Electric automobile

摘要

An electric vehicle includes an inverter unit and an ECU. The inverter unit or the ECU includes a magnetic force estimator that estimates a magnetic force of a permanent magnet structure associated with a motor rotor of a motor unit. The inverter unit or the ECU may also include a determiner for the estimated magnetic force and an abnormalities-responsive motor drive limiter. The estimator is configured to estimate, according to a predefined rule, the magnetic force, based on at least two detection signals selected from a group consisting of a detection signal indicating a rotational frequency of the motor unit, a detection signal indicating a motor voltage of the motor unit and a detection signal indicating a motor current of the motor unit.

主权项

1. An electric vehicle comprising:
a synchronous motor unit configured to drive a wheel; an ECU which is an electronic control unit configured to perform general control of the vehicle; an inverter unit, the inverter unit including:
a power circuitry including an inverter configured to convert a DC power from a battery unit into an AC power used to drive the motor unit; anda motor control circuitry configured to control at least the power circuitry in accordance with control from the ECU; and a plurality of sensors including at least two sensors selected from a group consisting of a sensor configured to sense a rotational frequency of the motor unit, a sensor configured to sense a motor voltage of the motor unit and a sensor configured to sense a motor current of the motor unit; the inverter unit or the ECU including:
a magnetic force estimator configured to estimate, according to a predefined rule, a magnetic force of a permanent magnet structure associated with a motor rotor of the motor unit, based on at least two detection signals produced from the sensors that are selected from a group consisting of a detection signal indicating a rotational frequency of the motor unit, a detection signal indicating a motor voltage of the motor unit and a detection signal indicating a motor current of the motor unit.