| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent a step up-down converter from resonating while driving an electric vehicle with demand driving force. <P>SOLUTION: When voltage step-up abnormality occurs, a target transmission stage is set based on a vehicle speed and a voltage step-up abnormality time transmission relation in which an Lo gear is set in a range where the vehicle speed is equal to or more than value 0 and less than a vehicle speed A, a Hi gear is set in a range where the vehicle speed is equal to or more the vehicle speed A and less than a vehicle speed B, the Lo gear is set in a range where the vehicle speed is equal to or more the vehicle speed B and less than a vehicle speed C, and the Hi gear is set when the vehicle speed is the vehicle speed or more. An inverter for driving a motor is controlled by a selected control mode and a transmission is controlled so that a transmission stage becomes a target transmission stage. This can prevent the number of revolutions of the motor from entering a resonance band while the electric vehicle travels at demand torque for traveling, and can prevent the step up-down converter from resonating. <P>COPYRIGHT: (C)2012,JPO&INPIT |
