A power-assisted bicycle shifting system based on the pedal position

Abstract

The invention relates to a booster bicycle gear shifting system with a pedaling position as a judgment basis. The booster bicycle gear shifting system with the pedaling position as the judgment basis comprises a power module, a microcomputer, a gear shifting driver and a pedal position sensing module, wherein the pedal position sensing module is used for angle position of at least a crank; the microcomputer has a gear shifting operation logic; before performing gear shifting control, the microcomputer carries out the gear shifting operation logic; the process comprises the steps of: (1) when the angle position of the at least one crank passes through a first angle position, reducing an output boosting force of a motor to a first boosting force value; (2) when the angle position of the at least one crank after leaving the first angle position passes through a pedaling dead point, reducing the output boosting force of the motor to the minimum; (3) carrying out gear shifting; (4) after the gear shifting, controlling the output boosting force of the motor and restoring the output boosting force to the size before the step (1).

Description

technical field [0001] The present invention is related to the shifting system of the power-assisted bicycle, in particular to a shifting system of the power-assisted bicycle based on the judgment of the pedaling position. Background technique [0002] Existing power-assisted bicycles are powered by a microcomputer-controlled motor when the rider is pedaling, and no power is provided when the rider is not pedaling, which can make it easier for the rider to pedal without reducing the pedaling and riding Multiply the fun. When riding a power-assisted bicycle, its microcomputer will judge whether the motor should be controlled to change the output power according to the terrain, speed or gear, that is, the power provided by the motor will change due to the control of the microcomputer when riding. [0003] Existing power-assisted bicycles usually also have an automatic shifting function, which usually puts a shifting logic in the microcomputer, and when the shifting condition ...

AI Technical Summary

Problems solved by technology

[0004] However, in traditional power-assisted bicycles, since the rider is still pedaling during the gear shifting process, the microcomputer will consider it to be in a normal state due to the pedaling action and then control the motor to output a full amount of power assistance.

This full power boost combined with the pedaling force of the rider will cause the transmission to change the gear ratio during the shifting process and cause the problem of uneven bite. What's more, it may cause the chain to break or the transmission to be damaged.

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