A drive unit of a fuel injection device includes a driver circuit. The driver circuit opens and closes a valve element of the fuel injection device by supplying a drive current to the fuel injection device. The driver circuit supplies the drive current to open the valve element and sets the drive current to zero in an intermediate lift area. The intermediate lift area is an area is which a lift amount of the valve element is smaller than a maximum target lift amount.

A control device for a fuel injection valve including a variable lift mechanism of two or more stages is provided. The control device includes an inflection point detection unit for detecting an inflection point from at least one of a drive current when the fuel injection valve is opened or a drive voltage when the fuel injection valve is closed. The control device also includes a drive sensing unit for sensing a drive lift of the fuel injection valve from at least one of an inflection point of a drive current during valve opening operation or a drive voltage during valve closing operation. The control device is configured to limit the command drive lift when the sensed drive lift is different from a command drive lift.

A fuel injection control device includes a valve closing detection unit (54) to detect a valve closing timing by using either of an electromotive force quantity detection mode and a timing detection mode, a selection unit (21) to select either of the electromotive force quantity detection mode and the timing detection mode for detecting the valve closing timing, and a correction unit (21) to calculate a correction coefficient for correcting a requested injection quantity so as to reduce the difference between an estimated injection quantity and the requested injection quantity, and the selection unit selects the electromotive force quantity detection mode regardless of the value of the requested injection quantity when the calculation of the correction coefficient is not completed.

Valve assembly comprising: a valve body with an inlet and an outlet; a valve needle in the valve body preventing fluid flow through the outlet when closed and permitting the flow otherwise; a retaining element connected to the needle, extending radially and remote from the fluid outlet; and an electro-magnetic actuator to actuate the valve needle. The electro-magnetic actuator unit comprises an armature movable relative to the valve body. The armature defines a central axial opening through which the valve needle extends and slides on the valve needle. The retaining element limits the axial displacement of the armature. The armature comprises at least one axial slot arranged adjacent to and connected with the central axial opening, extending through the armature in the axial direction. The retaining element projects beyond the central axial opening and the axial slot projects beyond the retaining element in the radial outward direction.

An injection valve may include: a valve needle moving from a closed position to an open position; a calibration spring biasing the needle towards the closed position; an armature moving toward the pole piece to take the valve needle towards the open position with respect to the valve needle; and a pole piece. Some valves include a magnetic ring moving between a first position, with a top side spaced apart from the pole piece and an underside in contact with the valve needle, and a second position where the top side is in contact with the pole piece. A second spring is in parallel to the calibration spring. An upper retaining element connected to a shaft extends in radial direction to limit movement of the armature relative to the valve needle so that the armature connects to the upper retaining element to displace the valve needle towards the open position.

A fuel injector for fuel injection systems of internal combustion engines, in particular for direct injection of fuel into the combustion chamber of an internal combustion engine, is described, including a solenoid, an armature, which is acted upon by the solenoid in a closing direction by a return spring, and a valve needle, which is connected to the armature in a force-locked manner for actuation of a valve closing body, which together with a valve face forms a sealing seat. An adjusting element for adjusting the spring force of the return spring is situated in a connector sleeve which provides the fuel feed on the inlet side. The adjusting element is delimited toward the outside by a thin-walled sleeve, into which a disk-shaped throttle element having a throttle borehole is introduced as a separate insert part.

A fluid metering valve includes a valve needle that is actuatable by an electromagnetic actuator that includes an armature guided on and along a longitudinal axis of the valve needle with a movement limited by a stop surface on the valve needle. A projection of an edge of the stop surface extends into a projection plane, perpendicular to the longitudinal axis and at which the armature and stop surface are in contact temporarily during operation, through an opening of a conduit of the armature, dividing the opening into an inner surface on one side of the projection and an outer surface on the other side of the projection. A fluid exchange between inside and outside of an area between the stop surface and armature is via a path through the inner surface, conduit, and outer surface when the armature is in contact with the stop surface at the projection plane.

The present disclosure relates to internal combustion engines. Various embodiments may include a fuel injection system for delivering fuel to an internal combustion engine. For example, fuel injector may include a valve body having a cavity; a valve needle with a retainer moving in the cavity; an actuator assembly comprising: a spring element next to the valve needle; an electro-magnetic coil; an armature element movable in the cavity; and an anti-bounce device. The armature element may be between the retainer portion of the valve needle and the anti-bounce device. The anti-bounce device may impose a spring force and a hydraulic force for dampening a movement of the armature element. The anti-bounce device may comprise a spring portion exerting the spring force to close the valve needle and a hydraulic damper portion integrally connected to the spring portion.

Provided is a control device of a fuel injection device which can stabilize a behavior of a valve even when a voltage of a voltage source varies, and can reduce a deviation of an injection amount. The fuel injection device includes a valve and a coil which generates a magnetic attraction force to attract a movable element which drives the valve. A control device applies a predetermined voltage to the coil on the basis of an injection pulse, causes a drive current to flow to the coil until the drive current reaches a maximum current, drives the valve by attracting the movable element, and injects fuel. The drive current flowing to the coil is lowered from the maximum current before the valve reaches a desired maximum lift position, and a constant voltage lower than a predetermined voltage or 0 V is continuously applied to the coil until the valve reaches the desired maximum lift position.

Dispersibility of fuel in a combustion chamber is improved while adhesion of the fuel to a structure in the combustion chamber is suppressed, and a combustion state of the fuel in the combustion chamber is improved, thereby improving fuel efficiency and suppressing incomplete combustion. Therefore, in a fuel injection valve provided with the plurality of fuel injection holes surrounded by a seat portion, the fuel injection holes have different penetrations. At least one high-pressure fuel injection hole having the longest penetration and low-pressure fuel injection holes excluding the fuel injection hole are included. Among the inter-inlet distances of the adjacent fuel injection holes, an inter-inlet distance between the fuel injection hole and the fuel injection holes adjacent thereto is widest.