Injection holes of an injection nozzle are respectively formed such that an inner diameter of an outer opening is larger than an inner diameter of an inner opening. Furthermore, the injection holes are formed such that when an imaginary plane, which includes a valve seat portion that is a portion of a valve seat and is adjacent to the injection hole, is extended toward a central axis, the imaginary plane first intersects with an injection hole inner wall portion of an injection hole inner wall of the injection hole.

A spark-ignition direct fuel injection valve includes, at least, a seat member provided with a fuel injection hole and a valve seat and a valve body which controls fuel injection from the injection hole by contacting and separating from the valve seat. In the spark-ignition direct fuel injection valve: the injection hole has an injection hole inlet which is open inwardly of the seat member and an injection hole outlet which is open outwardly of the seat member; an opening edge of the injection hole inlet has a first round-chamfered portion formed on an upstream side with respect to a fuel flow toward the injection hole inlet; and an extending length (L) of the injection hole does not exceed three times a hole diameter (D) of the injection hole.

Methods and systems are provided for direct fuel injection. In one example, a fuel injector system includes an injector needle with an injector pin with a curved fuel channel around the outer circumference of the injector pin, fluidically connected along the length of the curved fuel channel with a fuel reservoir inside the injector pin. An actuator coupled to the injector needle may sequentially move and position the injector needle to establish fluidic connection between the curved fuel channel and with one or more nozzle holes of the fuel injector at each position, discharging fuel from only those nozzle holes, thereby minimizing fuel spray interaction.

Injection holes of an injection nozzle are respectively formed such that an inner diameter of an outer opening is larger than an inner diameter of an inner opening. Furthermore, the injection holes are formed such that when an imaginary plane, which includes a valve seat portion that is a portion of a valve seat and is adjacent to the injection hole, is extended toward a central axis, the imaginary plane first intersects with an injection hole inner wall portion of an injection hole inner wall of the injection hole.

An internal combustion engine includes a cylinder receiving air during operation through an intake air fluid passage, an engine component that at least partially forms a section of the intake air fluid passage, and a gas diffuser having a tip disposed within the intake air fluid passage. A gas injector housing is connected to the body portion of the gas diffuser. The gas diffuser is structurally interchangeable with other gas diffusers such that gas dispersion in various engine applications can be modified by installing an appropriate gas diffuser and otherwise maintaining common engine parts.

A variable orifice fuel injector has an inward opening needle valve and an outward opening needle valve and has means to directly inject two types of fuels independently and collectively. Both needle valves are fully contained in a nozzle body, with a co-axial smaller needle valve at least partially being contained in a larger needle valve.

The present invention is a compression-ignition direct-injection internal-combustion engine comprising at least a cylinder, a cylinder head carrying fuel injection, a piston sliding in the cylinder, a combustion chamber limited on one side by upper face of the piston comprising a projection extending in the direction of the cylinder head and in the center of a concave bowl (46) with at least two mixing zones. The fuel injection projects fuel in at least two fuel jet sheets with different sheet angles, with a lower sheet having a jet axis C1 for one zone and an upper sheet having a jet axis for the other zone.

The injection feeds fuel into the combustion chamber with a different flow rate for each sheet for dedicated targeting in the mixing zones of the combustion chamber.

A spark-ignition direct fuel injection valve includes, at least, a seat member provided with a fuel injection hole and a valve seat and a valve body which controls fuel injection from the injection hole by contacting and separating from the valve seat. In the spark-ignition direct fuel injection valve: the injection hole has an injection hole inlet which is open inwardly of the seat member and an injection hole outlet which is open outwardly of the seat member; an opening edge of the injection hole inlet has a first round-chamfered portion formed on an upstream side with respect to a fuel flow toward the injection hole inlet; and an extending length (L) of the injection hole does not exceed three times a hole diameter (D) of the injection hole.

In a fuel injection spray pattern for an opposed piston engine, the individual spray plumes have both radial and tangential components with respect to an injection axis (102, 114, 121), which adds a swirl component to a spray pattern of fuel directly injected into the combustion chamber of the opposed piston engine.

In a fuel injection valve, it is possible to obtain spray in which the penetrating force of injected fuel is suppressed. The fuel injection valve includes a valve seat that forms a gap with a valve body, the gap allowing fuel to pass therethrough, and multiple injection holes that are located further downstream from the gap. The fuel to which pressure is applied flows out from the injection holes. When the flow velocity of the fuel in the gap formed between the valve body and the valve seat is indicated by meters per second, the flow velocity is set to be greater than a value obtained by multiplying the square root of the pressure applied to the fuel by 28. In this manner, the flow velocity in the gap increases, and flow velocity distribution inside the injection hole is uniformized, thereby suppressing an increase in penetration.