Vehicle Biosignal Sensing with Dual Vibration Separation
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Solution Overview
Problem
Existing biological information detection systems in vehicles suffer from reduced accuracy due to the influence of vehicle vibrations and body movements, which are not effectively separated from the measurement of human body vibrations, leading to inaccurate biological information.
Innovation Solution
A biological information detection device comprising a radio wave sensor, a first vibration sensor positioned away from the supporting surface, and a second vibration sensor closer to the supporting surface, with a signal processing unit that generates biosignals by combining and separating these components to suppress vehicle vibrations and body movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single vibration sensor is used to suppress body movement, then body movement influence is reduced, but vehicle vibration influence remains and reduces measurement accuracy
Solution Approach 1:
The vibration sensor system is segmented into two distinct sensors positioned at different locations: a first vibration sensor attached to the seat cushion to capture body movement, and a second vibration sensor positioned away from the supporting surface to capture vehicle vibration. This segmentation allows independent measurement and subsequent separation of the two vibration sources through signal processing.
Solution Approach 2:
The patent introduces an intermediate processing mechanism (signal processing unit) that acts as a mediator to separate the mixed vibration signals from the two sensors. By using reference signals and adaptive filtering, the system mediates between the raw sensor outputs and the final biological information extraction, effectively isolating body movement from vehicle vibration.
2Object-affected harmful factors
If vibration suppression is applied to remove vehicle vibration, then vehicle vibration influence is reduced, but body movement component may be incorrectly removed
Solution Approach 1:
The system segments the vibration sources into two independently measured components using spatially separated sensors. The first sensor captures primarily body movement while the second captures primarily vehicle vibration, allowing the signal processing unit to selectively remove vehicle vibration without affecting body movement information.
Solution Approach 2:
Each vibration sensor is positioned with specific local quality characteristics: the first vibration sensor is positioned to have high sensitivity to body movement, while the second vibration sensor is positioned to have high sensitivity to vehicle vibration. This local differentiation enables selective suppression of vehicle vibration while preserving body movement signals.
3Measurement precision
If two vibration sensors are used to separate body movement and vehicle vibration, then both influences can be suppressed, but device complexity increases
Solution Approach 1:
The system divides the vibration measurement function into two separate sensor units with distinct positioning and measurement characteristics. This segmentation enables parallel measurement of different vibration sources, which is then processed through signal separation algorithms to achieve high-accuracy biological information detection despite the increased sensor count.
Solution Approach 2:
Both vibration sensors use the same basic sensor technology and processing methods, allowing the system to leverage universal processing algorithms for both sensors. The signal processing unit applies similar techniques to both sensor inputs, reducing the complexity increase that would otherwise result from needing entirely different processing approaches for each sensor.
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 achieves accurate detection of biological information by minimizing the influence of vehicle vibrations and body movements, resulting in improved accuracy of vital signs measurement.
Implementation Method 1
a radio wave sensor that detects a body surface displacement of a human body
Implementation Method 2
a first vibration sensor that is disposed together with the radio wave sensor at a position away from a supporting surface that supports the human body; a second vibration sensor that is disposed closer to the supporting surface than the first vibration sensor
Data Source
AI summary
To realize a biological information detection device capable of obtaining accurate biological information. The biological information detection device includes a radio wave sensor that detects a body surface displacement of a human body; a first vibration sensor that is disposed together with the radio wave sensor at a position away from the supporting surface that supports the human body; a second vibration sensor that is disposed closer to the supporting surface than the first vibration sensor; and a signal processing unit that generates a biosignal of the human body based on the body surface displacement obtained by the radio wave sensor, a first vibration component obtained by the first vibration sensor, and a second vibration component obtained by the second vibration sensor.