Vehicle Seat Sensor Layout for User Classification and Discomfort Detection
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Solution Overview
Problem
Current seat monitoring systems lack the ability to accurately and ergonomically measure user anthropometric features and detect user types, such as children versus adults, and fail to effectively monitor lumbar and pelvic discomfort in real-time with sufficient precision and reliability.
Innovation Solution
A seat equipped with interdigital capacitive sensors and resistive electrodes integrated into measurement areas on the backrest and seating portion, allowing for precise distance and movement measurements, and combining these with pressure measurements to classify users and detect discomfort through a multiphysical single-technology device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional monitoring systems are used, then the system structure is simple, but the measurement precision and reliability of user classification is insufficient
Solution Approach 1:
The patent combines interdigital capacitive sensors and resistive electrodes into an integrated measurement system within the seat structure. This merging of multiple sensor types enables simultaneous measurement of distance, movement, and pressure, achieving accurate user classification (adult/child) and discomfort detection while maintaining a unified system architecture rather than separate monitoring systems
Solution Approach 2:
The measurement system serves multiple functions: it classifies users by type (adult/child), detects lumbar discomfort, monitors pelvic discomfort, and provides on-board diagnostic capabilities. This multi-functionality is achieved through the combination of capacitive sensors for distance/movement detection and resistive electrodes for pressure measurement, all integrated into the seat structure
2Measurement precision
If interdigital capacitive sensors are used, then the measurement precision and sensitivity are improved, but the device complexity increases
Solution Approach 1:
The patent replaces traditional mechanical pressure sensors with interdigital capacitive sensors that use electrical field-based measurement. This substitution enables high-precision detection of distance and movement through capacitance changes, achieving microsecond-level measurement speed and enhanced sensitivity while integrating the sensing function directly into the seat's structural components
3Reliability
If multiple sensor types are combined, then the reliability and redundancy of measurements are improved, but the manufacturing complexity increases
Solution Approach 1:
The patent merges interdigital capacitive sensors and resistive electrodes into a unified measurement system where both sensor types are integrated into the same seat structure. This combination provides redundant measurement capabilities - capacitive sensors for distance/movement and resistive electrodes for pressure - enhancing reliability through cross-validation while being manufactured as an integrated assembly
Solution Approach 2:
The system incorporates redundant sensor types that provide backup measurement capabilities. If one sensor type provides insufficient data or fails, the other sensor type can compensate, ensuring continuous reliable operation for user classification and discomfort detection throughout the vehicle's service life
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 provides a highly reliable and ergonomic system for user classification and discomfort monitoring, enhancing the accuracy and reliability of user detection and discomfort assessment, while also improving vehicle on-board diagnostic capabilities.
Implementation Method 1
an interdigital capacitive sensor is a sensor comprising at least one electrode which allows detecting a variation in distance, this distance possibly being very small, based on the capacitive effect. By virtue of this capacitive effect, a determination of the distance is obtained by measuring the capacitance of the capacitor
Implementation Method 2
a resistive electrode is any type of resistive sensor capable of measuring a pressure in the at least one measurement area of the seating portion and/or of the backrest of the seat, for example based on a variation in the resistivity of this element
Data Source
AI summary
A seat comprising a backrest; a seating portion connected to the backrest; and at least one measurement area defined on the backrest and/or on the seating portion, the at least one measurement area comprising at least one interdigital capacitive sensor capable of measuring a distance or a movement of a user occupying the seat.