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:
Jun. 14, 2011
Filed:
Dec. 12, 2006
Yoshiaki Machiyama, Fukaya, JP;
Yoshiaki Machiyama, Fukaya, JP;
Shin-Kobe Electric Machinery Co., Ltd., Tokyo, JP;
Abstract
A battery state judging method is provided capable of properly judging a state of a lead-acid battery by measuring voltages without measuring currents. A state of the battery is judged by obtaining, in advance, a DC internal resistance rof a same type battery in a new and fully-charged state; calculating, in advance, a load R [R=r×Vst/(OCV−Vst)] at an engine starting time (S) from an open-circuit voltage OCV(S) and a lowest voltage Vst(S) at the engine starting time, both measured when the loaded battery is in a new and fully-charged state, and the DC internal resistance r; calculating a DC internal resistance r [(r=R/(OCV−Vst)/Vst)] of the loaded battery from an open-circuit voltage OCV (S) and a lowest voltage Vst (S), both measured when the loaded battery is in a deteriorated/insufficiently-charged state, and the load R; and comparing r and r.