Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
January 2, 2007
Patent Application Number
11339653
Date Filed
January 25, 2006
Patent Primary Examiner
Patent abstract
An electric power steering device comprising a control unit 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 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, 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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