Human-Powered Vehicle Electronics With Timed Sleep States
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Solution Overview
Problem
Existing electrical devices in human-powered vehicles face challenges in power consumption, accuracy of charge level estimation, and protection from external electrical operations.
Innovation Solution
The electrical device incorporates an electronic controller that switches between states based on predefined sleep and wake conditions, utilizing sensors to detect axial, radial, and rotational accelerations, and includes a protection circuit to manage power consumption and communication with external devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the electrical device continuously monitors motion conditions to determine wake/sleep states, then the responsiveness to user operations is improved, but the power consumption increases
Solution Approach 1:
The electronic controller periodically monitors motion conditions for predetermined determination times to determine wake/sleep states, rather than continuously monitoring. This periodic action reduces power consumption while maintaining operational responsiveness by checking motion conditions at regular intervals.
Solution Approach 2:
The system dynamically adjusts its operational state between wake and sleep modes based on real-time motion condition monitoring. The electronic controller transitions between high-power wake state and low-power sleep state according to detected motion conditions, optimizing the balance between responsiveness and power consumption.
2Device complexity
If the electronic controller uses a single sleep determination time threshold, then the control logic is simplified, but the accuracy of charge level estimation deteriorates
Solution Approach 1:
The sleep determination time is segmented into multiple predetermined determination times (first determination time, second determination time, etc.). Each determination time corresponds to different motion condition thresholds, allowing the system to accurately estimate charge levels by matching the appropriate determination time with the detected motion conditions.
3Loss of energy
If the electrical device enters sleep state quickly after motion condition change, then the power consumption is reduced, but the reliability of operation deteriorates
Solution Approach 1:
The electronic controller preliminarily determines whether motion conditions are met before transitioning to sleep state. By checking motion conditions for predetermined determination times in advance, the system ensures reliable operation by confirming sustained motion patterns before entering power-saving mode, preventing premature sleep state transitions.
Data Source
AI summary
An electrical device of a rotational device for a human-powered vehicle comprises an electronic controller. The electronic controller is configured to operate with first power consumption in a first state and configured to operate with second power consumption lower than the first power consumption in a second state. The electronic controller is configured to change a state of the electrical device from the first state to the second state in a case where a first sleep condition is met for a first sleep determination time in the first state. The electronic controller is configured to change the state of the electrical device from the first state to the second state in a case where a second sleep condition is met for a second sleep determination time in the first state. The second sleep determination time is shorter than the first sleep determination time.