| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection control device capable of accurately controlling a fuel injection quantity.SOLUTION: In a fuel injection valve, a needle valve 30 for opening and closing an injection hole 28 is biased to an injection hole 28 side by a first spring 71, and a movable core 60 provided reciprocably relative to the needle valve 30 is biased to the injection hole 28 side by a second spring 72. A fuel injection control device for controlling this fuel injection valve, when performing a fuel injection, first supplies to a coil, as pre-energization, an electric current generating magnetic attraction force which is larger than the biasing force of the second spring 72 and is smaller than the valve closing force of the needle valve 30. Subsequently, the fuel injection control device, after performing the pre-energization, supplies to the coil an electric current generating magnetic attraction force which is larger than the valve closing force of the needle valve 30. With this, collision force between the movable core 60 and a needle flange 31 is reduced by the pre-energization, and therefore bounce when the needle valve is fully lifted is suppressed. |
