A gas injector for directly injecting a gaseous fuel into a combustion chamber of an internal combustion engine, including a valve closure element for releasing and closing a passage opening, the valve closure element opening in the direction of a flow direction of the gas injector, a sealing seat between the valve closure element and a valve body, a flow-guiding element being situated downstream of the sealing seat in the flow direction of the gas injector and configured to form a gas jet to be injected into the combustion chamber.

A supplemental fuel system includes a supplemental fuel tank, an electronic valve, a temperature sensor, and a controller. The supplemental fuel tank is configured to store a supplemental fuel configured to supplement a primary fuel used by an engine. The electronic valve is configured to be positioned between the supplemental fuel tank and an air supply system for the engine. The temperature sensor is configured to acquire temperature data regarding a temperature of the engine. The controller is configured to control the electronic valve such that the electronic valve is (i) closed to prevent the supplemental fuel from being provided to the air supply system in response to the temperature being less than a temperature threshold and (ii) open or openable to permit the supplemental fuel to be provided to the air supply system in response to the temperature being greater than the temperature threshold.

A nozzle cap for a fuel injection nozzle operable in a hydrogen internal combustion engine includes an inlet for receiving a flow of hydrogen controllable by an inlet valve arrangeable in the inlet, at least one outlet for providing an exit flow of hydrogen, and an internal bottom flow-guiding body arranged at a bottom side of the nozzle cap downstream of the inlet in a nozzle cap volume, the internal bottom flow-guiding body protruding towards the inlet and comprises a flow-guiding surface for re-directing a flow of hydrogen from the inlet towards the outlet.

A fuel injection device includes a coil, a stator provided on an inner side of the coil, a housing including an injection hole at an end opposite to a stator side in an axial direction, a movable element including a movable element main body that generates a first gap with the stator and a stopper portion provided to an injection hole side of the movable element main body, and provided inside the housing in a reciprocable manner, a main valve including a lock portion that generates a second gap smaller than the first gap together with an end face of the stopper portion on the stator side, and provided to open and close the injection hole, a first pushing portion constantly pushing the movable element to the injection hole side, and a second pushing portion constantly pushing the main valve to the stator side.

A nozzle cap for a fuel injection nozzle operable in a hydrogen internal combustion engine includes an inlet for receiving a flow of hydrogen controllable by an inlet valve arrangeable in the inlet, at least one outlet for providing an exit flow of hydrogen, and an internal bottom flow-guiding body arranged at a bottom side of the nozzle cap downstream of the inlet in a nozzle cap volume, the internal bottom flow-guiding body protruding towards the inlet and comprises a flow-guiding surface for re-directing a flow of hydrogen from the inlet towards the outlet.

A supplemental fuel system for a machine with an engine is configured to monitor a voltage of a power supply of the machine based on voltage data acquired by a voltage sensor where the power supply is configured to receive power from an alternator driven by the engine, compare the voltage to a voltage threshold, and control an electronic lock off valve positioned between a supplemental fuel tank and an air supply system for the engine such that the electronic lock off valve is (i) closed to prevent a supplemental fuel from being provided from the supplemental fuel tank to the to the air supply system in response to the voltage being less than the voltage threshold and (ii) open or openable to permit the supplemental fuel to be provided to the air supply system in response to the voltage being greater than the voltage threshold.

A fuel injection arrangement admits a flow of hydrogen into a combustion chamber of hydrogen internal combustion engine. The fuel injection arrangement has a nozzle cap and an inlet valve arrangement. An inner surface of the nozzle cap comprises a nozzle protrusion protruding radially towards an envelope surface of a flow guiding portion of the inlet valve arrangement. The nozzle protrusion is arranged axially between a valve protrusion of the inlet valve arrangement and an outlet of the nozzle cap. The valve protrusion and the nozzle protrusion at least partly overlap in a radial direction.

A fuel injector for injecting gaseous fuels into a combustion chamber, comprising an injection nozzle including a nozzle cap, and an outward opening injection needle. The injection nozzle has a longitudinal injector axis and a tip region that is shaped to define a valve seat that extends about a central outlet opening for gaseous fuel. The outward opening injection needle is slidably received in the injection nozzle and is engageable with the valve seat to control a flow of gaseous fuel into a sac volume of the fuel injector. The nozzle cap is received over the tip region to define the sac volume, and is provided with a plurality of openings to enable the flow of gaseous fuel to pass from the sac volume into the combustion chamber when the injection needle is moved away from the valve seat. The plurality of openings comprise at least a first opening and a second set of openings.

System and methods for controlling a flow of fluid in a fuel system are disclosed. In an aspect, a gas admission system includes a gas admission valve assembly having an inlet, an outlet, and a valve configured to control a flow of fluid between the inlet and the outlet and a flow limiter assembly in fluid communication with the inlet of the gas admission valve assembly.

There is provided a valve assembly comprising a valve housing. The valve housing comprises a fluid inlet, a fluid outlet, a valve opening, and a valve seat surrounding the valve opening, The valve opening is disposed between the fluid inlet and the fluid outlet. The valve assembly further comprises a ball valve element disposed within the valve housing, a spring arranged to urge the ball valve element onto the valve seat to close the valve opening, and a drive pin having a first end and a second end, the drive pin being aligned with the valve opening. The valve assembly is movable between a closed position, in which the ball valve element is held in the valve seat by the spring, closing the valve opening, and an open position, in which the first end of the drive pin extends through the valve opening to push the ball valve element away from the valve seat, opening the valve opening. At least one of the spring, ball valve element, valve seat, and first end of the drive pin includes a hard surface treatment. There is also provided a fluid injection system for injecting a fluid comprising a source of a fluid and a valve assembly, the source of a fluid being connected to the fluid inlet of the valve assembly.