Electronic Controller Torque Peak Avoidance Shifting
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Solution Overview
Problem
Human-powered vehicle transmission systems experience awkward shifting operations due to the timing of torque peaks, which are influenced by user posture and vehicle inclination, leading to inefficient shifting.
Innovation Solution
An electronic controller monitors torque applied to the vehicle and controls the transmission device to perform shifting operations at a timing that differs from the torque peak, using a predetermined proportion of the peak torque value, and adjusts based on rotational speed and other factors to optimize shifting timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If shifting operation is performed at top dead center or bottom dead center, then shifting operation can be executed, but shifting occurs at torque peak causing user awkwardness
Solution Approach 1:
The control device determines the torque peak in advance and calculates the optimal shifting timing before execution. By predicting the torque peak position and computing the appropriate shifting moment based on crank rotation, the system prepares the shifting operation to occur at the most favorable timing, avoiding torque peaks and ensuring smooth execution.
Solution Approach 2:
The system continuously monitors crank rotation angle and torque characteristics, using this feedback to dynamically adjust shifting timing. The control device calculates the angle between crank arms and determines optimal shifting moments based on real-time torque peak detection, creating a closed-loop control system that adapts to varying riding conditions.
2Device complexity
If shifting timing is fixed at specific crank positions, then control is simplified, but accuracy of avoiding torque peak is insufficient
Solution Approach 1:
The system replaces simple position-based mechanical timing with electronic control that calculates optimal shifting moments. The control device uses computational algorithms to determine torque peaks and calculate precise shifting timing based on crank rotation dynamics, substituting mechanical simplicity with electronic precision to achieve both accuracy and adaptability.
Solution Approach 2:
The control device dynamically adjusts shifting timing parameters based on calculated torque peaks and crank rotation characteristics. Rather than using fixed timing, the system varies the shifting moment parameter according to real-time conditions, optimizing the timing accuracy while maintaining manageable control complexity through parameter-based adaptation.
3Ease of operation
If automatic transmission control is implemented, then user comfort is improved, but system complexity increases
Solution Approach 1:
The control device integrates multiple functions into a single electronic controller that handles torque peak detection, shifting timing calculation, and transmission control. By consolidating these functions, the system achieves automatic transmission control and user comfort improvement while limiting complexity growth through functional integration rather than adding separate dedicated components.
Solution Approach 2:
The transmission system performs automatic shifting operations without requiring direct user intervention. The control device autonomously monitors conditions, determines optimal timing, and executes shifting commands, allowing the system to serve itself and improving user comfort by eliminating manual shifting operations entirely.
Data Source
AI summary
A control device includes an electronic controller configured to control a transmission device of a human-powered vehicle in accordance with a shifting condition. The electronic controller is configured to monitor a torque applied to the human-powered vehicle upon determining the human-powered vehicle is ridden and driven. The electronic controller is configured to permit a shifting operation of the transmission device in accordance with a peak value of the torque upon determining the shifting condition is satisfied.