Electric vehicle control device

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 I1q, a d-axis current I1d, a q-axis voltage command E1qr, a d-axis voltage command E1dr, 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 I1q, the d-axis current I1d, the q-axis voltage command E1qr, the d-axis voltage command E1dr, 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.