Driving unit and battery-assisted bicycle

摘要

A driving unit and a battery-assisted bicycle include a stopping assist control without making a rider feel uncomfortable. The driving unit includes a crankshaft to which pedals are to be connected, a torque detector that detects a torque generated at the crankshaft, and an assist control stopping unit that stops an assist control based on an amplitude of a torque detected by the torque detector while the crankshaft rotates in a prescribed rotation angle range.

主权项

1. A driving unit that assists a rider's pedaling effort, the driving unit comprising:
an electric motor configured to provide a driving force to assist the rider's pedaling effort; a crankshaft to which pedals are to be connected; a torque detector configured to detect a torque generated at the crankshaft by the rider's pedaling effort; and an assist control stopping unit programmed to stop an assist control provided by the driving force from the electric motor based on an amplitude of the torque detected by the torque detector while the crankshaft rotates over a prescribed rotation angle range; wherein the assist control stopping unit includes:
a torque amplitude calculator that calculates an amplitude of the torque, the amplitude of the torque being defined as a difference between a maximum value and a minimum value of the torque detected by the torque detector over the prescribed rotation angle range; andan assist stop determination unit that determines to stop the assist control if the amplitude of the torque obtained by the torque amplitude calculator is equal to or less than a predetermined threshold.