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:
Oct. 01, 2013
Filed:
Aug. 14, 2008
Hisayoshi Nakata, Hitachinaka, JP;
Masahiro Sasaki, Hitachinaka, JP;
Takuya Mayuzumi, Hitachinaka, JP;
Mitsuhiko Watanabe, Odawara, JP;
Ryoichi Oura, Hitachinaka, JP;
Hisayoshi Nakata, Hitachinaka, JP;
Masahiro Sasaki, Hitachinaka, JP;
Takuya Mayuzumi, Hitachinaka, JP;
Mitsuhiko Watanabe, Odawara, JP;
Ryoichi Oura, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
According to the present invention, the operation of a diagnostic circuit within a load drive circuit, which has been built into an electronic control device, is checked without modifying the electronic control device or the like. The load drive circuit, which drives a load such as a solenoid using a DC power supply as a power supply, includes a drive circuit and a diagnostic circuit which is independently provided within the drive circuit. Upon input of a drive-stop signal from a control circuit that controls the drive circuit, the operation of at least the drive circuit stops, so that whether the diagnostic circuit, which diagnoses the condition of the load, is normally operating or not is checked in a condition in which the load drive circuit has been built into the electronic control device.