Ignition Interlock Breath Analysis for False Lockout Prevention
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Solution Overview
Problem
Existing breath alcohol ignition interlock devices (IIDs) are prone to false positive results due to interferent breath components from non-ingested alcohol-containing substances, leading to incorrect vehicle lockouts.
Innovation Solution
A method and system that differentiate between alveolar breath components (from alcohol consumption) and interferent breath components by analyzing a time series of breath alcohol content (BrAC) measurements to estimate alcohol dissipation rates, determining a subset of measurements attributable to alveolar breath, and triggering the IID lockout state only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional breath alcohol content measurement is used to determine vehicle lockout, then the device can prevent intoxicated driving, but it produces false positive results due to interferent breath components
Solution Approach 1:
The patent segments the breath alcohol content measurement into two distinct components: alveolar breath component (from deep lung, indicating actual alcohol consumption) and interferent breath component (from mouth, indicating non-ingested substances). By separating these components through multi-level BrAC measurements and comparison, the system can identify and exclude false positives caused by interferent substances while maintaining reliable detection of actual intoxication.
2Reliability
If the IID triggers lockout based on any elevated BrAC measurement, then it prevents potential intoxicated driving, but it causes unnecessary vehicle lockouts from non-alcohol sources
Solution Approach 1:
The patent introduces an intermediary analysis layer between the raw BrAC measurement and the vehicle lockout decision. This intermediary process compares multiple BrAC measurements taken at different times and locations, estimates alcohol dissipation rates, and determines whether elevated readings are attributable to alveolar breath (actual intoxication) or interferent components (false positives). Only after this intermediary analysis confirms actual alcohol consumption does the system trigger vehicle lockout, thereby preventing unnecessary lockouts while maintaining safety.
3Reliability
If the system uses multiple BrAC measurements and analysis, then it reduces false positives, but it increases device complexity and processing requirements
Solution Approach 1:
The patent performs preliminary actions by taking multiple BrAC measurements at different locations (mouth and deep lung) before making the final lockout determination. It also performs preliminary estimation of alcohol dissipation rates using the time-series measurement data. These preliminary actions are built into the normal operation flow, allowing the system to distinguish alveolar from interferent components without requiring complex external equipment or post-processing analysis, thus managing complexity while maintaining high reliability.
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
Reduces false positive vehicle lockouts by accurately distinguishing between alcohol consumption and interferent sources, enhancing the reliability of IID operations.
Implementation Method 1
an alcohol-sensing element such as a fuel cell that measures alcohol content of the driver's breath
Data Source
AI summary
A method and a system of deploying an ignition interlock device (IID). The method comprises receiving a time series of breath alcohol content (BrAC) measurements that are unitarily sourced from a pre-identified user, each BrAC measurement of the time series including an alveolar breath component and an interferent breath component; estimating a dissipation rate of alcohol attributable to the pre-identified user in accordance with the time series of BrAC measurements; determining, responsive to estimating the dissipation rate of alcohol, at least a subset of the BrAC measurements as being based on the alveolar breath component but not the interferent breath component; and performing one of triggering and not triggering the IID into a lockout state based on the at least a subset of the BrAC measurements.