| 摘要 |
When a car is moved, a current and a voltage from a battery change and a power-supply voltage of a sub-battery is not lower than a manipulation level, an approximately linear function is obtained according to a current from a buttery and a terminal voltage, and residual capacity is displayed according to the approximately linear function. When the car is stopped and the current and the voltage of the battery do not change, the residual capacity is obtained according to the voltage. Moreover, when a power source supplying control circuit judges that an ignition is turned off, a voltage of the power source is lowered to the manipulation level so as to be supplied for prescribed time required for the battery becoming constant.
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