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. 11, 2011
Filed:
Mar. 08, 2007
Yoshiaki Machiyama, Fukaya, JP;
Keizo Yamada, Honjyo, JP;
Yoshifumi Yamada, Fukaya, JP;
Takashi Hara, Honjyo, JP;
Yoshiaki Machiyama, Fukaya, JP;
Keizo Yamada, Honjyo, JP;
Yoshifumi Yamada, Fukaya, JP;
Takashi Hara, Honjyo, JP;
Shin-Kobe Electric Machinery Co., Ltd., Tokyo, JP;
Abstract
A battery state determining apparatus is provided which can accurately determine a state of a lead battery in an automotive vehicle. The apparatus calculates a corrected engine starting voltage Vstfrom an open-circuit voltage (OCV) measuring section that measures the open circuit voltage Vst of the lead battery at an engine starting time in accordance with a temperature of the vehicle. The apparatus further calculates a battery determination voltage Vst_th representing a voltage of the lead battery at an engine starting time when a growth rate of internal resistance of the lead battery reaches a predetermined value from the open-circuit voltage OCV. The apparatus then determines the battery state of the lead battery by determining whether the corrected engine starting voltage Vstis larger than the battery determination voltage Vst_th and whether the corrected engine starting voltage Vstbelongs to a predetermined region on a characteristic map.