Provided is an electric power assist device for bicycles, which can achieve proper power assist control in response to the pedaling force without any complicated feature for detecting pedaling forces and any necessity of modification to a bicycle. The device comprises: a pedaling force estimator 154 configured to estimate a pedaling force put on each pedal of a bicycle based on a variation between average current levels I flowing in an electric motor 58 measured within a first crank rotational angle range A and a second crank rotational angle range B which is different from the first crank rotational angle range; and a crank rotational angle adjuster 152 configured to adjust the first crank rotational angle range A and the second crank rotational angle range B according to the gradient of a road on which the bicycle is traveling.
ELECTRIC ASSISTANCE DEVICE, AND BICYCLE
ELEKTRISCHE ASSISTENZVORRICHTUNG UND FAHRRAD
DISPOSITIF D'ASSISTANCE ÉLECTRIQUE ET BICYCLETTE
2023-08-16
Patent
Electronic Resource
English
Electric bicycle assistance controlling method and assistance controlling system
European Patent Office | 2023
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