Derailleur Battery Threshold Control to Prevent High-Load Pedaling
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Solution Overview
Problem
Bicycle derailleurs with low battery remaining capacity struggle to shift gears effectively, leading to high-load pedaling as depleted batteries fail to move the chain, making it difficult for riders to adjust gear positions, resulting in inefficient energy expenditure.
Innovation Solution
A method that determines the remaining battery capacity and invalidates the highest gear position when it falls below a certain threshold, preventing the derailleur from shifting to high gear and ensuring the derailleur remains in a usable gear position, thus avoiding high-load pedaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the derailleur allows shifting to high gear positions, then the rider can achieve higher speeds and better performance, but when battery capacity is low, the derailleur fails to shift properly causing high-load pedaling and rider exhaustion
Solution Approach 1:
The system proactively prevents high gear shifting when battery capacity is low by comparing remaining capacity against a threshold value. When the threshold is exceeded, the control unit blocks shifting commands for high gear positions, preventing the harmful effect of incomplete shifting and high-load pedaling before it occurs
Solution Approach 2:
The system continuously monitors battery capacity and provides feedback to the control unit. Based on this feedback, the control unit dynamically adjusts gear position availability, disabling high gear positions when capacity is insufficient and re-enabling them when capacity is restored, creating a closed-loop control system
2Reliability
If the derailleur restricts gear positions when battery capacity is low, then high-load pedaling is avoided, but the rider loses access to high gear positions needed for maintaining speed
Solution Approach 1:
The system dynamically adjusts the available gear positions based on real-time battery capacity conditions. High gear positions are conditionally enabled or disabled according to whether the battery capacity exceeds the threshold, allowing the system to adapt its functionality to current operational conditions
Solution Approach 2:
The control unit changes the operational parameters of the derailleur by modifying which gear positions are accessible. When battery capacity is sufficient, all gear positions are available; when capacity drops below the threshold, high gear positions are restricted, effectively changing the system's operational characteristics based on energy availability
Data Source
AI summary
A method for controlling a derailleur in low battery remaining capacity includes determining whether a remaining capacity of a first battery of the derailleur is smaller than or equal to a first derailleur battery threshold. When the remaining capacity of the first battery is determined to be smaller than or equal to the first derailleur battery threshold, at least one of gear positions of the derailleur is invalided and non-selectable by the derailleur.