Dynamic Threshold Adjustment for Walking State Detection
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Solution Overview
Problem
Existing walk measurement technologies face challenges in efficiently managing power consumption and flexibly responding to changes in walking states, particularly due to fixed thresholds that can lead to inappropriate mode switching and inefficient power saving.
Innovation Solution
A determination device that receives sensor data, switches between power saving and walk measurement modes based on acceleration thresholds, detects change trends in peak values, and dynamically adjusts these thresholds to optimize mode switching and power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If fixed thresholds are used for mode switching, then power consumption is reduced through mode switching, but the system cannot flexibly respond to changes in walking state
Solution Approach 1:
The patent applies dynamics by transitioning from fixed thresholds to dynamically adjustable thresholds. The threshold adjustment unit modifies the second threshold based on the detected change trend of peak values, allowing the system to adapt its sensitivity to walking state changes. This enables flexible response to varying walking conditions while maintaining power-saving mode switching capability.
Solution Approach 2:
The patent implements parameter changes by adjusting the threshold parameter based on the change trend of peak values. When the change trend indicates significant variations in walking state, the threshold is adjusted to ensure accurate mode switching. This parameter adaptation resolves the contradiction by allowing the system to maintain energy efficiency while responding flexibly to walking state changes.
2Device complexity
If fixed thresholds are used for walk measurement, then device complexity is reduced, but measurement accuracy deteriorates when walking state fluctuates
Solution Approach 1:
The patent applies self-service by enabling the system to automatically adjust its own thresholds based on detected walking state changes. The threshold adjustment unit monitors the change trend of peak values and autonomously modifies the second threshold without external intervention. This self-adjusting mechanism maintains measurement accuracy while avoiding the complexity of manual threshold management.
Solution Approach 2:
The patent implements feedback by using the detected change trend of peak values to adjust the threshold. The system continuously monitors walking state through peak value analysis and feeds this information back to the threshold adjustment unit, which modifies the threshold accordingly. This feedback loop ensures accurate walk measurement even when walking state fluctuates, without significantly increasing device complexity.
3Loss of energy
If power saving mode is used extensively, then power consumption is reduced, but the ability to detect and respond to walking state changes is diminished
Solution Approach 1:
The patent applies preliminary action by detecting changes in peak values during power-saving mode and preparing for mode transitions in advance. The system monitors the change trend of peak values and adjusts thresholds proactively, enabling timely switching to normal measurement mode when walking state changes are detected. This preliminary detection and preparation ensures reliable walking state detection while minimizing the time spent in high-power modes.
Solution Approach 2:
The patent implements periodic action by continuously monitoring peak values and their change trends at regular intervals during power-saving mode. This periodic monitoring allows the system to detect walking state changes reliably while maintaining low power consumption between monitoring cycles. The rhythmic detection pattern balances energy efficiency with detection reliability.
Data Source
AI summary
A determination device includes: a sensor data reception unit that receives sensor data including acceleration in a travel direction of a user and in a gravity direction; a walking state discrimination unit that switches to a discrimination mode in response to the acceleration in the gravity direction exceeding a first threshold in a power saving mode, and switches to a walk measurement mode in response to the acceleration in the travel direction exceeding a second threshold in the discrimination mode; a change trend detection unit that detects a change trend of peak values using log data of the peak values of the acceleration in the travel direction in the discrimination mode; a threshold change unit that changes the second threshold based on a detection result by the change trend detection unit; and a transmission unit that transmits the sensor data in the walk measurement mode.