Smartphone Moving State Detection Using Acceleration and Magnetic Sensors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for detecting a user's moving state by train, such as those using Felica or acceleration sensors, face challenges in accuracy and cannot effectively determine the moving state when no automatic ticket gate is present, and rely heavily on acceleration data which may lead to erroneous determinations due to temporary vibrations.
Innovation Solution
An electronic device equipped with both an acceleration sensor and a magnetic sensor, along with a controller that determines the moving state by analyzing acceleration data and magnetic field changes, allowing for more accurate identification of train movements using a combination of sensors and communication with external devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only acceleration sensor data is used to determine moving state, then the device complexity is low, but the measurement precision is insufficient
Solution Approach 1:
The patent combines acceleration sensor data with magnetic sensor data to determine the moving state. The controller integrates information from both sensors, using acceleration to detect motion patterns and magnetic field changes to confirm train movement, thereby improving measurement precision while maintaining reasonable device complexity through the use of commonly available sensors.
2Adaptability or versatility
If Felica system is used to detect moving state, then the measurement precision is high, but the adaptability is limited to stations with automatic ticket gates
Solution Approach 1:
The system uses the mobile device's own sensors (acceleration and magnetic sensors) to detect moving state independently, without requiring external infrastructure like automatic ticket gates. This self-service approach allows the system to determine train movement based on characteristic patterns detected by the device itself, greatly improving adaptability to different station types while maintaining measurement precision.
3Reliability
If acceleration sensor alone is used, then the device complexity is low, but the reliability is insufficient due to temporary vibrations
Solution Approach 1:
The system uses magnetic sensor data as feedback to verify and correct acceleration-based moving state determinations. When acceleration suggests train movement but magnetic field changes do not confirm it, the system can reject false positives from temporary vibrations. This feedback mechanism significantly improves reliability by cross-validating sensor data.
4Measurement precision
If multiple sensors are combined to improve accuracy, then the measurement precision is high, but the ease of operation increases due to automatic task execution
Solution Approach 1:
The system automatically executes user-defined tasks based on sensor-based moving state detection without requiring user input or interaction. The controller continuously monitors acceleration and magnetic field data, automatically determines train movement, and triggers predefined tasks such as silencing the device or notifying contacts, thereby maintaining ease of operation while achieving high measurement precision through multi-sensor integration.
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
This solution enhances the accuracy of determining the moving state by train, enabling automatic implementation of user-defined tasks and improving convenience without the need for additional hardware, by leveraging both acceleration and magnetic field data, and communication with external devices.
Implementation Method 1
an acceleration sensor configured to detect acceleration
Implementation Method 2
a magnetic sensor configured to detect magnetism
Data Source
AI summary
A mobile phone includes an acceleration sensor for detecting acceleration, a magnetic sensor for detecting magnetism, and a controller for determining a type of moving state based on the acceleration detected by the acceleration sensor and the magnetism detected by the magnetic sensor.