Rider-Posture Device Position Accuracy
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Solution Overview
Problem
Existing rider-posture changing devices for human-powered vehicles face challenges in accurately determining the current position of movable members, leading to inconsistencies and reduced precision in posture adjustments.
Innovation Solution
A rider-posture changing device comprising a first and second member, detectors, and a controller that detects absolute and additional positions, resets information based on predetermined ranges, and uses non-contact or contact detectors to improve positional accuracy, allowing for precise posture changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single detector is used to track movement distance, then the device complexity is reduced, but the measurement precision of current position deteriorates due to accumulation of position errors
Solution Approach 1:
The patent combines two detection methods: a first detector that detects absolute position (e.g., using absolute encoding) and a second detector that detects movement distance (e.g., using incremental encoding). The controller merges the information from both detectors to calculate the current position, thereby improving measurement precision while maintaining reasonable device complexity. The absolute position detector provides a reference point to correct cumulative errors from the movement distance detector.
Solution Approach 2:
The controller acts as an intermediary that processes information from both detectors. It uses the absolute position information as a reference to correct and calibrate the movement distance measurements, thereby improving the overall current position accuracy without requiring the absolute position detector to continuously track every movement.
2Measurement precision
If absolute position detection is continuously tracked, then the measurement precision of current position is improved, but the loss of information increases due to detector limitations and error accumulation
Solution Approach 1:
The system performs preliminary detection of absolute position at specific reference points (e.g., home position, limit switches) rather than continuously tracking. This absolute position information is stored and used as a reference to correct the movement distance measurements, preventing error accumulation while minimizing information loss. The preliminary absolute position detection resets the reference frame for subsequent movement tracking.
3Measurement precision
If multiple detectors are integrated to improve position accuracy, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The detection system is segmented into two functional parts: an absolute position detection component and a movement distance detection component. Each detector is optimized for its specific function, and the controller segments the processing by handling absolute position correction separately from incremental movement tracking. This segmentation allows the system to achieve high precision without requiring a completely complex unified detection system.
Data Source
AI summary
A rider-posture changing device for a human-powered vehicle comprises a first member, a second member, a first detector, a second detector, and a controller. The first member extends in a longitudinal direction. The second member is configured to be movable relative to the first member in the longitudinal direction. The first detector is configured to detect first information indicating whether the second member reaches an absolute position or not. The second detector is configured to detect second information indicating a movement distance of the second member from a reference position in the longitudinal direction. The controller is configured to obtain a current position of the second member relative to the first member based on the second information and the reference position. The controller is configured to store the absolute position as the reference position in accordance with the first information.