| 摘要 |
<P>PROBLEM TO BE SOLVED: To switch a relay to a disconnected state, without causing failures of electric vehicle. <P>SOLUTION: Main relays Ry1, Ry2 which switch to a connected state from the disconnected state, and vice versa, are incorporated between a drive motor 11 which drives a drive wheel and a battery 34 for driving which supplies electric current to the motor. When the main relays Ry1, Ry2 are switched to the disconnected state, it is decided whether the output current I from the battery 34 for driving is smaller than a predetermined current, and whether a vehicle speed V is lower than a predetermined vehicle speed. When it is decided that the output current I is smaller than the predetermined current and that the vehicle speed V is lower than the predetermined vehicle speed, the main relays Ry1, Ry2 are switched to the disconnected state, by which the welding failure of the main relays Ry1, Ry2 are prevented, and an inverter 36 and high-voltage system auxiliary equipment 58 are protected from the induced voltage of the drive motor 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
