Traveling State Determination via Acceleration Cycle Comparison
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Solution Overview
Problem
Existing devices face challenges in accurately determining whether a user is riding in a train or a car, and in accurately detecting walking or running states when worn versus held in the hand, due to variations in acceleration sensor outputs.
Innovation Solution
A traveling state determining device using an acceleration sensor that extracts specific acceleration components and compares varying cycles to differentiate between rail and road travel, and between wearing and holding the device, allowing for precise state determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an acceleration sensor is used to detect transportation options, then the ability to specify traveling state is improved, but the measurement precision deteriorates due to difficulty in accurately detecting rail vs. road travel
Solution Approach 1:
The acceleration data is segmented into multiple direction components (vertical direction component and lateral direction component) and further processed into frequency components. By analyzing different segments of the acceleration signal in separate frequency bands, the system can distinguish between rail and road transportation modes that would be indistinguishable in a single raw signal.
Solution Approach 2:
The system transforms the acceleration signal from the time domain to the frequency domain by extracting frequency components. This dimensional transformation enables the system to identify transportation modes based on their characteristic frequency signatures, providing a new dimension of analysis that resolves the detection accuracy problem.
2Measurement precision
If the device is worn or retained on the body of a user, then the measurement precision of moving state is improved, but the device complexity increases due to need for cycle comparison
Solution Approach 1:
The system automatically determines the wearing state by comparing the varying cycles of acceleration components without requiring manual input or user action. The acceleration sensor data itself provides the information needed to distinguish between worn and held states through automated cycle comparison, making the system self-diagnostic.
Solution Approach 2:
The system changes the parameter of analysis from raw acceleration values to varying cycle characteristics. By transforming the data into cycle-based parameters and comparing them against predetermined thresholds, the system achieves reliable state detection while keeping the processing logic manageable through threshold-based decision making.
3Ease of operation
If the device is held in a hand of a user, then the ease of operation is improved, but the measurement precision of moving state deteriorates due to difficulty in detecting walking or running state
Solution Approach 1:
The system dynamically adapts its detection methodology based on the detected state. By continuously monitoring the varying cycles of acceleration components and comparing them to predetermined thresholds, the system can identify whether the device is being held or worn, and adjust its interpretation of the acceleration data accordingly to maintain accurate state detection despite the different usage conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device effectively discriminates between traveling states, including rail vs. road transport and walking/running states, even when worn or held, enhancing route specification and transportation option recording accuracy.
Implementation Method 1
an acceleration sensor which detects an acceleration
Implementation Method 2
an acceleration sensor which detects an acceleration
Data Source
AI summary
Disclosed is a traveling state determining device including an acceleration sensor which detects an acceleration, a cycle comparing unit which compares a varying cycle of an acceleration of a vertical direction component in an output of the acceleration sensor to a varying cycle of an acceleration of a horizontal direction component and a state determining unit which determines between a state where a user is walking or running by wearing or retaining the traveling state determining device on a body of the user and a state where the user is walking or running by holding the traveling state determining device in a hand of the user based on the comparing result of the cycle comparing unit.