| 摘要 |
A motor-driven vehicle (30) includes a drive wheel (46) mount on a vehicle body (32). An electrical drive wheel driving unit (90), a battery (82), and a control unit (88) for controlling the driving unit are disposed within the drive wheel. A transmitter (98) unit is disposed on the vehicle body and includes at least light-emitting diode disposed close to the drive wheel to transmit a light signal to a receiver unit (86) disposed on the drive wheel. The receiver unit includes a plurality of phototransistors (T1-T8) disposed close to the transmitter unit, equidistantly along a circle concentric with the axle of the drive wheel. The phototransistors rotate with the drive wheel. The spacing between adjacent ones of the phototransistors is so determined that at least one phototransistor is within a light signal detectable range. The driving unit includes a gear (72) secured to the axle, plural pinions (80) rolling around the gear, and plural motors (76) having respective shafts (78) coupled to associated ones of the pinions. A manual-driving-force sensing unit (50) is mounted on a handlebar (42) of the vehicle, which generates a control signal in accordance with the magnitude and direction of a manual driving force applied to the handlebar. The control signal is fed to the control unit through the transmitter and receiver units. <MATH> <MATH> |
