Optical Seat Occupancy Detection for Vehicle Warning Systems
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Solution Overview
Problem
Existing seat-belt warning systems for vehicles face complications in cabling and installation, especially in variable back-seat configurations with removable seats, and often fail to distinguish between occupants and objects, leading to unnecessary warnings.
Innovation Solution
A seat-belt warning device utilizing an optical imaging system with an image evaluation unit that can be integrated at any location within the vehicle, allowing for modular construction and distinguishing between occupants and objects, thereby eliminating the need for complex cabling and reducing the number of individual components by using a single system to monitor multiple seats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If seat occupancy sensors are integrated in the vehicle seats, then seat occupancy detection is achieved, but cabling complexity increases and installation becomes difficult in variable back-seat configurations
Solution Approach 1:
The patent replaces mechanical pressure-sensitive membrane switches with an optical imaging system (camera) to detect seat occupancy. The camera captures images of the passenger compartment, and image evaluation algorithms determine whether seats are occupied based on visual analysis, eliminating the need for mechanical sensors integrated in each seat and their associated cabling.
Solution Approach 2:
The optical imaging system serves multiple functions: it detects seat occupancy, distinguishes between occupants and objects, and can monitor multiple seats simultaneously from a central location. This multi-functional approach replaces the need for individual sensors in each seat, simplifying the overall system architecture and reducing cabling requirements.
2Reliability
If pressure-sensitive membrane switches are used in each seat, then seat occupancy is detected, but the system cannot distinguish between occupants and objects leading to false warnings
Solution Approach 1:
The patent replaces mechanical pressure sensors with an optical imaging system that captures visual information. Image evaluation algorithms analyze the captured images to distinguish between human occupants and inanimate objects based on visual characteristics such as shape, texture, and patterns, thereby improving classification accuracy and reducing false warnings.
Solution Approach 2:
The patent introduces an image evaluation unit as an intermediary between the camera and the warning system. This unit processes the captured images using pattern recognition and image analysis algorithms to accurately classify whether the detected object is a human occupant or an inanimate object, preventing false warnings while maintaining reliable occupancy detection.
3Measurement precision
If individual seat occupancy sensors are provided for each seat, then precise seat-level detection is achieved, but the number of components and system complexity increases
Solution Approach 1:
The patent employs a single optical imaging system that can monitor multiple seats simultaneously. The image evaluation unit processes the captured images to determine occupancy status for each individual seat, providing precise seat-level detection without requiring separate physical sensors for each seat, thereby reducing the total number of components while maintaining detection precision.
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 solution provides precise occupancy classification and situation-dependent warnings, reducing unnecessary alerts and simplifying installation, while enabling the use of a single system to monitor multiple seats and integrate with other vehicle features like headrests and emergency reporting systems.
Implementation Method 1
an optical imaging system having an image evaluation unit
Data Source
AI summary
The invention relates to a seat-belt warning device comprising a device which detects a seat occupied by a passenger, a device which detects whether the seat-belt associated with a seat is being used, and a device which emits a warning signal. According to the invention, the device which detects seat occupancy by a passenger comprises an optical image-producing system comprising an image evaluation unit.