Claims16
A direct fuel injection internal combustion engine comprising:
- an engine block defining a cylinder having a cross-sectional area;
- a piston reciprocally moveable longitudinally along a reciprocation axis and perpendicularly to the cross-sectional area in the cylinder, the piston having a recessed upper region defined by a planar surface that extends along an entire width of the recessed upper region and perpendicularly to the reciprocating axis;
- a cylinder bead including a lower surface portion of the cylinder to define a combustion chamber between the recessed upper region of the piston and the cylinder head lower surface portion, wherein the lower surface has therein a lower recess area greater than 20% of the cross-sectional area of the cylinder;
- a fuel injector;
- a fuel rail;
- a high pressure pump configured to pressurize a high pressure line to deliver fuel to the fuel injector through the fuel rail;
- and
- a pressure control valve coupled at one end of the fuel rail to regulate a pressure level of the fuel supplied to the fuel injector to maintain a substantially constant pressure thereat.
A direct fuel injection internal combustion engine comprising:
- an engine block defining a cylinder having a diameter D;
- a piston reciprocally moveable within the cylinder;
- and
- a combustion chamber positioned adjacently above an upper surface of the cylinder, the combustion chamber including a recess that asymmetrically oriented relative to a longitudinal axis extending centrally through the cylinder and having a height H, wherein H<0.5 D.
A direct fuel injection internal combustion engine comprising:
- an engine black defining a cylinder having a cross-sectional area;
- a piston reciprocally moveable longitudinally and perpendicularly to the cross-sectional area in the cylinder;
- and
- a cylinder head including a lower surface portion of the cylinder to define a combustion chamber between an upper region of the piston and the cylinder head lower surface portion, wherein the upper region has recess that extends perpendicularly with respect to a reciprocation axis of the piston and the lower surface portion has an area greater than 20% of the cross-sectional area of the cylinder, wherein the combustion chamber is asymmetrically shaped about the reciprocation axis.
Dependencies are inferred from the claim text.