| 摘要 |
When a steering angle speed (V.theta.), a rate of change of a steering angle with respect to time is not higher than a predetermined stop threshold level (Vb) (YES at S10) with a motor current value (Im) within a motor stop range (.DELTA.I), which is determined on the basis of a no-load current value, for a predetermined period of time (YES's at S12 and S13), a motor is stopped (S14). Since the no-load current value is a value recorded when the steering torque is zero, the motor stop range corresponds to a range in which steering assistance is not required. Namely, when both the steering angle speed (V.theta.) and steering torque are small, the steering assistance is regarded as unnecessary, and the motor is stopped.
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