The invention relates to a device for metering two different liquid or gaseous fuels, comprising a nozzle element (4) in which a first pressure chamber (6) that can be filled with a first fuel is formed, wherein an outer nozzle needle (10) is received in the pressure chamber in a longitudinally movable manner. The outer nozzle needle (10) is equipped with a second pressure chamber (12) which can be filled with a second fuel and in which an inner nozzle needle (15) is arranged in a longitudinally movable manner, said inner nozzle needle interacting with an inner nozzle seal (16) formed in the outer nozzle needle (10) in older to open and close at least one inner injection opening (17). Furthermore, at least one outer injection opening (13) is provided which can be connected to the first pressure chamber (6), the at least one outer injection opening (13) being formed in the outer nozzle needle (10).

A dual-fuel injector for a fuel injection device, including: a liquid fuel injector unit with a nozzle needle assigned to a liquid fuel nozzle arrangement of the dual-fuel injector and which is stroke controllable via a first control chamber; and a gas injector unit with a gas nozzle needle assigned to a gas nozzle arrangement of the dual-fuel injector and which is stroke controllable via a second control chamber. Each of the control chambers can be impinged with a control fluid to control the stroke of the respective nozzle needle. The control fluid from both the control chambers can be discharged. The dual-fuel injector has a control fluid reservoir in which discharged control fluid from the first control chamber can be introduced; the dual-fuel injector is configured to impinge the second control chamber with control fluid from the control fluid reservoir for the stroke control of the gas nozzle needle.

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.

Operating an engine includes injecting a first charge of liquid fuel using a first set of nozzle outlets in a fuel injector, and injecting a second charge of liquid fuel using a second set of nozzle outlets in a fuel injector. The first charge is autoignited in a first engine cycle, and the second charge is autoignited in a second engine cycle, and may be used to pilot ignite a charge of gaseous fuel. Operating the engine further includes limiting errors in targeting of the second charge of liquid fuel caused by transitioning the engine from a first combination to a second combination of speed, load, and boost, by varying an injection pressure of the liquid fuel from the first engine cycle to the second engine cycle.

A fuel injector includes a nozzle having at least one first orifice. The at least one first orifice selectively injects a first fuel. An outer check is located movably within the nozzle. The outer check includes at least one second orifice. The at least one second orifice selectively injects a second fuel. An inner check is located movably and concentrically within the outer check. The at least one first orifice is adapted to selectively inject at least one of the first fuel and the second fuel therethrough based on a position of each of the outer check and the inner check.

A fuel injector includes a nozzle having at least one first orifice provided therein. The at least one first orifice is adapted to selectively inject one of a fuel and an oxidant. An outer check is disposed movably within the nozzle. The outer check includes at least one second orifice provided therein. The at least one second orifice is adapted to selectively inject an other of the oxidant and the fuel. An inner check is disposed movably and concentrically within the outer chock. The at least one second orifice is adapted to align with respect to the at least one first orifice to selectively inject the fuel and the oxidant together through the at least one first orifice based on a position of each of the outer check and the inner check.

Methods and systems are provided for a multi-hole nozzle of a fuel injector. In one example, a nozzle for a fuel injector may include multiple nozzle holes arranged at a nozzle tip, where each nozzle hole has a straight flow axis and a cross-section that twists around the straight flow axis, from an inlet to an outlet of the nozzle hole. Additionally, a long side of the cross-section may increase in length, along the nozzle hole, from the inlet to the outlet.

A liquid fuel injector such as for a dual fuel system in an internal combustion engine includes two-way injection control valves for controlling twin outlet checks. A first set of orifices are arranged in an A-F-Z pattern, and a second set of orifices are arranged in an A-F-Z pattern, within the fuel injector, among a high-pressure inlet passage, a low-pressure space, and first and second outlet check control chambers, respectively. A common nozzle supply cavity is fluidly connected to the high-pressure inlet passage and supplies each of two sets of nozzle outlets opened and closed by the twin outlet checks.

An injection nozzle that for a first fuel in a first mode and in a second mode ignition fluid for a second fuel is introduced. The injection nozzle includes an injection nozzle body with first and second injection orifices and a displaceable injection nozzle needle in the injection nozzle body. The first injection orifices have smaller injection orifice cross-sections than the second injection orifices and are arranged at a defined distance. In a first displacement direction for closing the orifices the first injection orifices are located in front of the second injection orifices and seen in a second displacement direction of the injection nozzle needle for the opening or unblocking of the orifices, the first injection orifices are located behind the second injection orifices.

A fuel injector for an internal combustion engine is disclosed. The fuel injector is installable in a cylinder head bore of a cylinder head of the engine and has a body region arranged to be received within the cylinder head bore, and a head region arranged to extend outside the cylinder head bore to protrude from the cylinder head when the injector is installed in the cylinder head bore. The injector includes a first valve needle arranged to control the injection of a gaseous fuel from a first outlet, a second valve needle arranged to control the injection of a liquid fuel from a second outlet, a gaseous fuel inlet for admitting the gaseous fuel to the injector, and a liquid fuel inlet port for admitting the liquid fuel to the injector. The gaseous fuel inlet is disposed in the body region of the injector, and the liquid fuel inlet port is disposed in the head region of the injector. The injector can also include an internal accumulator volume so that an external fuel rail is not necessary.