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:
Feb. 15, 2011
Filed:
Nov. 29, 2007
Katsuaki Morita, Hiroshima-ken, JP;
Masaya Mitake, Hiroshima-ken, JP;
Masahiro Yamaguchi, Hiroshima-ken, JP;
Hiroshi Yamashita, Hiroshima-ken, JP;
Masaomi Yamada, Hiroshima-ken, JP;
Kousuke Katahira, Hiroshima-ken, JP;
Katsuaki Morita, Hiroshima-ken, JP;
Masaya Mitake, Hiroshima-ken, JP;
Masahiro Yamaguchi, Hiroshima-ken, JP;
Hiroshi Yamashita, Hiroshima-ken, JP;
Masaomi Yamada, Hiroshima-ken, JP;
Kousuke Katahira, Hiroshima-ken, JP;
Mitsubishi Heavy Industries, Ltd., Tokyo, JP;
Abstract
Occurrence of overcharging and over discharging of batteries mounted on vehicles that travel on tracks in a wireless transit system is prevented by estimating a state of charge (SOC) of the batteries with accuracy. An equivalent circuit of the battery is composed of three circuit elements connected in series, including (i) a first component resistance R1 (ii) a component circuit which includes a capacitance C and a second component resistance R2 connected in parallel and (iii) an open circuit voltage of the battery. The open circuit voltage of the equivalent circuit is calculated using R1 calculated from measurements of current and voltage of the battery, as well as values k=R2/R1 and τ=C×R2. The SOC if the battery is calculated from the open circuit voltage.