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AssigneeHitachi Automotive Systems, Ltd.
InventorsRyo Kusakabe, Takatoshi Iizuka, Takao Miyake, Masashi Sugaya, Kiyotaka Ogura, Shirou Yamaoka
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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. The present invention is a drive device for a fuel injection device for use in an internal combustion engine, wherein: the fuel injection device is provided with a valve body 214 that can open and close a fuel passage, a needle 202 that activates an opening and closing valve by transmitting power between itself and the valve body 214, and an electromagnet that comprises a solenoid 205 and a fixed core 207 provided as drive means for the needle 202, and a cylindrical nozzle holder 201 disposed on the outer peripheral side of the needle 202; and the drive device 150 controls a drive current flowing to the coil so as to decrease from the maximum drive current to a first drive current 610 that is lower than the maximum drive current before the valve body 214 reaches the maximum height position so that the valve body 214 reaches a height position lower than the maximum height position.
A drive device for a fuel injection device including a valve body, a valve seat portion having a seat surface on which the valve body sits, a needle driving the valve body, and a coil driving the needle by a drive current flowing thereto, the drive device for the fuel injection device comprising:
A drive device for a fuel injection device including a valve body, a valve seat portion having a seat surface on which the valve body sits, a needle driving the valve body, a fixed piece disposed to face the needle, and a coil driving the needle by a drive current flowing thereto, the drive device for the fuel injection device comprising:
A drive device for a fuel injection device including a valve body, a valve seat portion having a seat surface on which the valve body sits, a needle driving the valve body, a fixed piece disposed to face the needle, and a coil driving the needle by a drive current flowing thereto, the drive device for the fuel injection device controlling an injection amount of the fuel injection device comprising:
Dependencies are inferred from the claim text.