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:
Jan. 26, 2021
Filed:
Mar. 27, 2019
Hitachi Automotive Systems, Ltd., Hitachinaka, JP;
Ryo Kusakabe, Hitachinaka, JP;
Motoyuki Abe, Mito, JP;
Hideharu Ehara, Yokohama, JP;
Tohru Ishikawa, Kitaibaraki, JP;
Takuya Mayuzumi, Hitachinaka, JP;
Kenji Hiraku, Kasumigaura, JP;
HITACHI AUTOMOTIVE SYSTEMS, LTD., Hitachinaka, JP;
Abstract
In a drive unit of a fuel injection device, an electric current is supplied to the fuel injection device by applying a high voltage to the fuel injection device from a high voltage source whose voltage is boosted to a voltage higher than a battery voltage at the time of opening a valve of the fuel injection device. Thereafter, the electric current supplied to the fuel injection device is lowered to a current value at which a valve element cannot be held in a valve open state by stopping the applying of the high voltage from the high voltage source. Thereafter, in a stage where a supply current is switched to a hold current, another high voltage is applied to the fuel injection device from the high voltage source.