Bicycle Transmission Control with Auto-Manual Shift Switching
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Solution Overview
Problem
Existing human-powered vehicle control systems fail to effectively adjust transmission ratios in response to changing riding conditions, leading to suboptimal performance and rider control.
Innovation Solution
A human-powered vehicle control device with an electronic controller that adjusts transmission ratios based on shifting conditions, using reference values related to rotational speed and torque, and converging reference values specific to riding states, allowing for precise control through different control states and operational inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the transmission ratio is changed automatically based on reference values, then the control system can operate autonomously, but the rider cannot directly control the transmission ratio according to their immediate needs
Solution Approach 1:
The system dynamically switches between two control modes: automatic control mode where the electronic controller adjusts transmission ratio based on reference values, and manual control mode where the rider can directly control transmission ratio through operation portions. This dynamic switching resolves the contradiction by allowing the system to adapt its control characteristics based on rider needs.
2Device complexity
If the shifting condition uses fixed reference values, then the control logic is simple, but it cannot adapt to changing riding conditions and rider preferences
Solution Approach 1:
The electronic controller changes the shifting condition by updating reference values based on detected riding states (such as acceleration, deceleration, or constant speed states). This allows the system to adapt to varying riding conditions while maintaining a relatively simple control structure that builds upon the basic reference value comparison logic.
3Productivity
If the transmission ratio changes frequently to optimize performance, then the power delivery is optimized, but the transmission device experiences increased wear and mechanical stress
Solution Approach 1:
The electronic controller monitors the transmission ratio change amount and uses this feedback to determine whether to permit or restrict further transmission ratio changes. When the change amount exceeds a predetermined threshold, the controller restricts additional changes, thereby preventing excessive transmission device operation while still optimizing power delivery within safe limits.
Data Source
AI summary
A human-powered vehicle control device is provided for controlling a human-powered vehicle. The human-powered vehicle control device includes an electronic controller controls a transmission device in accordance with a control state including first and second control states. The electronic controller changes the transmission ratio in accordance with a shifting condition including a reference value related to a traveling state of the human-powered vehicle in the first control state. The electronic controller changes the transmission ratio in accordance with an operation performed on an operation portion in the second control state. The electronic controller changes the shifting condition in accordance with a converging reference value for a case where the human-powered vehicle is in a riding converging state. The electronic controller changes the shifting condition in accordance with the converging reference value for a case where the control state is the second control state.