A metering system for a fuel atomizer includes a housing having a fuel inlet and an oxidizer inlet arranged coaxially, and an oxidizer metering device having a plurality of oxidizer channels, an oxidizer flow controller, and a fuel metering device. The oxidizer channels are spaced apart circumferentially in the housing and are arranged angled in at least one of a radially inward direction and a tangential direction to create a swirl of oxidizer flow in a mixing chamber of the fuel atomizer. The oxidizer flow controller is configured to control flow of oxidizer from the oxidizer inlet to the plurality of oxidizer channels. The fuel metering device is configured to control fuel flow from the fuel inlet to the mixing chamber.

A metering system for a fluid atomizer includes a housing, first and second metering members, and at least one solenoid. The housing includes a mixing chamber. The first metering member is operable to control flow of a first fluid to the mixing chamber. The second metering member is arranged coaxial with the first metering member and operable to control flow of a second fluid to the mixing chamber. The at least one solenoid is configured to operate at least one of the first and second metering members.

A metering system for a fluid atomizer includes a housing, first and second metering members, and at least one solenoid. The housing includes a mixing chamber. The first metering member is operable to control flow of a first fluid to the mixing chamber. The second metering member is arranged coaxial with the first metering member and operable to control flow of a second fluid to the mixing chamber. The at least one solenoid is configured to operate at least one of the first and second metering members.

Operating a fuel injector in a fuel system for an engine includes energizing a first solenoid actuator to move a spill valve from a first position to a second, closed position, and energizing a second solenoid actuator to move a fuel injection valve in the fuel injector from a closed position to an open position. A pull-in tier of a waveform energizing the second solenoid actuator is generated via a first current produced by a boosted voltage power supply and a second current produced by a lower voltage power supply. Arrival timing of the valve at the open position is detected based on a property of the second current, such that a valve arrival timing error may be used to trim the fuel injector. Related methodology and control logic is also disclosed.

An apparatus for controlling the lift of a valve member in a flow control valve comprises an end stop assembly having at least two pieces, a plunger with one end interposed between these pieces and biasing members that urge the pieces into contact with the plunger. The plunger is movable by an actuator to thereby move the pieces of the end stop assembly from a first position in which the pieces of the end stop assembly form a first surface for contacting the valve member to a second position in which the pieces form a second surface that comes into contact with the valve member when the valve member is lifted from its seated position, to thereby allow different discrete lifts of the valve member.

Various embodiments relating to controlling a fuel injection quantity of a fuel injector are provided. In one embodiment, a fuel injector for an internal combustion engine includes a fuel supply channel, a nozzle valve including a valve stem, and an actuator to actuate the nozzle valve. The nozzle valve and an inner wall of the fuel supply channel form a first flow cross section and at least one second flow cross section that is greater than the first flow cross section.

A fluid injector has a longitudinal axis (L) and a valve needle (12), which is axially moveable and operable to prevent a fluid injection in a closing position and to permit the fluid injection in further positions. The fluid injector also has an armature (14) which is mechanically coupled to the valve needle (12). Furthermore, the fluid injector has a solenoid assembly (30) which has at least a first and second coil (34, 36) and which is operable to magnetically actuate the armature (14) via an electrical signal (V) applied to at least one predetermined assortment of the at least two coils (34, 36).

A fluid injector includes a valve body, a valve needle and axially moveable in the valve body between a closing position that prevents a fluid injection and further positions that permit the fluid injection, an armature coupled to the valve needle for displacing the valve needle away from the closing position, and a solenoid assembly including at least a first and second coil and operable to magnetically actuate the armature via an electrical signal. A method for operating the fluid injector includes applying the electrical signal to the first coil to generate a magnetic field to move the armature for displacing the valve needle away from the closing position, evaluating a voltage across terminals of the first coil, and controlling the second coil with a further electrical signal to saturate a magnetic field in a portion of the valve body between the armature and solenoid assembly during evaluating the voltage.

A fuel injector for delivering gaseous fuel to an internal combustion engine comprises: a nozzle body having a nozzle bore; a first valve needle received within the nozzle bore and engageable with a first valve seat to control gaseous fuel delivery through at least one outlet of an injection nozzle; a first actuator arrangement for controlling movement of the first valve needle;

a second valve needle engageable with a second valve seat to control gaseous fuel delivery through at least one outlet of the injection nozzle; and a second actuator for controlling movement of the second valve needle. The second valve seat is defined by the first valve needle, which defines an internal flow path for gaseous fuel flow when the second valve needle is lifted from the second valve seat and the first valve needle is lifted from the first valve seat.

A system includes an injector having a scheduling valve assembly and a nozzle in fluid communication with the valve assembly. The scheduling valve assembly is configured for regulation of flow from an inlet of the injector to the nozzle. An electromagnetic device is operatively connected to a hydromechanical valve spool of the valve assembly to selectively adjust position of the valve spool in the valve assembly.