Bicycle Shifting Controller for Adaptive Automatic Gear Changes
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Solution Overview
Problem
Human-powered vehicles with automatic shifting systems face challenges in seamlessly transitioning shift stages to optimize rider experience, particularly in varying traveling conditions and environments.
Innovation Solution
A shifting controller and system that utilize data acquisition interfaces, storage devices, and control units to dynamically adjust shift stages based on acquired data, including rider inputs, vehicle parameters, and environmental information, ensuring easier and more efficient riding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If automatic shifting control is implemented based on traveling state detection, then the shift stage can be changed automatically to optimize rider experience, but the system complexity increases due to multiple sensors and control mechanisms
Solution Approach 1:
The control unit serves multiple functions: it detects traveling state parameters, determines whether shifting conditions are met, and controls the shifting device operation. By consolidating these functions into a single control unit, the system achieves automatic shifting capability while managing complexity through functional integration rather than adding separate components for each function.
Solution Approach 2:
The shifting system operates autonomously by continuously monitoring traveling state parameters (speed, torque, cadence) and automatically determining when shifting conditions are met without requiring manual rider input. The system serves itself by using its own sensors and control logic to make real-time shifting decisions, optimizing rider experience without increasing operational complexity for the user.
2Measurement precision
If multiple parameters (speed, torque, cadence) are monitored for shifting decisions, then the timing accuracy of shift stage changes is improved, but the measurement and control complexity increases
Solution Approach 1:
The system preliminarily determines whether shifting conditions are met by evaluating multiple parameters (speed, torque, cadence) before actually executing the shift stage change. This preliminary determination ensures that shifting occurs at the optimal timing based on comprehensive parameter analysis, improving measurement precision while managing complexity through a structured decision-making process that prevents premature or inappropriate shifting.
Solution Approach 2:
The control unit continuously monitors traveling state parameters and uses this feedback to determine when shifting conditions are met. The system establishes a feedback loop where detected parameters are constantly compared against predetermined thresholds, and shifting decisions are made based on this real-time feedback. This ensures accurate timing of shift stage changes while managing complexity through a systematic feedback-based control approach.
3Speed
If the shifting device responds quickly to changing conditions, then the rider experience is optimized with timely shift changes, but the response time requirements increase system responsiveness demands
Solution Approach 1:
The control unit operates by periodically detecting traveling state parameters at regular intervals and evaluating whether shifting conditions are met at each detection cycle. This periodic action allows the system to maintain quick response speed by continuously monitoring parameters, while ensuring reliability through a systematic periodic evaluation process that prevents hasty or premature shifting decisions. The periodic detection cycle balances responsiveness with controlled decision-making.
Data Source
AI summary
A shifting controller controls a shifting device of a human-powered vehicle and includes a data acquisition interface, a data storage device, and a control unit. The data acquisition interface is configured to acquire a first reference value of a first variable in relation to the human-powered vehicle. The data storage device has stored therein a shifting condition specified by at least one of a direction of change, an amount of change, and a rate of change that are information on a change in the first variable. The control unit includes a processor that is configured to control the shifting device based on a change in the first reference value and the shifting condition.