Electrically-powered vehicle and method of controlling the same

摘要

An inverter performs bidirectional DC/AC power conversion between a power line and a second MG so as to control an output torque of the second MG for generating vehicle driving force. A PM-ECU sets a torque command value of the second MG such that requested driving force for an entire vehicle is exerted on a drive shaft. An MG-ECU estimates, based on a rotation speed of the second MG, a magnitude of a drag torque acting as rotational resistance when the second MG rotates at zero torque, and stops the inverter in accordance with a difference between the estimated drag torque and the torque command value.

主权项

1. An electrically-powered vehicle comprising:
an electric motor configured to output a torque to a drive shaft mechanically coupled to a driving wheel; a first power converter for controlling the torque output from said electric motor; and a control device for setting a torque command value of said electric motor such that requested driving force for an entire vehicle is exerted on said drive shaft, said control device including an electric motor control unit for estimating, based on a rotation speed of said electric motor, a magnitude of a drag torque acting as rotational resistance when said electric motor rotates at zero torque, and stopping said first power converter when the estimated magnitude of said drag torque is substantially the same as said torque command value.