| 摘要 |
PROBLEM TO BE SOLVED: To provide an operation device calculating internal resistance of a vehicular battery with high accuracy. SOLUTION: A plurality of pairs of voltage/current are collected between a cranking period during a starting period of a vehicular engine (201), a regression line is determined from the collected pairs of voltage/current, and an internal resistance value Rd is calculated by inclination to determine a pseudo open voltage (204). An open voltage differenceΔVo, i.e., the difference of the pseudo open voltage before and after starting of the engine is calculated (205) and the internal resistance value Rd is corrected based on the open voltage differenceΔVo (206). Thereby, the internal resistance can be highly accurately operated as compared with the case where the correction is not performed. COPYRIGHT: (C)2007,JPO&INPIT
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