Abstract: An electromagnetic fuel injector of an internal combustion engine having a plurality of electromagnetic coils for valve driving wound separately on a bobbin in an axial direction. The bobbin has a step difference of the outer diameter so that the bobbin outer diameter in the region with the second coil to be wound thereon is smaller then the bobbin outer diameter in the region with the first coil to be wound thereon, and the bobbin inner diameter has a step difference in that the bobbin inner diameter in the region with the first coil to be wound thereon is made large partially so as to secure an annular space to interpose a seal ring therein.

Abstract: In an electromagnetic fuel injector of an internal combustion engine, an electromagnetic coil for valve driving is to be wound on a bobbin, and the bobbin is constituted by a synthetic resin containing a filler having good heat conductivity. For example, the bobbin with the coil to be wound thereon is constituted by PPS containing iron oxide and/or alumina as a filler. Two types of electromagnetic coils different in characteristics are provided in the fuel injector. These coils are wound separately on one bobbin in an axial direction. Among them, one coil (hereinafter referred to as “first coil”) has a winding region near a movable unit with a valve element being the object of magnetic suction, and other coil (hereinafter referred to as “second coil”) has a winding region away from the movable unit.

Abstract: The present invention provides a fuel injection valve including a stationary core and a movable core having one end opposed to one end of the stationary core, the movable core being movable toward the one end of the stationary core upon magnetization of the stationary core and a valve on the other end of the movable core and movable with the movable core, the valve being supported by a valve seat base and a cylindrical body extends from at least the stationary core to the base.

Abstract: A fuel injection apparatus including a controller to output an injection time command signal and an opening movement time command signal to command an opening movement time from a closed state to an open state of an electromagnetic fuel injection valve and a control circuit, coupled to the controller, to change an electric current flowing in a coil of the electromagnetic fuel injection valve between when the electromagnetic fuel injection valve is closed and opened. The controller sends both the injection time command signal and the opening movement time command signal through the same signal line to the control circuit.

Abstract: To realize spraying that is asymmetrical in the flow rate distribution of a sprayed fuel in order to improve the homogeneity of air-fuel mixture density during the air intake stroke injection for homogeneous combustion in an in-cylinder injection engine. By providing the exit portion of the fuel injection hole with the wall surfaces 204a, 204b, 205a, and 205b that are parallel to the central axis of the injection hole, further providing the periphery of the injection hole with an plurality of areas in which the flow of the fuel in the radial direction of the injection hole will be restrained, and an plurality of areas in which the flow of the fuel in the radial direction of the injection hole will not be restrained, and assigning a different size to each non-restraint area.

Abstract: An electromagnetic fuel injection valve in an engine injects fuel by opening/closing a fuel flowing path with a valve element. A controller controls opening/closing of the fuel flowing path and changes magnetic force generated by a control coil driving the valve element so that the magnetic force is less during a valve open state-holding period than at an initial valve-opening time. The controller detects the voltage of a battery and applies the voltage fed from the battery to the control coil, while changing a time interval (Tc), for which current is passed through the control coil, based on the detected voltage, in order to change the magnetic force, without raising the voltage from the battery. The controller also detects increase/decrease of a pressing force on the valve element caused by fuel pressure and changes the time interval (Tc) accordingly.

Abstract: An electromagnetic fuel injection valve in an engine injects fuel by opening/closing a fuel flowing path with a valve element. A controller controls opening/closing of the fuel flowing path and changes magnetic force generated by a control coil driving the valve element so that the magnetic force is less during a valve open state-holding period than at an initial valve-opening time. The controller detects the voltage of a battery and applies the voltage fed from the battery to the control coil, while changing a time interval (Tc), for which current is passed through the control coil, based on the detected voltage, in order to change the magnetic force, without raising the voltage from the battery. The controller also detects increase/decrease of a pressing force on the valve element caused by fuel pressure and changes the time interval (Tc) accordingly.

Abstract: Using a cycling type fuel injection valve, form a concentrated spray area and a thin spray area, adjust the position of those, and conform the spray to the geometric shape of engine and mounting position of the fuel injection valve so as to reduce the fuel consumption and control the unburnt component in exhaust gas. The fuel injection valve is so constructed to form a step on the injection hole opening of the fuel injection valve, to have two or more edge transition portions of the injection hole opening, resulting from the step, and to cause the line connecting the edge transition portions to form an oblique angle against the wall formed by the step perpendicular to the injection hole center axis and the angled wall.

Abstract: The present invention provides a fuel injection valve comprising a stationary core and a movable core having one end opposed to one end of the stationary core, the movable core being movable toward the one end of the stationary core upon magnetization of the stationary core and a valve on the other end of the movable core and movable with the movable core, the valve being supported by a valve seat base and a cylindrical body extends from at least the stationary core to the base.

Abstract: In an electromagnetic fuel injection valve for injecting fuel by opening/closing a fuel flowing path, including a valve seat, a valve element for opening/closing the fuel flowing path formed between the valve seat and the valve element, and a drive unit having at least one coil, for driving the valve element. The drive unit includes a first magnetomotive force generating device using the at least one coil and a second magnetomotive force generating device, the first magnetomotive force generating device and the second magnetomotive force generating device being composed so that the first magnetomotive force generating device generates and raises magnetomotive force at a larger rate of change in time in comparison with the second magnetomotive force generating device. A valve opening hold state is held by the second magnetomotive force generating device which uses a smaller current flow in comparison with the first magnetomotive force generating device.

Abstract: A fuel swirling means 15 for giving a swirling force at the upper stream of the valve sheet 7 to the fuel passing through the surrounding area of the valve body 13 and a nozzle 16 injecting a swirling fuel are provided. A fuel spray 47 injected out from the injection port 17 of the nozzle 16 is so formed that the orientation of the fuel spray is deflected in a definite direction on the basis of the longitudinal axis C of the fuel injection valve body, the reachable distance L1 of the fuel spray at the deflected side is longer and the reachable distance L2 of the fuel spray at another side opposite to the deflected side is shorter.

Abstract: An electromagnetic fuel injection valve for injecting fuel by opening/closing a fuel flow path, includes a valve seat, a valve element for opening/closing the fuel flow path formed between the valve seat and the valve element, and a drive unit having at least one coil for driving the valve element. The drive unit includes a first magnetomotive force generating device using the at least one coil and a second magnetomotive force generating device, the first magnetomotive force generating device and the second magnetomotive force generating device being composed so that the first magnetomotive force generating device generates and raises its magnetomotive force at a larger rate of change in time in comparison with the second magnetomotive force generating device. A valve open state is held by the second magnetomotive force generating device which uses a smaller current flow in comparison with the first magnetomotive force generating device.