Device and method for controlling vehicle

A control device for a vehicle incorporating a main power supply, a first sub power supply, a second sub power supply, a selection portion allowing selection of any one sub power supply of said first and second sub power supplies, a first converter boosting a DC voltage supplied from said main power supply, a second converter boosting a DC voltage supplied from one sub power supply selected by said selection portion, and a rotating electric machine serving as a drive source and receiving electric power supply from said first and second converters, comprising:

• an electronic control unit, the electronic control unit further comprising:
• a request detection unit;
• a boost control unit;
• and
• a selection control unit,
• the electronic control unit programmed to detect a change request for changing said one sub power supply to the other sub power supply with the request detection unit;
• the electronic control unit programmed to set, when said change request is detected and when a target boost voltage of said first and second converters is lower than a predetermined value, said predetermined value as the target boost voltage and to control said first and second converters such that set said target boost voltage is attained, with the boost control unit;
• and
• the electronic control unit programmed to control said selection portion so as to satisfy said change request after said predetermined value is set as the target boost voltage with the selection control unit,
• wherein said predetermined value being a value for maintaining such a state that a voltage of said first converter on a side of the rotating electric machine is higher than at least a voltage of said main power supply when skid of wheels of said vehicle occurs.