Bicycle Transmission Control for Steering-Aware Shift Suppression
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Solution Overview
Problem
Human-powered vehicle control devices do not effectively manage transmission ratio changes based on steering states, surface conditions, and pedaling preparation, leading to unsuitable control in certain scenarios.
Innovation Solution
An electronic controller that switches between two control states to either change or suppress transmission ratio changes based on detected steering angles, rider gripping states, surface friction coefficients, and pedaling preparations, using various detection units to assess these conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the transmission ratio is changed according to prescribed conditions, then the transmission control is simplified, but the control becomes unsuitable in certain scenarios such as during steering or on slippery surfaces
Solution Approach 1:
The control device dynamically switches between two control states (first control state for automatic transmission ratio change, second control state for suppressing transmission ratio change) based on detected steering angles, surface conditions, and pedaling states. This dynamic adaptation allows the system to maintain reliability across varying operational scenarios while keeping the control logic manageable through state-based decision making.
2Productivity
If the transmission ratio changes automatically based on travel state, then the productivity is improved, but the stability deteriorates during steering or on low-friction surfaces
Solution Approach 1:
The control device uses feedback from detection units that monitor steering angles, surface friction coefficients, and pedaling states to determine whether to maintain automatic transmission control or switch to a suppressed control mode. This feedback mechanism ensures that automatic transmission ratio changes only occur when they will not compromise vehicle stability, thereby maintaining both productivity and stability.
3Stability of the object's composition
If the transmission ratio is suppressed from changing, then the vehicle stability is improved during steering, but the productivity decreases due to less adaptive transmission control
Solution Approach 1:
The system dynamically adjusts between suppressing and allowing transmission ratio changes based on real-time detection of steering angles, surface conditions, and pedaling states. During steering or on low-friction surfaces, the system suppresses transmission ratio changes to maintain stability, while in other conditions it allows automatic changes to optimize productivity, thus balancing both requirements.
4Measurement precision
If multiple detection units are added to detect steering state, surface condition, and pedaling preparation, then the control accuracy is improved, but the device complexity increases
Solution Approach 1:
The control device integrates multiple detection functions into a unified control architecture that processes steering angles, surface friction coefficients, and pedaling states through a single controller. This multi-functional approach improves measurement precision for transmission control decisions while minimizing the increase in device complexity by consolidating detection and control functions in one integrated system.
Data Source
AI summary
A human-powered vehicle control device controls the transmission that changes the transmission ratio of a human-powered vehicle. The control device includes an electronic controller that switches between a first control state for controlling the transmission to change the transmission ratio in accordance with a first prescribed set of conditions, and a second control state for controlling the transmission to suppress the change of the transmission ratio as compared with if the electronic controller is in the first control state, in accordance with at least one of a steering state of the human-powered vehicle, a surface condition of a travel path on which the human-powered vehicle travels, and a pedaling preparation state related to the pedals of the human-powered vehicle.