Rearview Mirror Breath Sensing With Driver Identity Verification

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Solution Overview

Problem

Traditional vehicle alcohol interlock systems require manual breath samples, which can spread germs and do not verify the identity of the person providing the sample, allowing impaired drivers to circumvent the system.

Innovation Solution

An interior rearview mirror assembly equipped with an alcohol sensing system that passively collects air samples and uses a driver monitoring camera to verify the source, integrating an electronic control unit to process sensor and image data to prevent vehicle operation if alcohol levels exceed a threshold.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If manual breath samples are collected using a mouthpiece and breath tube, then alcohol level detection is achieved, but germs are spread and the system can be circumvented by impaired drivers

Engineering Contradiction:

Improveaccuracy of alcohol detectionVSAvoidgerm transmission and system circumvention

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the mechanical breath tube and mouthpiece system with an optical sensing system. The alcohol detection is achieved through optical sensors that detect alcohol in the driver's breath without physical contact, eliminating germ transmission risks while maintaining detection accuracy.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces an intermediary optical sensing system between the driver and the detection mechanism. Instead of direct contact with a mouthpiece, the system uses optical sensors positioned in the mirror assembly to detect alcohol levels through the driver's breath condensation on the mirror surface, preventing both germ spread and system circumvention.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If a breath tube and mouthpiece system is used for alcohol detection, then the system is simple to implement, but it requires direct contact which spreads germs

Engineering Contradiction:

Improvesimplicity of system implementationVSAvoidgerm transmission

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent integrates the alcohol detection function into the existing rearview mirror assembly, making the system serve multiple purposes: rearview reflection and alcohol detection. This eliminates the need for separate breath tube hardware while adding sanitation benefits.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If traditional breathalyzer systems are used, then alcohol detection is achieved, but the system does not verify the identity of the person providing the sample

Engineering Contradiction:

Improvealcohol detection capabilityVSAvoiddriver identity verification

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent combines the alcohol detection system with the driver monitoring camera system already present in modern vehicles. The camera captures images of the driver's face, and this identity information is correlated with the alcohol detection data, ensuring that the detected alcohol level is attributed to the correct driver identity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The system uses feedback from the driver monitoring camera to verify that the person detected by the alcohol sensors is indeed the driver. The camera continuously monitors the driver's presence and identity, providing feedback to confirm that the alcohol detection is being performed on the correct individual before allowing vehicle operation.

Inventive Principle:

Principle #23Feedback

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

Provides a contact-free, accurate, and reliable method to detect and prevent vehicle operation by impaired drivers, reducing the risk of accidents and ensuring sanitary sample collection.

Implementation Method 1

The air sensing device captures sensor data representative of a sample of air at the vehicular component

Methodology Applied

Scientific EffectSensing:

Implementation Method 2

A driver monitoring camera captures image data representative of at least a head region of a driver of the vehicle

Methodology Applied

Scientific EffectImage capture: Photography

Data Source

PatentUS12447820B2Vehicular interior rearview mirror assembly with driver monitoring camera and driver breath analyzer

Publication Date: 2025.10.21 MAGNA MIRRORS HLDG

AI summary

A vehicular alcohol sensing system includes an air sensing device disposed at a vehicular component disposed at an interior portion of a vehicle. The air sensing device captures sensor data representative of a sample of air at the vehicular component. A driver monitoring camera is disposed in the vehicle and captures image data representative of at least a head region of a driver of the vehicle. The vehicular alcohol sensing system, based on processing by a data processor of sensor data captured by the air sensing device and based on processing by an image processor of image data captured by the driver monitoring camera, determines an alcohol level of the driver's breath. The vehicular alcohol sensing system, responsive to determining that the alcohol level of the driver's breath is above a threshold alcohol level, prevents operation of the vehicle.