Bicycle Transmission Control Using Steering and Surface State Detection
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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 preparations, leading to inadequate control in various scenarios.
Innovation Solution
An electronic controller that switches between two control states to either change or suppress transmission ratio adjustments based on detected steering angles, rider gripping states, surface friction coefficients, and pedaling readiness, using various detection units to assess these conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission ratio is changed according to prescribed conditions, then the transmission control is improved, but the control becomes inadequate in cases where changing the transmission ratio is not preferable
Solution Approach 1:
The control device dynamically switches between a first control state (where transmission ratio changes are permitted) and a second control state (where transmission ratio changes are suppressed) based on real-time detection of steering angle, surface condition, and pedaling preparation state. This dynamic state switching enables the system to adapt transmission control behavior to current riding conditions, resolving the contradiction between maintaining reliable control and achieving situational adaptability.
2Reliability
If the transmission ratio changes are suppressed during specific conditions, then unnecessary changes are prevented, but the transmission control responsiveness is reduced
Solution Approach 1:
The system performs preliminary assessment by detecting steering angle, surface friction coefficient, and pedaling preparation state before determining whether to suppress transmission ratio changes. By evaluating these conditions in advance, the control device can proactively switch to the second control state when inappropriate changes are anticipated, preventing unnecessary transmission shifts while maintaining readiness to respond when conditions change.
3Measurement precision
If multiple detection units are used to assess steering state, surface condition, and pedaling preparation, then control precision is improved, but device complexity increases
Solution Approach 1:
The control device integrates multiple detection functions into a unified system that simultaneously evaluates steering angle (via fifth detection unit), surface friction coefficient (via seventh detection unit), and pedaling preparation state (via eighth detection unit). This multi-functional approach allows the system to achieve comprehensive condition assessment precision while managing device complexity through integrated control logic that processes all detection inputs together rather than as separate independent systems.
Data Source
AI summary
A human-powered vehicle control device controls the transmission to initiate a shifting operation based on a set of prescribed conditions 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 prevent the change of the transmission ratio as compared with if the electronic controller is in the first control state. The electronic controller switches between the first control state and the second control state in accordance with a detection of 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.