Control apparatus of electric vehicle

Abstract

A control apparatus of an electric vehicle in which relays are switched to a disconnecting state without causing failure of the electric vehicle. Main relays Ry1, Ry2 switchable between a connecting state and a disconnecting state are provided between a drive motor 11 for driving driven wheels and a motor drive battery 34 for supplying current to the drive motor 11. When these main relays Ry1, Ry2 are to be switched to the disconnecting state, it is determined whether or not the output current I from the motor drive battery 34 is below a predetermined current and whether or not the vehicle speed V is below a predetermined speed. When it is determined that the output current I is below the predetermined current and the vehicle speed V is below the predetermined speed, the main relays Ry1, Ry2 are switched to their disconnecting states. By this means it is possible to prevent welding failure of the main relays Ry1, Ry2 and to protect an invertor 36 and high-voltage auxiliaries 58 from an induced voltage of the drive motor 11.

Dependencies are inferred from the claim text.