Method and apparatus for proportionally assisted propulsion

Details Method and apparatus for proportionally assisted propulsion Method and apparatus for proportionally assisted propulsion

B - Operations, Transporting

62

M

B62M 6/50 (2010.01) B62M 6/45 (2010.01) B62M 6/60 (2010.01) B62K 11/00 (2006.01)

Patent

CA 2426109

A system for the proportional propulsion assistance comprising a strain gauge for the detection and measurement of a flexion of the hub of a rear wheel of a bicycle, wherein said gauge is placed on a vertical face of said hub; amplification means for amplifying a measurement signal coming from said gauge, a filter at the input of said amplification means; an analog to digital converter at the output of said amplification means; a digital processing circuit to digitize the signal at the output of said amplification means to compensate for any deviation of the said signal to calculate, in real time, the effort provided by the cyclist on the gears of the said hub and to control the assistance effort of the DC motor on the hub of the rear wheel of the bicycle to give a progressive assistance to the cyclist.

L'invention concerne un système de propulsion à assistance proportionnelle comprenant un extensomètre destiné à détecter et mesurer la flexion du moyeu de la roue arrière d'une bicyclette, cet extensomètre étant disposé sur une surface verticale dudit moyeu, une unité d'amplification servant à amplifier un signal de mesure provenant de l'extensomètre, un filtre situé à l'entrée de cette unité d'amplification, un convertisseur analogique-numérique installé à la sortie de ladite unité d'amplification, ainsi qu'un circuit de traitement numérique permettant de numériser le signal au niveau de la sortie de l'unité d'amplification de manière à compenser toute déviation dudit signal et à calculer, en temps réel, l'effort produit par le cycliste sur les pignons dudit moyeu, ce qui permet de réguler l'effort d'assistance du moteur c.c. sur le moyeu de la roue arrière de la bicyclette en vue de fournir une assistance progressive au cycliste.

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