Electric Bicycle Assembly with Integrated Generator and Motor
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Solution Overview
Problem
Existing bicycle devices with integrated motors lack an efficient mechanism to generate electrical energy while allowing for both pedaling and motor-assisted propulsion, limiting their energy harvesting and usage efficiency.
Innovation Solution
A bicycle design featuring a first and second chain sprocket system, a generator that converts pedaling energy into electrical energy, and a motor for propulsion, with a stand mechanism for energy storage and efficient energy use, allowing for pedaling to charge batteries and using the motor for propulsion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a generator is added to harvest energy during pedaling, then energy generation capability is improved, but device complexity increases
Solution Approach 1:
The first chain sprocket is designed to serve dual functions: it transmits mechanical power to propel the bicycle during normal pedaling, and simultaneously drives the generator to generate electrical energy when the pedal assist mode is activated. This multi-functionality allows the system to harvest energy during pedaling without adding a completely separate mechanical transmission path, thereby improving energy generation capability while limiting the increase in device complexity.
Solution Approach 2:
The controller acts as an intermediary that manages the interaction between the pedaling mechanism and the generator. It detects when the rider is pedaling and automatically engages the generator through the chain sprocket system, coordinating the power flow between mechanical input and electrical output. This intermediary control mechanism enables seamless energy harvesting without requiring complex mechanical switches or clutches.
2Power
If a motor is added for propulsion assistance, then propulsion capability is improved, but device complexity increases
Solution Approach 1:
The motor is integrated into the bicycle's existing drivetrain system, sharing the same chain sprocket and chain mechanism used for manual pedaling. The motor can engage and disengage independently through electronic control, providing propulsion assistance when needed while remaining dormant during pure pedaling. This integration allows the motor to utilize existing mechanical components rather than requiring a separate propulsion system, improving propulsion capability with minimal increase in overall device complexity.
Solution Approach 2:
The system dynamically switches between different propulsion modes: pure pedaling, motor-assisted pedaling, and motor-only operation. The controller continuously monitors rider input and battery status, dynamically engaging or disengaging the motor and generator as appropriate. This dynamic operation allows the motor to provide propulsion assistance only when beneficial, optimizing power delivery while managing system complexity through intelligent control rather than mechanical complexity.
3Reliability
If both generator and motor are integrated into the bicycle, then energy self-sufficiency is improved, but device complexity increases
Solution Approach 1:
The generator and motor are merged into a single integrated power system that shares common mechanical components (chain sprockets, chains, and transmission path) with the bicycle's existing drivetrain. Both devices are controlled by a single controller that manages power flow between the rider's pedaling input, the generator, the battery, and the motor. This merging approach allows the system to achieve energy self-sufficiency by harvesting and storing energy during pedaling while using the motor for assistance when needed, all while minimizing device complexity by utilizing shared components rather than completely separate systems.
Solution Approach 2:
The controller implements feedback control by continuously monitoring the bicycle's operational state (pedaling speed, battery charge level, motor status) and automatically adjusting the engagement of the generator and motor accordingly. When the rider pedals, the controller detects this input and engages the generator to charge the battery. When additional propulsion is needed, the controller activates the motor using power from the battery. This feedback mechanism enables the system to autonomously manage its energy resources, achieving energy self-sufficiency through intelligent control rather than complex mechanical arrangements.
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
Enables efficient energy generation and storage during pedaling, allowing for extended motor-assisted riding while reducing energy consumption, and providing a versatile propulsion system that combines traditional pedaling with electric assistance.
Implementation Method 1
A generator is coupled to the bicycle and the generator is rotated to generate electrical energy when the pedals are pedaled
Implementation Method 2
The motor rotates the rear wheel when the motor is turned on for propelling the bicycle
Data Source
AI summary
An electric bicycle assembly for propelling a bicycle includes a bicycle that includes a first chain sprocket and pedals coupled to the first chain sprocket for rotating the first chain sprocket to propel the bicycle. A second chain sprocket is coupled to the first chain sprocket such that the second chain sprocket is rotated when the first chain sprocket is rotated. A generator is coupled to the bicycle and the generator is rotated to generate electrical energy when the pedals are pedaled. A motor is coupled to the bicycle and the motor is in mechanical communication with the rear wheel. The motor rotates the rear wheel when the motor is turned on for propelling the bicycle.