Patent ID: 6152250
Filing Date: 2000-11-28
Classification: B60L,B62M

Abstract:
A power driving control system adapted to be incorporated in a bicycle having an electrical motor mechanically coupled to wheels of the bicycle and comprising a derailleur system so as to allow variation of a ratio between (a) a rotational speed of one of the wheels of the bicycle; and (b) a rotational speed of a crank axle which is driven by pedals by being actuated by a rider's feet, the electrical motor being powered by a power supply controlled by said power driving control system, said power driving control system comprising:first speed detection means for detecting the rotational speed of the crank axle and generating a first speed signal;second speed detection means for detecting a rotational speed of the wheel of the bicycle and generating a second speed signal; anda controller which receives the first speed signal and the second speed signal and determines a speed ratio of the second speed signal to the first speed signal, from which the controller generates an output signal which is applied to control the power supply to the motor so as to regulate mechanical power output from the motor to the bicycle, whereinwhen said speed ratio is small, a first amount of power is supplied to said electrical motor to forcibly assist moving the bicycle,when said speed ratio becomes large, a second amount of power relatively smaller than the first amount is supplied to said electrical motor.