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. 02, 2003
Filed:
Nov. 13, 2001
Tsutomu Matsuki, Nishikamo-gun, JP;
Toshihiro Katsuda, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
Frequency of judgment of welding of relays is increased to increase likelihood of early detection of welding. It is determined that a battery is not being recharged or discharged when a vehicle speed V of an electric vehicle is approximately 0 and a brake pedal is pressed, and a switching element of an inverter is controlled to be switched to discharge electric charges which are stored in a capacitor After discharging, relays are turned off, and voltages RV RV between the terminals of the relays are detected by voltmeters to judge whether either of the voltages RV RV has a threshold value RVref (approximate value 0) or less. When it is so determined, it is judged that the relays are welded, and an LED is illuminated.