Patent ID: 7957930

Claim:
An angle sensing device for sensing a rotating angle of a steering wheel from a datum point, the angle sensing device externally connecting with a power supply and receiving a first electric power from the power supply for sensing, the angle sensing device comprising: a sensing unit for sensing the rotating angle of the steering wheel and outputting a sensing signal, based on the rotating angle; a processing unit for determining, based on the sensing signal, a number of loops of the steering wheel rotating from the datum point and a relative angle in a single loop corresponding to the datum point; and for calculating, based on the number of loops and the relative angle in the single loop, the rotating angle; and a storage unit for receiving and storing the number of loops and the relative angle in the single loop; wherein when the steering wheel rotates across the datum point, the sensing signal outputted by the sensing unit presenting a non-continuous status, and the processing unit determining, based on the presenting times of the non-continuous status, the number of loops.