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:
Dec. 03, 2013
Filed:
Feb. 25, 2011
Kohei Onda, Hitachi, JP;
Ayumu Hatanaka, Tokai, JP;
Akira Mishima, Mito, JP;
Takuya Mayuzumi, Hitachinaka, JP;
Fumiaki Nasu, Hitachinaka, JP;
Mitsuhiko Watanabe, Odawara, JP;
Kohei Onda, Hitachi, JP;
Ayumu Hatanaka, Tokai, JP;
Akira Mishima, Mito, JP;
Takuya Mayuzumi, Hitachinaka, JP;
Fumiaki Nasu, Hitachinaka, JP;
Mitsuhiko Watanabe, Odawara, JP;
Hitachi Automotive Systems, Ltd., Hitachinaka-shi, JP;
Abstract
Disclosed is an electromagnetic valve driving circuit capable of reducing a load of a booster circuit. A boost driving FETis connected to a route formed between the booster circuitand a first terminal of an injector. A battery-side driving FETand a battery protection diode Db are connected to a route formed between a positive-polarity side of a power supply and the first terminal of the injector. A freewheeling diode Df is connected at a first terminal thereof to a portion between the first terminal of the injectorand the battery protection diode Db, and at a second terminal thereof to a grounding side of the power supply. An injector downstream-side driving FETis connected to a route formed between the second terminal of the injectorand the grounding side of the power supply. In addition to operating the FETs, andaccording to a level of a current which flows through the injector, a control circuitactivates the battery-side driving FETduring a period in which the boost driving FETrepeatedly turns on and off a plurality of times.