| 摘要 |
An electrically assisted cycle kit 50 for fitting to a pedal cycle 2 comprises an electric motor 58 for assisting pedal cycle motion, a battery 52 for powering the motor 58, and a controller 60 for controlling the drive of the motor 58. A gear tooth sensor 65 provides a gear motion signal indicative of the speed/acceleration of motion of gear teeth 94 and valleys 95 of a gear sprocket 32 of the cycle. The controller controls the drive of the motor 58 in dependence on the gear motion signal.
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