The fuel injection valve includes a valve body having an injection hole at an end of the valve body facing in a first direction, and a needle valve provided inside the valve body and movable in an axial direction which includes both the first direction and a second direction opposite to the first direction. The needle valve is driven in the axial direction by a change in internal pressure of a back pressure chamber in the valve body. The fuel injection valve includes a control valve that controls the internal pressure of the back pressure chamber, and an actuator that drives the control valve. The control valve is longer than the needle valve in the axial direction. An end of the control valve facing in the second direction and the actuator are arranged away in the second direction from a center of the valve body in the axial direction.

A fuel system includes a plurality of fuel injectors each having an injection control valve assembly, a direct operated nozzle check, a high pressure nozzle supply passage, and a check control chamber. A common drain conduit fluidly connects to each of the plurality of fuel injectors to receive drained actuating fluid. A plurality of pressure regulating valves each having a static geometry are positioned fluidly between the common drain conduit and the check control chamber in one of the plurality of fuel injectors. Operating a fuel system according to the present disclosure includes limiting cross-talk between injectors in the fuel system.

A fuel system includes a plurality of fuel injectors each having an injection control valve assembly, a direct operated nozzle check, a high pressure nozzle supply passage, and a check control chamber. A common drain conduit fluidly connects to each of the plurality of fuel injectors to receive drained actuating fluid. A plurality of pressure regulating valves each having a static geometry are positioned fluidly between the common drain conduit and the check control chamber in one of the plurality of fuel injectors. Operating a fuel system according to the present disclosure includes limiting cross-talk between injectors in the fuel system.

A fuel injection controller includes a discharge switch that turns ON/OFF energization of a first energization path from a boost power source of a second booster circuit when a second control IC energizes a second solenoid, a first detection element that detects a value that depends on an energization state of the discharge switch, a constant current switch that turns ON/OFF energization of a second energization path from a power source voltage that outputs a lower voltage than a boost power source voltage when the second control IC energizes the second solenoid, a second element that detects a value that depends on an energization state of the constant current switch, and an energization path controller that switches energization to the second solenoid.

A filter for filtering hydraulic fluid in a hydraulically actuated fuel injector. The filter includes a first disc structure and a second disc structure disposed axially spaced apart from the first disc structure. The second disc structure is also disposed parallel to the first disc structure. The filter further includes an intermediate structure extending from the first disc structure to the second disc structure. The intermediate structure includes a first surface and a second surface disposed opposite and parallel to the first surface. The intermediate structure defines a plurality of passages extending from the first surface to the second surface. Each of the plurality of passages is perpendicular to a longitudinal axis of the filter.

A fuel injection device includes a valve mechanism and a drive unit. The valve mechanism includes a first control valve body driven by a drive unit to open and close an outflow opening portion, a hydraulically actuated valve body for opening and closing an inflow opening portion by a pressure difference, and a second control valve body driven by the drive unit through the first control valve body. When a first drive energy is input to the drive unit, the second control valve body maintains a seated state on the hydraulically actuated valve body. When the second drive energy is input to the drive unit, the second control valve body is unseated from the hydraulically actuated valve body. According to the seating and unseating of the second control valve body, a flow channel area of a communication passage for communicating an upper control chamber portion with a lower control chamber portion is switched to another.

A fuel injector for an internal combustion engine is disclosed. The fuel injector is particularly suitable for use as a dual fuel injector, and comprises a generally tubular outer valve needle, an inner valve needle slidably received in the outer valve needle, and a nozzle body assembly comprising a tip part and a needle guide part. The tip part defines a seating region for the outer valve needle, and the needle guide part comprises a guide bore for slidably receiving the outer valve needle. In one embodiment, a lower bore region of the needle guide part defines a cavity around the outer valve needle which houses a biasing spring for the outer valve needle and a fuel. A collar for seating the biasing spring can be dimensioned to allow free flow of the fuel from the cavity into an annular accumulator volume defined between the outer valve needle and the bore of the tip part.

A fuel injection controller includes a discharge switch that turns ON/OFF energization of a first energization path from a boost power source of a second booster circuit when a second control IC energizes a second solenoid, a first detection element that detects a value that depends on an energization state of the discharge switch, a constant current switch that turns ON/OFF energization of a second energization path from a power source voltage that outputs a lower voltage than a boost power source voltage when the second control IC energizes the second solenoid, a second element that detects a value that depends on an energization state of the constant current switch, and an energization path controller that switches energization to the second solenoid.

A filter for filtering hydraulic fluid in a hydraulically actuated fuel injector. The filter includes a first disc structure and a second disc structure disposed axially spaced apart from the first disc structure. The second disc structure is also disposed parallel to the first disc structure. The filter further includes an intermediate structure extending from the first disc structure to the second disc structure. The intermediate structure includes a first surface and a second surface disposed opposite and parallel to the first surface. The intermediate structure defines a plurality of passages extending from the first surface to the second surface. Each of the plurality of passages is perpendicular to a longitudinal axis of the filter.

The invention relates to a fuel injection valve for the intermittent injection of fuel into the combustion chamber of an internal combustion engine having a housing which has a high pressure chamber and a low pressure chamber. In addition, the fuel injection valve has a control chamber which is divided by means of a control valve into a first and a second control chamber. The control valve in turn has a valve guide and a valve insert, wherein an outflow throttle which connects the first control chamber to the second control chamber is arranged in the valve guide. According to the invention, the connection which is formed by way of the outflow throttle between the first control chamber and the second control chamber can be interrupted temporarily in a targeted manner.