Electric power assisted bicycle

Details Electric power assisted bicycle Electric power assisted bicycle

1995-06-07

1998-09-15

Boehler, Anne Marie

Motor vehicles

Special wheel base

Rider propulsion with additional source of power, e.g.,...

180207, 180220, 180 658, 180 685, B62M 2302

Patent

active

058066217

ABSTRACT:
A secondary battery generates an assisting force for a bicycle. When the voltage of the battery drops, a driver can physically feel a variation in driving feeling to indicate a reduction in battery capacity and to also indicate the amount of capacity remaining. The variation in driving feeling is an increase in force required to pedal the bicycle. In other words, when charging is required, the assisting force which assists pedaling by human power will be reduced. A voltage drop detector compares data obtained by A/D conversion of the voltage of a battery with certain reference voltages set in advance and outputs voltage drop detection signals. When the voltage drop detection signal is received by an assisting force variation control, a variation assisting force is output to warn the user that battery charge is low. The variation assisting force is obtained by reducing or varying almost to zero an assisting force calculated by an assisting force calculator. A PWM signal producer outputs a PWM signal in response to the assisting force or the variation assisting force to drive a motor of the bicycle.

REFERENCES:
patent: 4694236 (1987-09-01), Upadhyay et al.
patent: 5226501 (1993-07-01), Takata
"Yamaha's PAS Power-Assisted Bicycle" Automotive Engineering vol. 101 No. 12, Dec. 1993, p. 33.

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