A fuel injector for an engine includes: a solenoid unit including a plurality of solenoids that can be separately controlled; a valve body having a control chamber connected with a supply throttle and a return throttle; and a plurality of armatures disposed between the solenoid unit and the valve body to be able to adjust the amount of fuel that is discharged through the return throttle by being driven by the solenoids of the solenoid unit.

In at least some implementations, a charge forming device for a combustion engine includes a throttle body and a throttle valve. The throttle body has a throttle bore with an inlet through which air flows into the throttle bore and an outlet from which a fuel and air mixture exits the throttle bore. The throttle bore has a throat between the inlet and outlet and the throat has a reduced flow area compared to at least one of the inlet and outlet. The throttle valve has a valve head received within the throat of the throttle bore and movable relative to the throttle body between a first position and a second position wherein the flow area between the valve head and the throttle body is greater when the valve head is in the second position than in the first position.

A fuel injector for a combustion engine is disclosed. The fuel injector includes an injector body having a nozzle orifice, a solenoid coil mounted in the injector body, a control chamber filled with high-pressure fuel, an armature moved by electromagnetic force of the solenoid coil to vary fuel pressure in the control chamber, and a needle that moves to open or close the nozzle orifice according to the variation in the fuel pressure in the control chamber. The fuel injector further includes piezoelectric actuator for adjusting a fuel injection rate by adjusting an opening speed of the nozzle orifice based on a load condition of the engine.

In a fuel injection valve including a variable lift mechanism of two or more stages, when fuel is injected with a lift different from a command, exhaust emission deterioration and torque fluctuations may occur.

A control device for a fuel injection valve including a variable lift mechanism of two or more stages is provided, which senses a drive lift of the fuel injection valve from an inflection point of a drive current during valve opening operation or a drive voltage during valve closing operation, and limits the command drive lift when the sensed drive lift is different from a command drive lift.

A fluid injector for injecting fluid is disclosed, including a body; a fluid passageway defined in the body and extending from an inlet to an outlet of the fluid injector; a valve seat disposed internally of the body and forming part of the passageway; a valve element that is selectively reciprocated relative to the valve seat to close and open the passageway to fluid flow by seating and unseating the valve element on and from the valve seat, respectively; and an orifice disc disposed in the passageway downstream of the valve seat in a direction of the fluid flow through the fluid injector, the orifice disc including a plurality of dimples and a plurality of orifices defined through the orifice disc, each dimple including at least one orifice located thereon and each dimple having an asymmetrical cross-section.

A control valve assembly of a fuel injector includes a first valve arrangement wherein a first valve spool is guided in a first hydraulic bore provided in a body of the assembly. The control assembly further includes a first tubular sleeve having a seating portion which end face defines the first seating face, the first sleeve being fixed in the first hydraulic bore and the first spool extending through the sleeve.

An electromagnetically-driven injector may include a valve body of an on-off valve biased in a valve-closed direction by a coil spring, which is arranged in a stroking direction of the valve body, and at least one plate spring, which is provided at a right angle in the stroking direction of the valve body and arranged in such a manner as to support the valve body, and keeps a valve-closed state when energization is not provided. The at least one plate spring may include a plurality of plate springs arranged in the stroking direction of the valve body.

A fuel injector for direct injection of fuel into a combustion chamber includes: a housing having at least one combustion chamber-side injection aperture; a linearly movable valve needle for opening and closing the injection aperture; a solenoid; an armature which is linearly movable by the solenoid; and a first sleeve attached to the armature. A first stop surface facing away from the combustion chamber is formed on the first sleeve, and a second stop surface facing the combustion chamber is formed on the valve needle, the first and second stop surfaces striking one another when the valve needle and/or the armature is/are moved linearly.

An injection hole body has injection holes to inject fuel. A valve body forms a fuel passage with an inner surface of the injection hole body to communicate with inflow ports of the injection holes. The valve body opens and closes the fuel passage by being seated on and unseated from a seating surface of the injection hole body. An inflow port gap distance is a gap between the valve body and the inflow ports along a center axis of the valve body. An inter-injection hole distance is a distance between inflow ports, which are adjacent to each other, among the inflow ports placed around the center axis. The inter-injection hole distance is smaller than the inflow port gap distance in a state where the valve body is unseated from the seating surface and is at a farthest position in its movable range.

An injection hole body has an injection hole to inject fuel for causing combustion in an internal combustion engine. A valve body is unseated from and seated on a seating surface of the injection hole body. The injection hole body and the valve body form a fuel passage therebetween to communicate with an inflow port of the injection hole. The fuel passage is opened and closed by unseating and seating of the valve body. A resilient member generates a resilient force to urge the valve body toward the seating surface. A seat angle is an angle between two straight lines appearing in a cross section of the seating surface, the cross section including a center axis of the valve body. The seat angle is 90 degrees or less.