A bicycle electric power assist device includes: an electric motor connected in a torque transmitting relationship to a crank arm or a crankshaft driven by a pedal force; a battery; a control unit configured to control operation of the electric motor; a rotation angle sensor configured to detect a crank rotation angle position of the crankshaft; and a current sensor configured to detect a motor current, wherein the control unit includes: a pedal force estimation/calculation unit configured to estimate the pedal force of the pedals from a difference between the motor current in a first crank rotation angle position and the motor current in a second crank rotation angle position which is different from the first crank rotation angle position; and a motor drive control unit configured to control a drive current of the electric motor according to the pedal force estimated by the pedal force estimation/calculation unit.


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    Title :

    Bicycle electric power assist device and bicycle


    Contributors:

    Publication date :

    2023-10-24


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B62M RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES , Antrieb von Radfahrzeugen oder Schlitten durch den Fahrer / H02K Dynamoelektrische Maschinen , DYNAMO-ELECTRIC MACHINES



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