Patent ID: 7447580
Filing Date: 2008-11-04
Classification: B62D,G01D

Abstract:
1. A method for measuring an absolute steering angle of a steering shaft for a vehicle using a first rotatable body and a second rotatable body that rotate together with the steering shaft of the vehicle at a predetermined rotation ratio, respectively, the method comprising: obtaining a measured angle Ψ calculating a plurality of relative rotational angles θ′s of the second rotational body that correspond to the Ψ obtaining a frequency i of the first rotatably body by comparing the plurality of θc′s to the θ obtaining an absolute rotational angle Ψ of the first rotatable body by using the i, and obtaining an absolute rotational angle Φ obtaining an absolute steering angle Φa of a steering shaft that corresponds to the Ψ if a difference between the Φ