| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery state monitoring device provided with the approximate expression calculation system and its method capable of calculating the approximate expression calculation system indicating the relationship between the battery terminal voltage and the elapsed time after finishing the charge or discharge which are precisely fitting to the actual measurement value. SOLUTION: A first and a second power approximate expressions V1(t) and V2(t) are obtained by sampling the terminal voltage at a first interval T1 of 30 to 60 minutes, and a second interval T2 of 60 to 90 minutes after IGN is off. From the obtained first and second power approximate expression, a third powerβ3 is obtained. From the obtained third power, an unknown constant numbersα3 and V(∞) in the expression V3(t)=α3×t<SP>β3</SP>+V(∞) are obtained. To the expression: V3(t)=α3×t<SP>β3</SP>+V(∞), the time t=24 hours is substituted, the terminal voltage V3(24 hours) of the battery after 24 hours is obtained. COPYRIGHT: (C)2009,JPO&INPIT
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