Bicycle Transmission Control Device Dynamic Speed Adaptation
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Solution Overview
Problem
Existing bicycle transmission control devices lack the ability to optimally control operating speeds based on varying running speeds and gear ratios, leading to inefficient chain management and transmission responsiveness.
Innovation Solution
A bicycle transmission control device with a controller that adjusts operating speeds based on running speed and gear ratio, utilizing a memory to store related information and a table that changes boundaries depending on cadence, ensuring optimal control of multiple operating speeds across different conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the bicycle transmission control device uses a single operating speed for chain guidance, then the device structure is simple, but the transmission responsiveness and chain management efficiency deteriorate under varying running speeds and gear ratios
Solution Approach 1:
The patent implements dynamic control by adjusting the operating speed of the chain guide based on detected running speed and gear ratio conditions. The controller dynamically selects between a first operating speed and a second operating speed, making the system adaptive rather than static. This resolves the contradiction by allowing the system to optimize transmission responsiveness for different riding conditions without requiring a permanently complex multi-speed mechanism.
Solution Approach 2:
The patent changes the operating speed parameter of the chain guide based on detected running speed and gear ratio. By modifying this key parameter in response to varying conditions, the system achieves optimal transmission performance across different scenarios without permanently increasing structural complexity. The controller adjusts the speed parameter dynamically, resolving the contradiction between simplicity and responsiveness.
2Reliability
If the bicycle transmission control device adjusts operating speed based on running speed and gear ratio, then the chain guidance efficiency is improved, but the device complexity increases due to additional sensors and control logic
Solution Approach 1:
The controller serves multiple functions: it detects running speed, determines gear ratio, selects appropriate operating speeds, and controls the chain guide. By making the controller a multi-functional component rather than adding separate dedicated systems for each function, the patent improves chain guidance efficiency while minimizing the increase in overall device complexity.
Solution Approach 2:
The system uses its own operational data (running speed and gear ratio) to automatically adjust its chain guide operating speed. This self-service approach eliminates the need for external complex control systems or additional sensors beyond what is already required for basic bicycle operation, thereby improving reliability without proportionally increasing complexity.
3Measurement precision
If the bicycle transmission control device uses different operating speeds for different conditions, then the transmission control precision is improved, but the energy consumption increases due to frequent speed adjustments
Solution Approach 1:
The patent applies partial action by using two discrete operating speeds rather than continuous variable speed control. This approach achieves sufficient transmission control precision for different riding conditions without the excessive energy consumption that would result from frequent fine-adjustments. The system switches between two speeds based on detected conditions, providing adequate precision while minimizing energy waste.
Data Source
AI summary
A bicycle transmission control device comprises a controller configured to control an operating speed of a bicycle derailleur based on a running speed of a bicycle and a gear ratio of the bicycle.