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:
Sep. 04, 2001
Filed:
Nov. 24, 2000
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
Means for estimating the charged state of a battery, capable of accurately estimating an SOC even though the battery repeats charging/discharging in short cycles. The charging/discharging current Ib measured by current sensing means (,) is integrated, and pseudo-SOC estimating means estimates a pseudo-SOC. Electromotive force estimating means (,) estimates the open voltage Voc from the pseudo-SOC. Voltage change estimating means (,) estimates the voltage change Vr due to the internal resistance from the charging/discharging current Ib. Dynamic voltage change estimating means (,) estimates the voltage change Vdyn due to the change of the charging/discharging current. An adder (,) adds the Voc, Vr, and Vdyn to calculate an estimated voltage Vest of the battery. SOC correction calculating means (,) calculates the correction of the SOC for equalizing the estimated voltage Vest to the measured voltage Vmes measured by voltage sensing means (,), and an adder (,) adds the correction to the pseudo-SOC to estimate the SOC of the battery.