Patent ID: 7808194

Claim:
A control apparatus for an electric vehicle comprising: a conversion means that converts a voltage supplied by a DC power supply into a system voltage appearing on a power supply line; an MG unit that includes an inverter connected to the power supply line and drives an AC motor; a current control means for controlling a torque of the AC motor and an input electric power to the MG unit independently from each other; a system voltage control means for executing a system voltage stabilization control to control the input electric power to the MG unit so as to suppress variation in the system voltage by sending to the current control means a command value for controlling the input electric power; a conversion power control means for executing conversion power control to control a conversion power, which is an input electric power or an output electric power of the conversion means, from the conversion means; a conversion voltage control means for executing conversion voltage control to control a voltage output from the conversion means; and a torque difference reduction control means for reducing a difference between a first estimated torque and a second estimated torque to zero substantially so that the torque of the MG unit is restricted from varying in a transient condition of controlling the input electric power to the MG unit, by calculating the first estimated torque of the AC motor based on a current flowing in the AC motor and calculating the second estimated torque of the AC motor based on a current related to torque control of the AC motor.