| 摘要 |
An electric power steering device controls an electric motor through a program processing based on a steering torque detected by a torque sensor and a vehicle speed detected by a vehicle speed sensor, and applies a suitable assisting force to rotational motion of a steering handle. Occurrence of an abnormality in the torque sensor and a power circuit is detected through the program processing. The torque sensor is activated upon receipt of a power-supply voltage from the power circuit and detects a steering torque. If a power-supply voltage outputted from the power circuit has dropped, detection of an abnormality in the torque sensor is forbidden. If a power-supply voltage supplied from a battery to the power circuit has dropped, detection of an abnormality in the power circuit is forbidden.
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