| 摘要 |
A reference angle detecting device includes a control shaft connected to a controlled object, an electric motor causing the control shaft to rotate via a worm gear mechanism, a stopper disposed on a motion track of a worm wheel, an angle sensor that can detect a rotation angle of the control shaft, and a controller. The stopper includes a spring member which is elastically deformable in an operation direction of the worm wheel. The controller drives the electric motor to operate so that the worm wheel may face the stopper, and stores the rotation angle at a time point when a change rate omega of the rotation angle theta detected by the angle sensor changes to a value less than a predetermined threshold omega1 as a reference angle theta0. Therefore, the reference angle can be detected with high accuracy for control of an angle of the control shaft.
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