Bicycle speed change system and speed change method for power-assisted bicycle comprising same

Abstract

The invention discloses a bicycle speed change system. By integrating a stepless speed change mechanism into a central system of a power-assisted bicycle, the current riding state is judged by a controller according to sensor information, the speed reducing ratio of manpower and a motor to a rear wheel of the bicycle is automatically adjusted, and thus, the driving motor can operate nearby a rated operation point; an efficient operation area and a torque output range of the central system are broadened, the endurance mileage is prolonged, and the cost of a power-assisted bicycle system is reduced; the central system can automatically judge the whole bicycle operation state according to the bicycle speed, the human foot treading frequency, the foot treading force and the treading direction, and the current power assist rate is automatically adjusted; and operation is easier, more convenient and more humanized, and speed change gears do not need to be adjusted manually.

Description

technical field [0001] The invention belongs to the design field of power-assisted bicycle speed change mechanisms, and in particular relates to a speed change system for bicycles and a speed change method for power-assisted bicycles including the system. Background technique [0002] Power-assisted bicycles, also known as power-assisted electric bicycles, are a riding tool between bicycles and electric vehicles. They provide the kinetic energy needed for bicycles through electric power to assist manpower. The product of an environmentally friendly lifestyle. The central system is the core component of power-assisted bicycles. It integrates torque detection, controller modules, and motor drives to control the normal driving of the vehicle. At present, power-assisted bicycles are more popular in foreign markets, such as Germany, Japan and other developed countries. In my country, electric bicycles still occupy the main market, and most electric bicycles are driven by wheel h...

AI Technical Summary

Problems solved by technology

However, the external transmission systems currently on the market, whether they are hub-type internal transmissions or external flywheel systems, are expensive, complicated to install and debug, and need to be adjusted by the riders themselves according to different road conditions. Rarely know how to adjust the transmission system, usually ride in one gear all the time, it is difficult to achieve the purpose of speed change

[0005] At present, some companies use the gear transmission method to realize the two-stage speed change system, but the two-stage speed change system is a step-by-step speed regulation, and the rider can clearly feel the frustration brought by the speed change during the speed change.

And because of the size and space problem, generally the number of shifting stages cannot be many steps, and the shifting range is narrow

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