A fuel conduit connection assembly for interconnecting fuel system components of an internal combustion engine (ICE) system. The fuel conduit connection assembly includes a mounting structure for fastening a portion of the assembly to an ICE external structure; a fuel receiving conduit portion having a plurality of inlet fuel duct connections for connecting to a plurality of corresponding fuel channels of a fuel system component outside the ICE external structure, respectively; a single fuel feeding conduit portion for connecting to a fuel system component internal the ICE external structure; and a sealing arrangement arranged on an outer circumferential surface of the assembly and configured to provide sealing between a first environment and a second environment in an assembled state with the ICE external structure.

An electronically controlled fuel injection device that achieves reduced component count, simplified construction, and cost reduction while promoting discharge of vapor that is generated in a pressurizing chamber. With a fuel passage from a fuel intake pipe into a pressurizing chamber and a return passage that is a discharge passage for vapor generated in the pressurizing chamber, and a plunger with a prescribed reciprocating operation having a standby position set as a position enabling fuel supply and vapor discharge, the electronically controlled fuel injection device eliminates the need for an inlet check valve and promotes the discharge of vapor that is generated when fuel is supplied from the fuel intake pipe to the pressurizing chamber.

A connector that is in a fuel supply system capable of supplying a high-pressure fuel, and may reduce pulsation in a low-pressure pipe with a simple structure and extend the life of a mold is provided. A valve of the connector includes a valve seat contact surface and a tapering through hole. The valve seat contact surface axially separates from an annular valve seat and forms a forward-direction flow path due to pressure of the low-pressure fuel when the high-pressure fuel does not flow in reverse, and may come into contact with the annular valve seat when the high-pressure fuel flows in reverse. The tapering through hole is formed farther radially inward than the valve seat contact surface, forms an orifice flow path having a smaller cross-sectional area than the forward-direction flow path, and allows a reverse flow of the high-pressure fuel when the high-pressure fuel flows in reverse.

A high pressure fuel pump includes: a pump body that forms a suction passage and a pressurizing chamber and slidably supports a plunger; and a control valve that opens a connection between the suction passage and the pressurizing chamber in a suction stroke, during which the plunger is driven toward a suction side for suctioning fuel into the pressurizing chamber, while the control valve controls closing timing, at which the connection between the suction passage and the pressurizing chamber is closed by the control valve in a delivery stroke, during which the plunger is driven toward a delivery side for delivering the fuel out of the pressurizing chamber. The pump body forms a release passage that is communicated with the suction passage. The release passage relieves the fuel, which is pressurized by the plunger, from the pressurizing chamber before the closing timing during the delivery stroke.

A fuel injector includes an injector housing, an outlet check, an injection control valve assembly, and a valve seat orifice plate integrating a valve seat and various orifices for outlet check control. In the valve seat orifice plate a drain orifice extends between a valve seat surface and a check control chamber formed between a closing hydraulic surface of the outlet check and the valve seat orifice plate. First and second re-pressurization orifices extend between an outer surface of the valve seat orifice plate and the check control chamber.

A flow control system for a fuel injector of an internal combustion engine includes: an inlet channel, an outlet channel, a return channel for returning pressurized fuel to a low-pressure system having a lower pressure than the inlet channel, a fuel outlet chamber, a moveable nozzle control member in the fuel outlet chamber for selectively allowing the pressurized fuel to flow into the outlet channel, a biasing member biasing the nozzle control member towards a closed position, a moveable member defining, with the nozzle control member, a fuel control chamber configured to bias the nozzle control member towards its closed position, a moveable valve member for selectively opening and closing a flow passage and a fuel connection between the inlet channel and the fuel control chamber for pressurizing the fuel control chamber.

The flexibility of the attachment angle and attachment interval of the member (e.g., injector) attached to the joint member is increased to improve the flexibility of layout even in the case of the forged rail for high-pressure direct injection. In addition, the manufacturing cost can be reduced while keeping high strength of the joint portion. A rail body 1 manufactured by forging, the rail body 1 having a through hole 4 opened on a wall surface 3 for communicating a fuel passage 2 extending in an axial direction with an outside; and a tubular joint member 6 manufactured separately from the rail 1 body and fixed to the rail body 1 at a position of the through hole 4 for allowing a fuel to flow from the fuel passage 2 through the through hole 4 are provided.

A monolithic fuel rail structure is configured to receive and support a fuel injector, and includes a log, an injector cup that protrudes integrally from an outer surface of the log, and a fuel passage. An inner surface of the log defines a main fuel channel, and the injector cup includes a bore that opens at one end of the injector cup. An inlet end of the fuel injector is received in the bore. The fuel passage provides fluid communication between the bore and the main fuel channel, and the fuel passage corresponds to a portion of a hole that extends through the injector cup on each of opposed sides of the injector cup.

A fuel injection system includes a first high pressure fuel source, a return channel connected to a second low pressure fuel source, a residual pressure regulator having an inlet and an outlet connected to the return channel, and a fuel injector having a control valve arrangement comprising an inlet, an outlet and a return port, a fuel injection nozzle having an outlet chamber, an injection outlet, and a needle member in the outlet chamber. The needle member is biased to a closed position to block fluid communication between the outlet chamber and the injection outlet, and to open fluid communication by a pressure in the outlet chamber. The residual pressure regulator is connected to a spill valve to regulate pressure to a residual pressure higher than the pressure in the return channel and lower than the pressure of the first fuel source.

A fuel injection valve includes a nozzle, a housing, a needle, and a throttle portion. The nozzle includes an injection hole through which fuel is injected and a valve seat formed around the injection hole. The nozzle includes an injection hole through which fuel is injected and a valve seat formed around the injection hole. The housing has a fuel flow path through which the fuel to the injection hole flows. One end of the needle is configured to open and close the injection hole by being separated from the valve seat or abutted on the valve seat. The throttle portion is provided upstream with respect to the valve seat in a fuel flow direction.