| 摘要 |
PROBLEM TO BE SOLVED: To measure the remaining capacity of a battery with accuracy even when a power source is turned off. SOLUTION: This device is provided with a display part 1 with three lamps, a display control part 2 to control the lightening and flashing, etc., of the lamps at the display part 1, a remaining capacity determining part 3 to determine remaining battery capacity on the basis of the voltage value of a battery 12, a voltage measuring module 9 to measure the voltage of the battery 12, and a current measuring module 7 to measure a motor current to a motor 11. In addition, the device is provided with the motor 11 to drive an electric motor vehicle and a motor controller 5 to control the motor 11. Furthermore, the remaining capacity determining part 3 is provided with a power-on time determining means 3D to determine that remaining battery capacity is smaller than the value based on the first conversion chart with respect to each voltage value based on the first conversion chart at the time of the start of power supply from the battery. |
