Dynamic Determination Value Adjustment for Human-Powered Vehicle Control
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Solution Overview
Problem
Existing human-powered vehicle control devices fail to optimally adjust transmission ratios in response to changing traveling environments and states, leading to inefficient energy transfer and rider experience.
Innovation Solution
An electronic controller that dynamically adjusts transmission ratios based on real-time comparisons of parameters such as rotational speed, vehicle speed, and inclination angle, using determination values that change during a single crank rotation or a predetermined period, to maintain optimal energy transfer and rider comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the transmission ratio is controlled based on fixed determination values, then the control logic is simple, but the transmission ratio cannot be optimally adjusted to changing traveling conditions
Solution Approach 1:
The determination values are changed dynamically during a single crank rotation period based on real-time parameter changes. The electronic controller adjusts determination values at multiple timing points (first, second, and third determination timings) within one crank rotation, allowing the transmission control to adapt to changing traveling conditions without requiring complex long-term data processing.
Solution Approach 2:
The patent changes the determination values used for transmission ratio control based on the magnitude of parameter changes detected during crank rotation. When parameter changes exceed predetermined thresholds, the determination values are adjusted accordingly, enabling optimal transmission ratio selection that adapts to varying traveling environments while maintaining relatively simple control logic.
2Productivity
If the determination value is changed frequently to track parameter changes, then the transmission ratio adapts well to changing conditions, but the control system becomes more complex
Solution Approach 1:
The electronic controller performs determination value changes periodically within each crank rotation period. By establishing specific determination timings (first, second, third determination timings) within each crank rotation, the system achieves regular periodic control actions that maintain energy transfer efficiency while keeping the control logic structured and manageable.
Solution Approach 2:
The determination values are changed based on predetermined thresholds of parameter change magnitudes. This threshold-based approach allows the control system to adjust transmission ratios efficiently when needed while avoiding unnecessary control actions, thereby maintaining high energy transfer efficiency with controlled system complexity.
3Speed
If the transmission ratio is adjusted based on long-term parameter trends, then the control is stable, but the response to immediate changing conditions is delayed
Solution Approach 1:
The electronic controller prepares and adjusts determination values in advance within each crank rotation period, before the actual transmission ratio control is executed. This preliminary adjustment of determination values based on current parameter changes enables the system to respond quickly to changing conditions while maintaining stable control through pre-planned adjustment sequences.
Solution Approach 2:
The system implements dynamic determination value changes at multiple timing points within a single crank rotation, enabling rapid response to immediate traveling condition changes. By making the control system dynamic and responsive to real-time parameter changes rather than relying on long-term trends, the patent achieves both fast response speed and operational stability.
Data Source
AI summary
A human-powered vehicle control device includes an electronic controller configured to control a transmission that changes a transmission ratio of a rotational speed of a wheel of a human-powered vehicle to a rotational speed of a crank of the human-powered vehicle. The electronic controller is configured to control the transmission to change the transmission ratio in accordance with a comparison of a parameter related to at least one of a traveling environment and a traveling state of the human-powered vehicle with a predetermined determination value. The electronic controller is configured to change the predetermined determination value in accordance with a change in the parameter during a single rotation of the crank.