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:
Nov. 04, 1997
Filed:
Jul. 11, 1995
Nippondenso Co., Ltd., Kariya, JP;
Abstract
A normal-direction mode which switches on first and fourth switches and in a mutually diagonal relationship of an H-type bridge circuit and switches off second and third switches also in a mutually diagonal relationship of the bridge circuit is executed for an on-duty time of an opening-degree command signal, and a reverse-direction mode which switches off the first and fourth switches and switches off the second and third switches is executed for an off-duty time of the opening-degree command signal. During normal operation, conduction of current to the H-type bridge circuit 70 and a coil is constantly performed irrespective of a degree of opening of a valve to be adjusted, and in a case where conduction is interrupted, it can be presumed that a broken wire has occurred in the H-type bridge circuit or coil, and determination of a broken wire can be made.