Bicycle Derailleur Voltage Control for Shifting Precision
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Solution Overview
Problem
Current bicycle derailleurs lack efficient mechanisms for smooth and controlled gear shifting, particularly in varying voltage and power supply conditions, which can lead to inconsistent performance and increased power consumption.
Innovation Solution
A bicycle derailleur system comprising a base member, a movable member, a motor unit, and a controller that adjusts voltage and power supply based on gear position and power source levels to optimize shifting operations, allowing for different maximum voltages and power levels during shifting directions, and incorporates over-stroke modes for enhanced shifting precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a motor unit is used to move the movable member for gear shifting, then the gear shifting automation is improved, but the power consumption increases
Solution Approach 1:
The controller dynamically adjusts the motor unit's operating parameters including maximum voltage and power levels based on the shifting direction and remaining power source levels, making the system adaptable to varying operational conditions and power availability
Solution Approach 2:
The system changes operational parameters (voltage, power levels) of the motor unit based on shifting direction and power source status, optimizing performance while managing power consumption across different operating states
2Measurement precision
If different maximum voltages are applied during different shifting directions, then the gear shifting precision is improved, but the device complexity increases
Solution Approach 1:
Different maximum voltage levels are applied to specific shifting directions based on operational requirements, with higher voltage for one direction and lower voltage for the opposite direction, optimizing precision for each shifting scenario
Solution Approach 2:
The controller monitors the shifting operation and power source levels to determine appropriate voltage levels, using feedback from the system state to adjust motor unit parameters for optimal shifting precision
3Use of energy by moving object
If voltage and power levels are adjusted based on remaining power source levels, then the power consumption efficiency is improved, but the control complexity increases
Solution Approach 1:
The controller continuously monitors remaining power source levels and adjusts motor unit voltage and power levels accordingly, using feedback from power source status to optimize power consumption efficiency
Solution Approach 2:
The system dynamically adapts its power consumption characteristics based on real-time power source availability, changing operational parameters to match remaining power levels and extend system operation
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 system enables smoother and more precise gear shifting, reduces power consumption by adjusting voltage and power levels according to the remaining power source levels, and facilitates efficient chain movement across sprockets using over-stroke regions.
Implementation Method 1
The motor unit is configured to move the movable member relative to the base member between the first gear position and the second gear position
Data Source
AI summary
A bicycle derailleur comprises a base member, a movable member, a motor unit, and a controller. The controller is configured to control the motor unit to rotate an output shaft of the motor unit at a first maximum voltage during a first shifting operation of the chain in a first shifting direction. The controller is configured to control the motor unit to rotate the output shaft of the motor unit at a second maximum voltage during a second shifting operation of the chain in a second shifting direction. The first maximum voltage is different from the second maximum voltage. The bicycle derailleur is configured to receive electricity from an electric power source configured to supply electricity to an assist driving unit.