Patent ID: 6621250
Filing Date: 2003-09-16
Classification: F02N,G01R,H02J,Y02T

Abstract:
A battery capacity measuring device, attached to a battery rechargeable by a generator, for measuring the present capacity of a battery according to an integrated value of charging/discharge current values of the battery detected by a current sensor, said battery capacity measuring device comprising:a fully-charged state judging means for detecting that a battery is fully charged; a detected current integrating means for integrating current values that are detected by said current sensor during a period from the instant the battery is fully charged to the instant it is fully charged later; a dividing means for dividing the integrated value of detected current values calculated by said detected current integrating means by the length of the period; and a correcting means for correcting a detected current using the quotient provided by said dividing means as an offset.