Aisin Aw Co., Ltd.

Tomohiro Aritake

Yoshinobu Ito

A shift-by-wire system, connected to a manual shaft in a vehicle, includes: an electric motor having a rotary shaft which rotates the manual shaft; an angle-of-rotation sensor that detects angle position of the rotary shaft for control of the electric motor; a shaft position sensor that detects angular position of the manual shaft; and a control unit that, when the angle-of-rotation sensor functions normally, controls the electric motor according to the sensed angular position of the rotary shaft, so that the sensed angular position of the shaft comes within a predetermined range, and when the angle-of-rotation sensor does not function normally, initiates sensor-less control of the electric motor while estimating the direction of rotation of the rotation shaft, based on the sensed angular position of the shaft, and ceases sensor-less control when the sensed angular position is within the predetermined range.

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Anjo, Japan

Tomohiro Aritake