Patent ID: 7586278

Claim:
A control apparatus for an electric vehicle having an AC motor, comprising: a power converter that converts a voltage supplied by a DC power supply into a system voltage appearing on a power supply line; a target voltage setting unit that sets a target value of the system voltage; a voltage detector that detects the system voltage; a motor driving unit that includes an inverter connected to the power supply line and the AC motor driven by the inverter; a motor controller that controls the AC motor by changing electrical conduction of the AC motor; a power operation quantity calculator that computes a power operation quantity of an input power of the motor driving unit on the basis of a value set by the target voltage setting unit as the target value and a value detected by the voltage detector as the system voltage; and a system voltage controller that, using the computed power operation quantity, executes control of suppressing variations in the system voltage through adjustment of the input power of the motor driving unit by controlling at least one of a duty ratio and a phase of a rectangular waveform representing an electrical conduction state of the AC motor.