Patent attributes
In a control apparatus for an electric vehicle, an input power operation quantity that reduces the difference between a target value of a system voltage and a detected value of the voltage is computed, and a duty ratio of a rectangular waveform applied to an inverter is set at a value that changes the input power of a MG unit by the input power operation quantity. The phase of the rectangular waveform is set at a value that suppresses torque variations caused by the duty ratio as variations of a torque generated by the AC motor. 3-phase voltage command signals are computed on the basis of the phase and the duty ratio and supplied to the inverter. In this way, variations in system voltage can be suppressed by controlling the input power of the AC motor, while sustaining the torque generated by the AC motor unchanged.
