| 摘要 |
An electric power steering device comprising a control unit (13) capable of distinguishing a failure of a motor current detection device caused by a change in power voltage, an oxide film formed on the commutator of a motor or the contact point of a relay, etc. from a failure of the motor current detection device (42) itself and judging a failure of the motor current detection device accurately. A motor current is sampled during which a predetermined constant voltage is supplied to the motor (10), and the detected motor current value is compared with a motor current estimated value to judge the failure of the motor current detection device.
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