Servo Motor Bicycle Shifter Interface for Automatic Gear Control
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Solution Overview
Problem
Existing bicycle shifting technologies fail to provide a commercially successful, adaptable, and user-friendly automatic shifting system that accounts for rider biometrics, road conditions, and personal preferences, often requiring manual intervention and sacrificing robustness for cost or complexity.
Innovation Solution
A servo motor-based cable shifting apparatus with a microprocessor control system, incorporating bicycle speed and road inclination sensors, and a user-friendly interface that allows real-time adjustments to optimize pedaling rates and efforts, using a servo power actuation device with a high gearing ratio reducer and a comprehensive microprocessor-based control system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual sheathed cable actuation mechanisms are used for gear shifting, then the system is simple and reliable, but the rider must continuously intervene and cannot shift during stoppage
Solution Approach 1:
The patent replaces the manual mechanical cable actuation system with an electric motor-driven cable actuation system. The motorized actuator automatically adjusts the cable tension to shift gears based on sensor inputs (speed, cadence, power), eliminating the need for manual rider intervention while maintaining the reliability of cable-based actuation.
Solution Approach 2:
The system incorporates sensors that continuously monitor riding conditions (wheel speed, cadence, power output) and automatically trigger gear shifts without rider input. The control system processes this data and actuates the cable mechanism autonomously, allowing the system to serve itself by detecting when shifting is needed and executing the shift automatically.
2Adaptability or versatility
If automated shifting systems are implemented, then rider intervention is reduced, but the systems fail to adapt to individual rider biometrics and preferences
Solution Approach 1:
The system incorporates multiple sensors (wheel speed, cadence, power output) that continuously feed data back to the control system. This feedback loop allows the system to monitor actual riding conditions and rider performance in real-time, adjusting gear shifts dynamically to match the rider's biometrics, endurance level, and preferred cadence ranges.
Solution Approach 2:
The control system dynamically adjusts shifting parameters based on real-time sensor data rather than using fixed predetermined settings. The system adapts its behavior continuously during the ride, modifying shift thresholds and timing based on the rider's instantaneous power output, cadence preferences, and environmental conditions.
3Extent of automation
If complex mathematical or fixed criteria based control is used, then automation is achieved, but the system fails to meet widespread commercial acceptance due to lack of user adaptability
Solution Approach 1:
The system performs preliminary setup where the rider inputs their biometric data, preferred cadence ranges, and shifting preferences before riding. The control system stores these parameters and uses them as baseline settings, allowing the automated system to be pre-configured to the individual rider's characteristics while maintaining the ability to adapt during actual use.
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
This solution provides a robust, user-friendly automatic shifting system that adapts to changing conditions, ensuring optimal pedaling rates and efforts, enhancing the riding experience by relieving the rider of manual shifting tasks and providing customizable settings through a touchscreen interface.
Implementation Method 1
A preferred embodiment of the present invention comprises a novel cable actuation mechanism powered by a servo electric motor
Implementation Method 2
coupled to a high gearing ratio reducer serving to drive a low pitch threaded screw
Implementation Method 3
A preferred embodiment of the bicycle shifter of the present invention comprises a novel touchscreen display, controls and user interface
Data Source
AI summary
A highly adaptable user interface for gearing based bicycle power transmission devices powered by a linear servo actuator slaved to an electronic control system serving to automatically shift into desirable gearing ratios under user predefined shifting criteria adaptable in real time to rider conditioning, comfort level and road conditions thereby alleviating manual shifting tasks and achieving optimal pedal rate and effort settings for the rider. Ability to switch to manual mode augments rider total control of disclosed device.