蓄電デバイスの残存容量演算装置

Remaining capacity computing device for electricity accumulating device

Abstract

【課題】電流積算に基づく残存容量における誤差の累積を低減する共に、開放電圧に基づく残存容量における負荷変動の影響を低減し、常に安定した高精度な残存容量を求める。 【解決手段】開放電圧に基づく残存容量SOCVと、電流積算に基づく残存容量SOCIとの容量差に基づいて電流誤差IDを算出する。そして、電流誤差IDを用いて電流センサで計測した電流値IBを補正するための電流補正値IDFを算出し、この電流補正値IDFにより電流センサで計測した電流値IBを補正して電流推定値ISを求め、この電流推定値ISを用いて算出した残存容量SOCV,SOCIをバッテリの使用状態に応じて重み付けして合成し、最終的な残存容量SOCを算出する。これにより、電流積算に基づく残存容量における誤差の累積と、開放電圧に基づく残存容量における負荷変動の影響とを低減し、常に安定した高精度な残存容量を求めることができる。 【選択図】図2
<P>PROBLEM TO BE SOLVED: To always attain the stable and precise remaining capacity by reducing the affection from load variation in the remaining capacity, on the basis of the open voltage, as well as reducing the integrated error in the remaining capacity on the basis of current integration. <P>SOLUTION: On the basis of the difference between the remaining capacity SOCV based on the open voltage, and the remaining capacity SOCI based on the current integration, the current error ID is calculated. By using the current error ID, the current correction value IDF is calculated for correcting the current value IB measured by using the current error ID with a current sensor, the current estimation value IS is obtained by correcting the current value IB measured by the current sensor by the current correction value IDF. The final remaining capacity SOC is obtained by the weighted composition of the remaining capacity SOCV and SOCI, corresponding to the service condition of the battery by using the current estimation value IS. Thereby, the integration of the errors in the remaining capacity on the basis of the current integration and the affection of the load fluctuations in the remaining capacity based on the open voltage are reduced. Consequently, remaining capacity of high precision can be always and stably obtained. <P>COPYRIGHT: (C)2006,JPO&NCIPI

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