Direct injection spark ignition engine
AssigneeFord Global Technologies, LLC
InventorThomas Tsoi Hei Ma
Life of this patent
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Abstract
An internal combustion engine is disclosed in which, at least during part load and full load operation of the engine, fuel is injected into the combustion chamber (10) during the intake stroke while an intake valve (26) is open by means of an injector (50) positioned in an unswept part of the cylinder bore (14). The fuel spary passes through the mouth of the intake valve (26) against the flow of high velocity air leaving the intake valve (26) and enters directly into the end of the intake port (20) penetrating laterally across the through-flow cross section of the intake port (20).
Claims7
A spark ignition internal combustion engine having a variable volume combustion chamber (10) defined by a cylinder head, a cylinder bore (14) and a piston (16) reciprocating within the cylinder bore (16), the cylinder head having a spark plug (40) and intake and exhaust ports (20,30) leading through intake and exhaust valves (24,34) into the combustion chamber, wherein a fuel injector (50) is provided in the combustion chamber for direct injection of liquid fuel, the fuel injector (50) being positioned in an unswept part of the cylinder bore (14) and being oriented such that the fuel is aimed by the injector (50) along a line of sight that extends from the injector (50) through the mouth of the intake valve (24) when the intake valve is open and reaches directly into the end of the intake port (20), whereby fuel droplets from the injector (50) may pass into the end of the intake port without first impinging on the rear surface of the intake valve.
A method of operating an internal combustion engine, in which, at least during part load and full load operation of the engine, liquid fuel is injected into the combustion chamber during the intake stroke while an intake valve is open by means of an injector positioned in an unswept part of the cylinder bore, the fuel injector being oriented such that the fuel is aimed by the injector along a line of sight that extends from the injector through the mouth of the intake valve when the intake valve is open and reaches directly into the end of the intake port, whereby fuel droplets from the injector may pass into the end of the intake port without first impinging on the rear surface of the intake valve.
Dependencies are inferred from the claim text.