Mobile Terminal Fall Detection Using Gyroscope and Accelerometer
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Solution Overview
Problem
Existing methods for detecting a mobile device fall from a vehicle holder, such as a bicycle, are not reliable as they typically rely on free fall detection, which is inadequate for situations where the device is thrown or ejected during an accident, leading to delayed recognition.
Innovation Solution
A method using gyroscope and accelerometer readings to detect rotation and movement of the mobile device, considering boundary conditions and integrating historical and threshold values to quickly identify falls or drops, allowing classification of the fall severity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If free fall detection is used to identify mobile device falls from vehicle holders, then the detection method is simple, but the detection reliability is insufficient for vehicle accident scenarios
Solution Approach 1:
The patent combines free fall detection with rotation detection to create a composite detection system. The evaluation unit analyzes both acceleration data (free fall) and gyroscope data (rotation) simultaneously, merging multiple detection approaches to achieve reliable accident detection while maintaining system simplicity
Solution Approach 2:
The detection system is designed to serve multiple functions: it can detect both simple device drops and complex vehicle accidents involving rotation. By making the detection system universal, it handles various accident scenarios (falls, ejections, crashes) with a single integrated approach rather than requiring separate detection methods
2Speed
If only free fall detection is implemented, then the system response is fast for simple drops, but it fails to detect vehicle accidents with rotation
Solution Approach 1:
The system dynamically adapts its detection criteria based on the situation. The evaluation unit continuously monitors both acceleration and rotation data, adjusting its assessment in real-time to distinguish between simple drops (fast detection) and complex accidents involving rotation (comprehensive detection), maintaining speed while improving coverage
3Reliability
If rotation detection is added to free fall detection, then accident detection reliability improves, but device complexity increases
Solution Approach 1:
The mobile device uses its own built-in sensors (accelerometer and gyroscope) for detection, eliminating the need for external specialized equipment. The evaluation unit within the device processes the sensor data itself, making the system self-sufficient and avoiding additional hardware complexity while improving detection reliability
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 falls or drops from a vehicle holder, facilitating timely emergency responses by generating accurate fall information and enabling appropriate actions based on the severity of the accident.
Implementation Method 1
gyroscope readings are acquired. Rotation of the mobile device is detected by comparing the currently acquired and/or integrated gyroscope readings with historical values and/or threshold values
Implementation Method 2
accelerometer readings are acquired. movement of the mobile device is detected based on the currently acquired and/or integrated acceleration values
Data Source
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AI summary
The method described and claimed below, as well as a device that carries out this method according to the invention, is designed to quickly detect the accidental displacement of a mobile device from a holder and to generate corresponding information that characterizes the fall or drop associated with the accident. To implement the method according to the invention, gyroscope and accelerometer readings from the mobile device are acquired. Rotation of the mobile device is detected by comparing the currently acquired and/or integrated gyroscope readings with past values and/or threshold values. In a further step, movement of the mobile device is detected based on the currently acquired and/or integrated accelerometer readings.Optionally, a comparison with historical values and/or threshold values can also be performed. The detection of a vehicle fall, particularly due to an accident, and/or the mobile device falling from its mount is then based on the detected rotation and movement.