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US 7,597,085 B2Granted
Direct fuel injection-type spark ignition internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsTakeshi Ashizawa, Hiroshi Nomura, Osamu Tomino
Life of this patent
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Abstract
When a homogeneous combustion is to be executed at a lean air-fuel ratio, a tumbling flow that whirls in the cylinder descending in the cylinder bore on the exhaust valve side and ascending in the cylinder bore on the intake valve side, is intensified by the fuel that is injected from the fuel injection valve toward the exhaust valve side in the cylinder bore in the last stage of the intake stroke.
Claims9
A direct fuel injection-type spark ignition internal combustion engine comprising:
- a fuel injection valve arranged at or nearly at the center in an upper part of a cylinder, and
- an ignition plug arranged at the upper part of the cylinder,
- wherein the fuel injection valve is configured to direct most of an injected fuel to a one-fifth portion on a lower side of a cylinder bore wall on an exhaust valve side in a last stage of an intake stroke, so that a tumbling flow that whirls in the cylinder descending in a cylinder bore on the exhaust valve side and ascending in the cylinder bore on an intake valve side is intensified by the fuel that is injected from the fuel injection valve toward the exhaust valve side in the cylinder bore in the last stage of the intake stroke.
A direct fuel injection-type spark ignition internal combustion engine comprising:
- a fuel injection valve arranged at or nearly at the center in an upper part of a cylinder, and
- an ignition plug arranged at the upper part of the cylinder,
- wherein:
- the fuel injection valve is configured to direct most of an injected fuel to a one-fifth portion on a lower side of a cylinder bore wall on an exhaust valve side in a last stage of an intake stroke, so that a tumbling flow that whirls in the cylinder descending in a cylinder bore on the exhaust valve side and ascending in the cylinder bore on an intake valve side, is intensified by the fuel that is injected from the fuel injection valve toward the exhaust valve side in the cylinder bore in the last stage of the intake stroke, and
- a cavity formed in a top surface of the piston is configured to suppress attenuation of the tumbling flow.
2 more elements
Dependencies are inferred from the claim text.