| 摘要 |
<p>The invention provides a motor-driven bicycle including an automatic gear shifter, which is capable of improving a shift feeling upon gear-shift and controlling a self-running power of a drive motor determined on the basis of an amount of a self-running operation by a driver as a function of a braking state and a vehicle speed. To achieve this, a motor-driven bicycle includes a drive motor M for generating a self-running power in response to a self-running operation by a driver, a gear shifter connected between the drive motor M and a drive wheel, and means for detecting a vehicle speed. This motor-driven bicycle further includes a self-running reference duty ratio map 201 for determining a self-running power to be generated by the drive motor M, that is, a duty ratio of an AC exciting current to be supplied to the drive motor M on the basis of an operated amount of a self-running operation by a driver, a gear step of the gear shifter, and a vehicle speed. In the self-running reference duty ratio map 201, a reference duty ratio Drefl of a drive current to be supplied to the drive motor M at the time of self-running is previously registered as a function of a throttle angleθth detected by a throttle opening sensor 15. <IMAGE></p> |
