Electric automobile
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United States of America Patent
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Nov 10, 2015
Grant Date -
Dec 12, 2013
app pub date -
Feb 10, 2012
filing date -
Feb 25, 2011
priority date (Note) -
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status (Latency Note)
Importance
Abstract
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.
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