Electronic Controller Pitch Change Shifting Restriction
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Solution Overview
Problem
Existing control devices for human-powered vehicles do not effectively manage the load on the rider by restricting shifting actions during significant pitch changes, which can lead to increased rider load and discomfort.
Innovation Solution
A control device with an electronic controller that restricts the first shifting action that increases the transmission ratio when the pitch change amount exceeds a certain threshold, thereby maintaining a stable load on the rider.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the transmission ratio is increased through shifting actions, then the vehicle speed is improved, but the load on the rider increases during pitch changes
Solution Approach 1:
The control device dynamically adjusts transmission ratio based on real-time detection of pitch change amounts. When pitch change exceeds a threshold, the control device restricts shifting actions that would increase transmission ratio, thereby adapting the transmission system to current riding conditions and preventing excessive load on the rider during pitch changes
Solution Approach 2:
The control device continuously monitors pitch angle changes through sensors and uses this feedback information to make real-time decisions about restricting shifting actions. The pitch change amount is calculated and compared against thresholds, and based on this feedback, the control device appropriately restricts or allows shifting operations to maintain optimal balance between speed and rider load
2Force
If shifting actions are restricted during pitch changes, then the load on the rider is reduced, but the vehicle speed may be limited
Solution Approach 1:
The control device changes the operational parameters of the transmission system by dynamically adjusting whether shifting actions are permitted based on pitch change conditions. When pitch change amount exceeds the threshold, the control device modifies the transmission ratio parameter by restricting upward shifting, thereby changing the system's mechanical characteristics to reduce rider load during pitch changes
3Adaptability or versatility
If the transmission ratio is frequently shifted, then the adaptability to different riding conditions is improved, but the complexity of the control system increases
Solution Approach 1:
The control device segments the shifting control into distinct operational modes: normal mode where shifting is permitted, and restricted mode where upward shifting is limited during pitch changes. This segmentation simplifies the control logic by creating clear decision boundaries based on pitch change thresholds, making the system easier to implement and manage while maintaining adaptability to different riding conditions
Data Source
AI summary
A control device for a human-powered vehicle includes an electronic controller configured to control a transmission device. The transmission device is configured to shift a transmission ratio that is a ratio of a wheel rotational speed of a drive wheel of the human-powered vehicle to a crank rotational speed of a crank axle of the human-powered vehicle. The electronic controller is configured to control the transmission device so as to restrict a first shifting action that increases the transmission ratio in a case where a pitch change amount is greater than or equal to a first change amount. The pitch change amount is a change amount of a pitch angle of the human-powered vehicle.