Fuel injector assembly and fuel injection system

A fuel injection system configured to inject a compressed fuel directly into a combustion chamber of an internal combustion engine, the compressed fuel stored in a fuel storage tank at a fuel storage pressure and delivered to said fuel injection assembly through a fuel supply line at a fuel supply pressure that is lower than the fuel storage pressure, said fuel injection system comprising:

• a fuel injector connected to the fuel supply line, the fuel injector configured to inject the compressed fuel;
• an adapter valve positioned between said fuel injector and the combustion chamber, said adapter valve having an inlet and an outlet, said inlet adapted to receive a portion of said fuel injector, and said outlet in communication with the combustion chamber, said adapter valve allowing the compressed fuel injected by said fuel injector to be discharged from said outlet into the combustion chamber in an injection direction while preventing blowback gas from passing through said adapter valve in an ingress direction opposite said injection direction;
• a crank angle sensor that detects a crank angle of a crank shaft of the internal combustion engine;
• an injection timing control unit programmed to compare said crank angle detected by said crank angle sensor to determine a current stroke of a cylinder of the internal combustion engine, said injection timing control unit programmed to control said fuel injector to initiate injection at a beginning of an intake stroke, and said injection timing control unit programmed to control said fuel injector to inhibit injection after a completion of said intake stroke.

A fuel injector assembly adapted to inject a compressed fuel directly into a combustion chamber of an internal combustion engine, the compressed fuel stored in a fuel storage tank at a fuel storage pressure and delivered to said fuel injection assembly through a fuel supply line at a fuel supply pressure that is lower than the fuel storage pressure, said fuel injector assembly comprising:

• a fuel injector connected to the fuel supply line, the fuel injector configured to inject the compressed fuel;
• and
• an adapter valve positioned between said fuel injector and the combustion chamber, said adapter valve having an inlet and an outlet, said inlet adapted to receive a portion of said fuel injector, and said outlet in communication with the combustion chamber, said adapter valve having a housing that includes an annular seat portion, a bullet chamber, and a bullet slidingly received within said bullet chamber, said bullet having a first end, an annular engagement portion adjacent said first end, an internal cavity, and a plurality of passages that connect an exterior of said bullet to said internal cavity,
• said bullet moveable between an injection position and a closed position, in said injection position compressed fuel injected by said fuel injector passes through said bullet via said plurality of passages to be discharged from said outlet into the combustion chamber in an injection direction, and in said closed position said annular engagement portion engages with said annular seat portion to prevent blowback gas from passing through said bullet in an ingress direction opposite said injection direction.