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. 28, 2003
Filed:
Apr. 12, 2001
Satoshi Yoshimura, Kariya, JP;
Denso Corporation, Kariya, JP;
Abstract
An error such as disconnection or short on the current path from said dc power supply to a switching element via the dc motor is detected by judging whether variation in a voltage at a junction point between the dc motor and the switching element tracks variation in the pulse width modulation signal for the switching element. If this is false for a predetermined interval, this apparatus judges there is the error. The error is judged by variation in a voltage at a junction point between the dc motor and the switching element tracks variation in the pulse width modulation signal, so that though the dc motor is driven by a fan for cooling the engine of a motor vehicle because of wind due to traveling of a motor vehicle, the error can be judged accurately.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile