Electrically assisted cycle kit

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.

主权项

1. An electrically assisted cycle kit for fitting to a pedal cycle to convert the pedal cycle into an electrically assisted pedal cycle, the electrically assisted cycle kit comprising:
an electric motor for assisting pedal cycle motion of the pedal cycle; a battery for powering the electric motor; a gear tooth sensor for providing a gear motion signal indicative of at least one of (i) a speed of motion of gear teeth and valleys of an existing rear sprocket of the pedal cycle relative to the gear tooth sensor, said existing rear sprocket not provided in said electrically assisted cycle kit, and (ii) an acceleration of motion of the gear teeth and valleys of the existing rear sprocket of the pedal cycle relative to the gear tooth sensor; and a controller for controlling a drive of the electric motor in dependence on the gear motion signal provided by the gear tooth sensor.