Abstract: Provided is a fuel injection device that sets an electromagnetic attraction force, which is generated in a magnetic gap between a magnetic core and a movable element, to more than or equal to a desired value. The fuel injection device includes a movable element that is attracted to the magnetic core and a housing provided opposite to the movable element in a direction orthogonal to an axial direction, wherein the movable element is configured so that an axial length of the movable element is 1.25 to 1.46 times as long as an axial length of the housing.

Abstract: An object is to suppress an inclination of a waveform indicating an injection quantity with respect to an injection pulse particularly when a lift amount of a valve body is small and an injection pulse width is short, thereby improving control accuracy of the injection quantity of a fuel injection device. Thus, a control device for controlling a fuel injection device, which includes a valve body, a solenoid, and a movable element to open the valve body, is provided with a control unit that controls a drive voltage or a drive current to be applied to the solenoid, in which the control unit controls the drive current such that the drive current to be supplied to the solenoid decreases from a maximum drive current after the maximum drive current is supplied to the solenoid and before the valve body starts to open.

Abstract: The purpose of the present invention is to provide a drive device that improves the precision of injection quantities by stabilizing the behavior of a valve body 214 under the condition that a valve body reaches a height position lower than a maximum height position and making the injection pulse width and the injection quantity gradient small.

Abstract: An object is to suppress an inclination of a waveform indicating an injection quantity with respect to an injection pulse particularly when a lift amount of a valve body is small and an injection pulse width is short, thereby improving control accuracy of the injection quantity of a fuel injection device. Thus, a control device for controlling a fuel injection device, which includes a valve body, a solenoid, and a movable element to open the valve body, is provided with a control unit that controls a drive voltage or a drive current to be applied to the solenoid, in which the control unit controls the drive current such that the drive current to be supplied to the solenoid decreases from a maximum drive current after the maximum drive current is supplied to the solenoid and before the valve body starts to open.

Abstract: A solenoid valve provided with a valve element that abuts against and separates from a valve seat to seal fuel; a movable iron core capable of being separated from the valve element; and a fixed iron core arranged opposed to the movable iron core. The solenoid valve also includes: a first spring member that energizes the valve element toward a side of the valve seat; a second spring member that energizes the movable iron core toward the fixed iron core; and a stopper part disposed on the side of the valve seat with respect to the movable iron core, and arranged with the movable iron core via a gap in a displacement direction in a valve closed state. The gap is set so the movable iron core collides with the stopper part when being displaced in the valve closing direction after the valve element is opened.

Abstract: A solenoid valve provided with a valve element that abuts against and separates from a valve seat to seal fuel; a movable iron core capable of being separated from the valve element; and a fixed iron core arranged opposed to the movable iron core. The solenoid valve also includes: a first spring member that energizes the valve element toward a side of the valve seat; a second spring member that energizes the movable iron core toward the fixed iron core; and a stopper part disposed on the side of the valve seat with respect to the movable iron core, and arranged with the movable iron core via a gap in a displacement direction in a valve closed state. The gap is set so the movable iron core collides with the stopper part when being displaced in the valve closing direction after the valve element is opened.

Abstract: The purpose of the present invention is to provide a drive device that improves the precision of injection quantities by stabilizing the behavior of a valve body 214 under the condition that a valve body reaches a height position lower than a maximum height position and making the injection pulse width and the injection quantity gradient small.

Abstract: To improve the accuracy of an injection amount by a fuel injection valve, the open/close operation of a valve body needs to be performed promptly. This requires a configuration in which, immediately after starting movement of a movable member, fluid force generated at a seat portion of the valve body is not transmitted. It is also required to suppress a cohesion phenomenon between an end surface of an anchor and an end surface of a fixed core and to prevent sticking. To solve this problem, an electromagnetic fuel injection valve has a configuration in which a valve body includes a second valve body configured to abut against an anchor at valve close, a first valve body that abuts against the anchor at valve open. The second valve abuts against a stroke stopper arranged on an inner periphery of a fixed core at a time of valve-open.