| 摘要 |
<P>PROBLEM TO BE SOLVED: To estimate the remaining amount of the battery without using a current sensor based on the discharge current value and the voltage value. <P>SOLUTION: The duty ratio corresponding to grip opening Th is set to a duty map 48 beforehand and a current value when energizing to a motor 18 by the voltage value decided by the duty ratio is set to discharge current map 49. A remaining capacity map 51 is set to output the remaining battery capacity based on the current value retrieved from the discharge current map 49 and the measured voltage value. The full charge amount as the reference value to calculate the remaining capacity is sets beforehand as a discharge power amount when the discharge voltage when the battery 4 is discharged by the prescribed current value is the prescribed discharge end voltage. A remaining capacity map 51 sets the value subtracted the estimated power amount based on the voltage input actually to the motor 18 and the current value calculated by the discharge current map 49 at that time from the amount of the full charge as a remaining battery capacity. <P>COPYRIGHT: (C)2013,JPO&INPIT |
