| 摘要 |
A vehicle electric power steering system comprises a torque sensor including a torsion bar that detects a steering force applied to the steering wheel. A first rotation angle detection device detects a rotation angle of a steering shaft connected to the torsion bar, and a second rotation angle detection device detects a rotation angle of a pinion shaft connected to the torsion bar. A steering controller detects an abnormality in an output of the torque sensor. The steering controller detects the steering torque in place of the torque sensor based on the rotation angle of the steering shaft and the pinion shaft when an abnormality of the torque sensor is detected.
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