| 摘要 |
A power steering device that produces a steering assist force by a hydraulic pressure generated by a motor-driven pump, comprising a steering angle detecting section (11, S1, S4) which detects an absolute steering angle based on a steering mid-point and a relative steering angle, a first control section (31, S6, S8-S10) which starts the motor when an absolute steering angle detected by the steering detection section exceeds a first threshold value, and a second control section (31, S6, S11, S9, S10) which, while the steering angle detection section is not detecting an absolute steering angle, starts the motor when the change of a steering angle is larger than a second threshold value that is smaller than the first threshold value.
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