Patent ID: 9193380
Filing Date: 2015-11-24
Classification: B62D,G01D

Abstract:
1. A steering-shaft-rotation-angle detection device for detecting a rotation angle of a steering shaft that is rotated by operation of a steering wheel, the steering-shaft-rotation-angle detection device comprising: an electric motor that assists steering of the steering wheel by a driver; a speed reduction mechanism that reduces speed of rotation of the electric motor and transmits the rotation to the steering shaft; a rotating body that is attached to a rotation shaft of the electric motor; a signal output unit that outputs a signal in accordance with rotation of the rotating body; a reference-rotational-position detector that detects a reference rotational position of the steering shaft; and a controller that wherein the reference-rotational-position detector outputs a pulse of signal for every rotation of the steering shaft, and the controller sets, on the basis of the received pulse of signal that is output from the reference-rotational-position detector for a first time from a neutral position of the steering shaft, a preset reference rotation angle corresponding to this pulse of signal as the reference rotation angle of the steering shaft.