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:
Mar. 11, 2003
Filed:
Dec. 05, 2001
Shuji Satake, Shizuoka, JP;
Yazaki Corporation, Tokyo, JP;
Abstract
A vehicle battery's open circuit voltage estimating method and a system therefor for relatively correctly estimating an open circuit voltage of a battery on a vehicle within a relatively short period after completion of the charge or the discharge also without a temperature correction is provided. A disconnected voltage measuring means - measures a disconnected voltage of the battery multiple times in a definite period of time after a predetermined period of time after completion of charge or discharge of the battery. An approximate expression determining means - determines a power approximate expression having a negative power number by using a difference value of the measured disconnected voltage and an assumed open circuit voltage. And, an arithmetic operation controlling means - makes the approximate expression determining means update the assumed open circuit voltage and determine the power approximate expression repeatedly until the power number of the determined power approximate expression becomes −0.5 or about −0.5, and the assumed open circuit voltage is estimated to be the open circuit voltage when the power number becomes −0.5 or about −0.5.