The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 07, 2020
Filed:
Feb. 01, 2016
Hitachi Automotive Systems, Ltd., Hitachinaka-shi, Ibaraki, JP;
Ryo Kusakabe, Hitachinaka, JP;
Takatoshi Iizuka, Hitachinaka, JP;
Takao Miyake, Hitachinaka, JP;
Masashi Sugaya, Hitachinaka, JP;
Kiyotaka Ogura, Hitachinaka, JP;
Shirou Yamaoka, Hitachinaka, JP;
HITACHI AUTOMOTIVE SYSTEMS, LTD., Hitachinaka-Shi, JP;
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 bodyunder 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 bodythat can open and close a fuel passage, a needlethat activates an opening and closing valve by transmitting power between itself and the valve body, and an electromagnet that comprises a solenoidand a fixed coreprovided as drive means for the needle, and a cylindrical nozzle holderdisposed on the outer peripheral side of the needle; and the drive devicecontrols a drive current flowing to the coil so as to decrease from the maximum drive current to a first drive currentthat is lower than the maximum drive current before the valve bodyreaches the maximum height position so that the valve bodyreaches a height position lower than the maximum height position.