Patent ID: 7453231

Claim:
An electric vehicle control device, which vector-controls an induction motor by an inverter device, the electric vehicle control device comprising: a vector control unit for calculating a q-axis current I 1 q, a d-axis current I 1 d, a q-axis voltage command E 1 qr, a d-axis voltage command E 1 dr, and an inverter angular frequency ωinv of the induction motor; a torque calculation unit for calculating the torque of the induction motor on the basis of the q-axis current I 1 q, the d-axis current I 1 d, the q-axis voltage command E 1 qr, the d-axis voltage command E 1 dr, and the inverter angular frequency ωinv; a torque variation width calculation unit for calculating the torque variation width from a maximum value and a minimum value of a torque calculation result in a predetermined time width on the basis of the torque calculation result that is calculated by the torque calculation unit; and a comparator for comparing the torque variation width that is calculated by the torque variation width calculation unit with a predetermined torque variation width reference value to output a disconnection detection signal when the torque variation width exceeds the torque variation width reference value.