| 摘要 |
A power assist apparatus of a power assisted bicycle comprises a crank shaft to be driven for rotation by a pedaling force, an electric motor for generating an assisting power, a force composition device for composing the pedaling force and the assisting power to output a composed force thereof to a driving wheel side and at the same time for generating two thrust component forces having magnitude proportional to pedaling force and assisting power, a thrust component force magnitude difference detection means for detecting the difference in magnitude between the two thrust component forces, and a control means for controlling an output of the electric motor so as to bring the difference in magnitude between the two thrust component forces to "0" and to an optional magnitude difference based on an input from the thrust component force magnitude difference detection means. <IMAGE> |
