Bicycle Force Sensor Calibration Using Usage-Based Periodic Adjustment
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Solution Overview
Problem
Existing human-powered vehicle devices face issues with sensor zero point variation due to use and deterioration, leading to reduced processing speed and durability of electronic controllers, along with inaccurate output adjustments.
Innovation Solution
An electrical device for a rotational device in a human-powered vehicle that includes a force sensor and an electronic controller, which adjusts output values based on vehicle information such as usage history, elapsed time, total period of use, total travel distance, and total number of uses, to maintain balance between processing speed, durability, and accuracy of output adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the electronic controller continuously adjusts the output value of the force sensor, then the accuracy of adjustment is improved, but the processing speed and durability of the electronic controller deteriorate
Solution Approach 1:
The electronic controller adjusts the output value of the force sensor not continuously but periodically based on usage history. Adjustment timing is determined by checking whether usage conditions (elapsed time, total period of use, total travel distance, or total number of uses) meet predetermined thresholds, converting continuous adjustment into periodic action to reduce processing load while maintaining accuracy when needed
2Measurement precision
If the electronic controller continuously adjusts the output value of the force sensor, then the accuracy of adjustment is improved, but the processing speed of the electronic controller deteriorates
Solution Approach 1:
The controller performs adjustment operations only when usage history thresholds are met rather than continuously, reducing the frequency of processing operations. This periodic execution based on accumulated usage data maintains measurement accuracy when adjustments are needed while significantly improving processing speed by avoiding unnecessary continuous calculations
3Measurement precision
If the electronic controller adjusts the output value frequently, then the accuracy of adjustment is improved, but the power consumption increases
Solution Approach 1:
The electronic controller adjusts the force sensor output value periodically based on usage history thresholds rather than frequently or continuously. By triggering adjustments only when elapsed time, total period of use, total travel distance, or total number of uses reach predetermined values, the system maintains accuracy while reducing the frequency of power-consuming operations
Data Source
AI summary
An electrical device of a rotational device for a human-powered vehicle comprises a force sensor and an electronic controller. The force sensor is configured to sense a force applied to the rotational device. The electronic controller is configured to adjust an output value of the force sensor at an adjustment timing in a case where vehicle information relating to the human-powered vehicle meets a determination condition. The electronic controller is configured not to adjust the output value at the adjustment timing in a case where the vehicle information does not meet the determination condition.