| 摘要 |
PROBLEM TO BE SOLVED: To accurately detect voltage level of a battery in a situation where a device not constant in power consumption of a mechanism, a motor mechanism or the like is used. SOLUTION: Voltage of the battery is measured while the device is not operated (steps S402-S403), and when the measured voltage is larger than a low level, a voltage value by arithmetic average is calculated to determine the voltage level (steps S406-S408). Voltage is successively measured while applying voltage from the battery to a load circuit, and a predicted voltage is calculated from the measured voltage and the voltage measured in step S402 (steps S409-S413). The voltage level is determined based on the calculated predicted voltage (step S414). The lowest level of the voltage level determined in step S408 and the voltage level determined in step S414 is determined as a current voltage level (step S418). COPYRIGHT: (C)2009,JPO&INPIT
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