An object is to provide a fuel injection valve that restricts attachment of fuel injected from an injection hole to a combustion chamber. A fuel injection valve including a plurality of injection holes on a front end section, each of the plurality of injection holes including an upstream hole formed on an upstream side and a downstream hole that is connected to the upstream hole, formed on a downstream side of the upstream hole, and has a diameter different from that of the upstream hole. A center axis of a first downstream hole is configured to be eccentric to a center axis side of the fuel injection valve relative to a center axis of a first upstream hole of a first injection hole. An eccentricity amount or an eccentricity direction of a downstream hole relative to an upstream hole of at least one of the other injection holes is different from an eccentricity amount or an eccentricity direction of the first injection hole.

A fuel delivery system and a direct injector for directly injecting fuel into a cylinder are provided. In one example, a direct fuel injector includes a nozzle in fluidic communication with a fuel source, the nozzle includes at least one fuel flow path that divides into two exit flow paths within the nozzle defining a plurality of exit orifices stemming from a common inlet orifice thereby improving the atomization and mixing of the fuel as it enters the cylinder. A plurality of spaced-apart divided fuel flow paths may be positioned within the nozzle to further optimize mixing and reduce wall and piston wetting.

The conventional penetration control has a problem that the penetrations of all the injection holes change. An object of the invention is to provide a fuel injection valve having a simple structure and capable of selectively controlling a penetration force of spray injected in a piston direction by a lift amount.

In order to solve the above problem, the fuel injection valve of the invention is a fuel injection valve for injecting fuel to a combustion chamber of an internal combustion engine, which includes a valve body that is lifted by any one of a first lift amount of a maximum valve body lift amount and a second lift amount smaller than the first lift amount. In a case where the maximum valve body lift amount of the valve body is the first lift amount, a flow path area of a seat portion is larger than a sum of flow path areas of all injection holes, and in a case where the maximum valve body lift amount of the valve body is the second lift amount, the flow path area of the seat portion is smaller than the sum of flow path areas of all the injection holes.

Methods and systems are provided for a fuel injector. In one example, a system may include an injection nozzle having a venturi shape with an upstream twisted fin arranged in a venturi inlet. The system may further include a downstream twisted fin arranged in a venturi outlet.

A fuel injection device is provided with reduced adherence of fuel spray with respect to an intake valve, a wall surface in an engine cylinder, or a piston. The fuel injection device includes a valve body and a seat surface to perform sealing of fuel cooperatively and injection holes. Inlet opening surfaces are formed on the seat surface. A first injection hole and a second injection hole arranged closest to the first injection hole. The first injection hole is larger than the second injection hole in an injection hole angle to be an angle formed by a normal direction of the seat surface and a center axis of the injection hole. The second injection hole is larger than the first injection hole in an area of a cross-section perpendicular to the center axis of the injection hole.

A fuel and gas mixing structure for an engine is provided. This mixing structure includes a body configured to be positioned between a fuel injector and a cylinder of an engine. The body defines an interior volume that is configured to receive gas from outside the body and to receive one or more streams of fuel from the fuel injector in the interior volume. The body also defines one or more mixture conduits configured to conduct plumes of the fuel and gas, while mixing, from the interior volume to one or more exit ports and therethrough to the cylinder.

A fuel delivery system and a direct injector for directly injecting fuel into a cylinder are provided. In one example, a direct fuel injector includes a nozzle in fluidic communication with a fuel source, the nozzle includes at least one fuel flow path that divides into two exit flow paths within the nozzle defining a plurality of exit orifices stemming from a common inlet orifice thereby improving the atomization and mixing of the fuel as it enters the cylinder. A plurality of spaced-apart divided fuel flow paths may be positioned within the nozzle to further optimize mixing and reduce wall and piston wetting.

Methods and systems are provided for an injector. In one example, the injector comprises at least two passages, wherein outlets of each of the passages are differently shaped than corresponding inlets of the passages. Further, in one or more examples, each of the outlets may be shaped and sized differently with respect to each other.

A liquid fuel injector for a fuel system in an internal combustion engine includes two injection control valves for controlling two outlet checks. A common nozzle supply cavity is fluidly connected to an inlet passage and supplies each of the two sets of nozzle outlets opened and closed by the outlet checks. A first nozzle outlet set forms a narrower spray angle and has a first combination of outlet number and outlet size, and a second nozzle outlet set forms a wider spray angle and has a second combination of outlet number and outlet size. The first nozzle outlet set has a greater steady flow than the second nozzle outlet set.

In an injection hole set, primary and secondary injection holes are formed to satisfy the following relationship: t1+t20.87P{circumflex over ()}0.52, where (deg) is an injection-hole-to-injection-hole angle, which is an angle formed between a primary central axis of the primary injection hole and a secondary central axis of the secondary injection hole; t1 (deg) is a primary taper angle, which is an angle formed between outlines of a primary injection hole inner wall of the primary injection hole in a cross section of the primary injection hole inner wall; t2 (deg) is a secondary taper angle, which is an angle formed between outlines of a secondary injection hole inner wall of the secondary injection hole in a cross section of the secondary injection hole inner wall; and P (MPa) is an average pressure of the fuel in a fuel passage at a time of injecting the fuel from the injection holes.