A fuel injection control device includes an electric controller controlling an opening and closing of an injector by energizing a coil in the injector, and a booster circuit boosting a battery voltage to generate a boost voltage. The electric controller includes a valve-opening control unit applying the boost voltage and then applying the battery voltage to the coil to execute a valve-opening control to generate a required valve-opening force, an open valve maintenance control unit applying the battery voltage to the coil to execute an open valve maintenance control to generate an open valve maintenance force and is smaller the required valve-opening force, after the valve-opening control, and a current correction control unit executing a current correction control to correct a maximum value of a current flowing through the coil when the boost voltage is applied in the valve-opening control, according to a decreasing quantity of the battery voltage.

An actuator assembly of a digital inlet valve for a fuel pump adapted to cooperate with an inlet valve member includes an actuator body in which is fixed a coil, a cover closing the body and, a magnetic core arranged in a core guiding bore provided in the actuator body. The magnetic core is slidable along a main axis in order, in use, to close an air gap under the influences of a first compression spring, and of a magnetic field, the core cooperating with the valve member.

Embodiments may provide a fuel injector including a nozzle body having one or more nozzles, each capable of spraying a fuel from a respective spray position, and movable to change the spray position from a first position to a second position. An injector needle may be configured for axial movement relative to the nozzle body from an engaged position, to prevent flow through the one or more nozzles, to a disengaged position. The movement of the one or more nozzles from the first position to the second position and then back to the first position may substantially correspond with, and/or may be substantially be determined by, the relative axial movement between the injector needle and the nozzle body from the engaged position to the disengaged position and then back to the engaged position.

A valve device includes a valve housing having a hole and a seat provided on a periphery of the hole, a tubular member, a valve member opening the hole when moving away from the seat and closing the hole when being in contact with the seat, an urging member urging the valve member in a valve closing direction or a valve opening direction, an intermediate member being immovably relative to the tubular member, an adjusting member having a communication passage and configured to adjust an urging force of the urging member via the intermediate member according to a position relative to the tubular member when fixed to the tubular member, and a swelling member provided between the intermediate member and the tubular member and configured to be in contact with the intermediate member and the tubular member by swelling when touched with a fluid flowing through the hole.

A device and a method are provided for controlling a magnetic valve which has a coil and an armature which is displaceable by magnetic force, by means of which armature a closure element is displaceable for the purposes of injecting fuel into a combustion chamber, the method includes the steps of: energizing the coil with a voltage in accordance with a first voltage profile in order to generate a first electrical current through the coil; determining a first profile as a function of a first magnetic flux and the first current; identifying, in the first profile, a first characteristic of at least one first start of displacement at which the armature begins to displace the closure element, generating a second voltage profile and energizing the coil in accordance with the second voltage profile, such that, in a second profile, as a function of a second magnetic flux and a second current, a second characteristic of a second start of displacement is more similar to a reference characteristic than the first characteristic.

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 fuel injector that includes an injector control valve assembly. The injector control valve assembly includes a contact spring positioned between a fuel injector upper body and the injector control valve assembly to isolate a stator housing from clamping forces that occur during fuel injector assembly and clamping in an internal combustion engine. The injector control valve assembly further includes a cartridge configuration that permits preassembly of the injector control valve assembly prior to mounting in the fuel injector.

Embodiments may provide a fuel injector including a nozzle body having one or more nozzles, each capable of spraying a fuel from a respective spray position, and movable to change the spray position from a first position to a second position. An injector needle may be configured for axial movement relative to the nozzle body from an engaged position, to prevent flow through the one or more nozzles, to a disengaged position. The movement of the one or more nozzles from the first position to the second position and then back to the first position may substantially correspond with, and/or may be substantially be determined by, the relative axial movement between the injector needle and the nozzle body from the engaged position to the disengaged position and then back to the engaged position.

Provided is a prestroke adjustment method for a fuel injection valve capable of reducing variations in a prestroke amount regardless of the level of machining accuracy of a component. The prestroke adjustment method adjusts a prestroke amount D2 of a fuel injection valve 1 including a gap forming member 50 that forms a gap G2 defining a prestroke between a valve member 30 and engagement portions 33a and 423a of a movable core 42 by a second portion 52a abutting on the movable core 42 in a state where a first portion 51a is positioned at a reference position 33b of the valve member 30. In the prestroke adjustment method, a load L in the direction from the first portion 51a toward the reference position 33b of the valve member 30 is applied to the gap forming member 50 assembled to the valve member 30 to plastically deform the gap forming member 50, thereby shortening the relative length between the first portion 51a and the second portion 52a and setting the prestroke amount D2 to the target value T2.