Seat Occupancy Mat With Reference Capacitance Drift Compensation
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Solution Overview
Problem
Existing seat occupancy detection systems for motor vehicles face challenges in accurately determining the state of occupancy due to errors caused by environmental factors and the aging of components, leading to reduced reliability over time.
Innovation Solution
A detection mat system comprising a flexible support, interdigitated capacitive sensors, and conductive tracks connected to a computing unit, where the system determines the capacitance of the sensors by subtracting a reference capacitance from a measured capacitance, thereby improving accuracy and reducing environmental noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional capacitive sensors are used for seat occupancy detection, then the system can detect occupancy status, but measurement precision deteriorates over time due to environmental factors and component aging
Solution Approach 1:
The system continuously monitors the capacitance values from interdigitated capacitive sensors and compares them against reference values stored in memory. When deviations occur due to environmental factors or aging, the system uses the stored reference data to compensate and maintain accurate occupancy detection, creating a feedback loop that corrects drift over time
Solution Approach 2:
Reference capacitance values are pre-measured and stored in the memory device during system initialization or manufacturing. These preliminary reference values serve as a baseline for future comparisons, allowing the system to detect and correct deviations before they affect occupancy detection accuracy
2Adaptability or versatility
If interdigitated capacitive sensors are used, then occupancy detection is enabled, but environmental factors and aging cause measurement errors
Solution Approach 1:
The computing unit continuously compares current capacitance measurements with reference values stored in memory, detecting deviations caused by environmental factors or aging. The system uses this feedback to distinguish between changes due to environmental drift and changes indicating actual occupancy status
Solution Approach 2:
The memory device acts as an intermediary, storing reference capacitance values that serve as a stable reference point. This intermediary allows the system to separate environmental drift from actual occupancy signals by comparing current measurements against the stored reference
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 effectively enhances the accuracy of seat occupancy detection by minimizing errors from environmental and aging-related factors, thereby improving the reliability and longevity of the detection system.
Implementation Method 1
at least one interdigitated capacitive sensor borne by the flexible support
Data Source
AI summary
The present disclosure relates to a mat for detecting the occupancy of a motor vehicle seat, comprising a flexible support, an interdigitated capacitive sensor borne by the flexible support, a first conductive track borne by the flexible support, the first conductive track having a first end connected to the interdigitated capacitive sensor and a second end intended to be connected to a computing unit, a second conductive track borne by the support, the second conductive track having a first free end and a second end intended to be connected to the computing unit. The present disclosure also relates to a system for determining a capacitance, a method for determining a capacitance or a state of occupancy of a seat and a method for detecting a rotation of a part of the trunk of an occupant seated on a seat.