Mobile Terminal Holder Ejection Detection via Motion Sensor Fusion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for detecting the fall of a mobile user terminal from a vehicle holder, such as a smartphone on a bicycle handlebar, are inadequate as they fail to rapidly detect accidents involving a flying movement, which is not a direct freefall.
Innovation Solution
Utilizing rotation-rate and acceleration sensors to detect atypical movements and rotations of the mobile user terminal, integrating these variables to derive a movement plane, and comparing them with threshold values to identify a fall or crash, enabling rapid detection and classification of the severity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If rotation-rate and acceleration sensors are used to detect atypical movements, then detection speed and accuracy for accidents improve, but device complexity increases
Solution Approach 1:
The mobile user terminal's existing sensors (rotation-rate sensor and acceleration sensor) are utilized for multiple purposes: normal operation monitoring and accident detection. By processing sensor data through integration and threshold comparison, the system achieves accurate accident detection without adding dedicated hardware, thus improving measurement precision while avoiding increased device complexity.
2Reliability
If integration of rotation-rate variables is performed to detect rapid rotation, then detection of flying movement improves, but processing time and computational load increase
Solution Approach 1:
The system continuously integrates rotation-rate sensor variables in real-time during normal operation, maintaining a running accumulation of rotational data. When an accident occurs, the pre-computed integrated values can be immediately compared against thresholds without requiring new integration calculations, thus improving detection reliability while minimizing additional processing time.
Solution Approach 2:
The evaluation unit performs periodic comparison of integrated rotation variables against predetermined thresholds at regular intervals. This periodic evaluation approach ensures that rapid rotations are detected promptly while allowing the system to process data in manageable cycles, balancing detection reliability with processing efficiency.
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
Enables rapid detection and classification of accidents by distinguishing between normal and atypical movements, allowing for timely emergency responses and appropriate measures.
Implementation Method 1
A rotation or twisting of the mobile user terminal is detected in that the currently acquired and/or integrated rotation-rate sensor variables are compared with past values and/or threshold values
Implementation Method 2
a movement of the mobile user terminal is detected on the basis of the instantaneously acquired and/or integrated acceleration variables
Data Source
AI summary
A method described and device to rapidly detect the accident-related removal of a mobile user terminal from a holder and to generate corresponding information which characterizes the fall or crash related to the accident. Rotation-rate sensor variables and acceleration variables of the mobile user terminal are acquired. A rotation or twisting of the mobile user terminal is detected in that the currently acquired and/or integrated rotation-rate sensor variables are compared to past values and/or threshold values. A movement of the mobile user terminal is detected on the basis of the currently acquired and/or integrated acceleration variables. A comparison with past values and/or threshold values may optionally also be carried out. The determination of an in particular accident-related crash of the vehicle and/or the fall of the mobile user terminal out of the holder then takes place due to the detected rotation and the detected movement.