Chainless E-Bike Speed Control for Natural Pedaling Feel
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electric bicycles with chain drive systems have complex structures, especially in E-CARGO vehicles with three to four wheels, which complicates the drive system and increases the number of chains and gears.
Innovation Solution
A chainless drive system that converts pedal force into electricity and transmits it to the wheels without a chain, using a speed control device with a speed sensor, current sensor, wheel speed control unit, and pedal torque control unit to mimic the driving feel of a conventional bicycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a chain drive system is used to connect pedals and drive wheels, then the driving force can be transmitted effectively, but the structure becomes complex especially in E-CARGO vehicles with three to four wheels
Solution Approach 1:
The patent removes the chain drive system from the E-CARGO vehicle, extracting the problematic component that caused structural complexity. The generator is directly coupled to the pedal assembly, eliminating the need for chains, gears, and other mechanical transmission components while maintaining effective driving force transmission through direct electrical power generation.
Solution Approach 2:
The patent replaces the mechanical chain drive system with an electrical power generation system. The generator converts mechanical energy from pedal movement directly into electrical energy, which then powers the drive wheels through an electrical motor, substituting mechanical transmission with an electromechanical system that simplifies the overall drive train.
2Device complexity
If the chain is eliminated and pedal force is converted to electricity, then the drive system structure is simplified, but the driving feeling may differ from conventional bicycles
Solution Approach 1:
The patent incorporates a control system that provides feedback to maintain the desired driving feeling. Sensors detect pedal input and vehicle operation conditions, and the controller adjusts generator torque and motor assistance levels to replicate the natural cycling experience while maintaining the simplified chainless structure.
Solution Approach 2:
The patent dynamically adjusts operational parameters such as generator torque, motor assistance level, and power distribution to maintain the desired driving feeling. By changing these parameters in real-time based on sensor input, the system replicates the natural progression of pedal effort and vehicle response that cyclists expect.
3Adaptability or versatility
If multiple chains and gears are used in E-CARGO vehicles, then the drive system can handle the complexity of three to four wheel configurations, but the number of components increases
Solution Approach 1:
The patent creates a universal chainless drive system that can be applied to E-CARGO vehicles with two, three, or four wheels without requiring different chain and gear configurations. The electrical power generation and transmission system provides a single, adaptable architecture that works across all vehicle configurations, eliminating the need for multiple mechanical transmission components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The chainless drive system simplifies the structure, allowing it to be applied to various small vehicles with three to four wheels while providing a driving experience similar to conventional bicycles, and meets electric bicycle regulations.
Implementation Method 1
a driving force of the pedal is converted into electricity, and the electricity is transmitted to the wheels without the chain
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention relates to electric bicycle speed control device and method. According to the present invention, a torque of a motor for driving a wheel is controlled so that a speed of a pedal driven by a user follows a speed of the wheel, and a torque of the pedal is also controlled by applying an assist level according to the torque of the motor. Therefore, even in an electric bicycle with a chain, it is possible to feel a feeling of the pedal like a bicycle with a chain, and it is possible to adjust the force applied to the pedal according to the assist level.