Patent ID: 8655534

Claim:
An assisting force control device adapted for use in a bicycle including an electric motor and a crankshaft, said assisting force control device comprising: a driving member to be coupled co-rotatably to the crankshaft; a strain sensor disposed on said driving member, and operable to output a response signal corresponding to a deformation amount of said driving member; a torque calculation unit coupled to said strain sensor for calculating and outputting a torque signal according to the response signal; a rotational speed detection unit to be mounted on the crankshaft and operable to output a rotational speed detecting signal based on a rotational speed of the crankshaft; and a control unit including a receiving module for receiving the rotational speed detecting signal and the torque signal from said rotational speed detection unit and said torque calculation unit, respectively, and a processing module coupled to said receiving module for generating a force control signal to control the electric motor according to the rotational speed detecting signal and the torque signal.