| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a charging rate estimation device capable of restraining degradation in the estimation accuracy of the charging rate of a battery even if a current sensor has an error in offset of current detection. <P>SOLUTION: The charging rate estimation device for a battery includes: charging/discharging current detecting means 3 and terminal voltage detecting means 2 for the battery 1; a Kalman filter 4 for estimating an open voltage such that the charging/discharging current is used as a control input signal and a terminal voltage is used as an observation signal; correction charging rate estimation means 5 for estimating a correction charging rate SOCB from the open voltage estimated by the Kalman filter 4; charging/discharging detection current correction means 6 for correcting a charging/discharging current detected by the charging/discharging current detecting means 3 based on the correction charging rate estimated by the correction charging rate estimating means 5; and charging rate calculating means 12 for calculating a charging rate by dividing an integrated value, obtained by integrating charging/discharging currents corrected by the charging/discharging current detecting means, by a full charging capacity. <P>COPYRIGHT: (C)2012,JPO&INPIT |
