Flexible Capacitive Seat Sensor for Posture and Strain Detection
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Solution Overview
Problem
Existing seat sensors are not sensitive enough to determine seat posture and other parameters such as strain and bending under varying operating loads, limiting their ability to provide comprehensive information for vehicle seat systems.
Innovation Solution
A vehicle seat sensor system comprising flexible seat sensors with signal and ground electrodes and dielectric layers, capable of detecting pressure, force, and strain in multiple dimensions, integrated with an electronics unit to analyze capacitive outputs for real-time data on seat posture and occupant presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional capacitive sensors are used in a single package, then the device complexity is reduced, but the measurement precision for seat posture and strain is insufficient
Solution Approach 1:
The patent divides the sensor system into multiple discrete sensor packages, each equipped with signal electrodes, ground electrodes, and dielectric layers. Each sensor package is positioned at specific locations on the seat to detect local strain and bending independently, thereby improving overall measurement precision for seat posture while maintaining manageable system complexity through modular design.
Solution Approach 2:
The patent enhances measurement capability by detecting not only capacitive changes but also bending and strain in multiple dimensions. By positioning sensors to detect curvature and deformation in different orientations, the system achieves comprehensive three-dimensional posture detection, improving measurement precision without requiring a single overly complex sensor package.
2Measurement precision
If sensors are positioned far from the seat surface, then the device complexity is reduced, but the sensitivity to strain and bending decreases
Solution Approach 1:
The patent employs flexible sensor packages with thin dielectric layers that can be positioned close to the seat surface without adding significant bulk or complexity. The flexible construction allows the sensors to conform to the seat surface geometry, maintaining high sensitivity to strain and bending while simplifying integration through adaptable, thin-film-based designs.
Solution Approach 2:
The patent designs sensor packages that can detect and adapt to curved surfaces, allowing them to be positioned close to the contoured seat surface. The sensors are configured to measure bending and curvature changes, enabling high sensitivity to strain while maintaining a compact form factor that simplifies integration into the seat structure.
3Adaptability or versatility
If multiple sensor parameters are measured simultaneously, then the adaptability of the seat system is improved, but the device complexity increases
Solution Approach 1:
The patent designs each sensor package to perform multiple functions: detecting capacitive changes, measuring strain, and detecting bending simultaneously. This multi-functionality is achieved through a unified sensor structure with signal and ground electrodes that responds to various physical stimuli, thereby improving seat system adaptability without requiring separate specialized sensors for each parameter.
Solution Approach 2:
The patent combines multiple detection capabilities (capacitive sensing, strain measurement, bending detection) into integrated sensor packages that operate simultaneously. By merging these functions into cohesive sensor units positioned at key locations, the system achieves comprehensive parameter detection while avoiding the complexity of multiple separate sensor systems.
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 system provides accurate, real-time data on seat posture and occupant presence, enhancing the functionality and comfort of vehicle seat systems by improving sensitivity to strain and bending under varying loads.
Implementation Method 1
the sensor construct includes a capacitive sensor... Each capacitor is formed by a combination of a corresponding signal electrode and a corresponding ground electrode with a corresponding dielectric layer positioned between the corresponding signal electrode and the corresponding ground electrode
Implementation Method 2
one or more dielectric layers... with a corresponding dielectric layer positioned between the corresponding signal electrode and the corresponding ground electrode
Data Source
AI summary
In an example, a vehicle seat sensor system includes a vehicle seat, a flexible seat sensor, and an electronics unit. The vehicle seat includes a seat surface. The flexible seat sensor is disposed within a deformable distance from the seat surface and includes one or more signal electrodes, one or more ground electrodes, one or more dielectric layers, and one or more capacitors. Each capacitor is formed by a combination of a corresponding signal electrode and a corresponding ground electrode with a corresponding dielectric layer positioned between the corresponding signal electrode and the corresponding ground electrode. The electronics unit is connected to the flexible seat sensor and is configured to electrically communicate with the flexible seat sensor. The flexible seat sensor is configured to provide a capacitive output proportional to an amount of pressure applied to the flexible seat sensor.