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:
Feb. 11, 2014
Filed:
Feb. 01, 2012
Shigeki Yamada, Hitachinaka, JP;
Takuya Mayuzumi, Hitachinaka, JP;
Mitsuhiko Watanabe, Odawara, JP;
Ayumu Hatanaka, Naka, JP;
Shigeki Yamada, Hitachinaka, JP;
Takuya Mayuzumi, Hitachinaka, JP;
Mitsuhiko Watanabe, Odawara, JP;
Ayumu Hatanaka, Naka, JP;
Hitachi Automotive Systems, Ltd., Hitachinaka-shi, JP;
Abstract
An injector drive circuit including: a step-up circuit generating a high voltage from a power supply; a first switching device connected to a path between the step-up circuit and an injector; a second switching device connected to the power supply; a third switching device connected between the injector and the ground; and a control unit operating the first, second and third switching device according to a value of current flowing through the injector; wherein the control unit has a unit turning on and off the second switching device in a period during which it turns on and off the first switching device a plurality of times; wherein the control unit has, as set values to control the current flowing through the injector, a first threshold defining a lower current limit, a second threshold defining an upper current limit and a third threshold, larger than the second threshold.