Patent ID: 8536809

Claim:
A vehicle electric drive motor-control device for executing vector control of an electric drive motor for vehicle, the control device comprising: a controller that generates a motor drive signal of vector control for the motor in accordance with a required drive torque; and an inverter that controls electrical power supplied from a battery as an electrical power source to the motor in accordance with the motor drive signal; wherein the controller is configured to judge whether the battery needs to be warmed up in accordance with an output of a battery temperature sensor that senses a temperature of the battery, and when judging that the battery needs to be warmed up, in situation (i) where the vehicle is stopped, set a q-axis current value for vector control of the motor at zero, or when a brake is released from such a situation (i), set a q-axis current at a value corresponding to a drive torque required to do a vehicle creep operation, and additionally set a d-axis current at a value required to do a battery warm-up operation; the controller further is configured to, when the battery needs to be warmed up in situation (ii) where the vehicle is running, set a q-axis current at a value corresponding to a drive torque required to do a vehicle running operation and additionally set a d-axis current at a value of promoting the battery warm-up operation in relation to the q-axis current value; and wherein, in said situations (i) and (ii), the controller is configured to perform setup so that the d-axis current value increases with a decrease in the battery temperature.