Alcohol Interlock Sensor Segmentation for Surrogate Measurement
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Solution Overview
Problem
Existing alcohol interlock devices face challenges in accurately measuring a driver's blood alcohol concentration due to difficulties in distinguishing between the driver and a fellow passenger, leading to potential surrogate measurement issues.
Innovation Solution
A device and method that utilize sensors to obtain position and breath information of a fellow passenger, determining whether they have invaded the driver's region, and re-measuring blood alcohol concentration based on these determinations to prevent incorrect measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alcohol interlock measurement is performed in a vehicle environment, then drunk driving prevention is achieved, but accurate measurement of driver's blood alcohol concentration cannot be ensured due to surrogate measurement by fellow passengers
Solution Approach 1:
The sensing region is divided into multiple distinct regions (driver region and fellow passenger region) to spatially separate the measurement zones. This segmentation allows the system to identify which region the exhaling person is located in, thereby preventing surrogate measurement by fellow passengers and ensuring accurate measurement of the driver's blood alcohol concentration.
Solution Approach 2:
Position information and breath information serve as intermediary parameters to determine the identity of the person being measured. By using these intermediate measurements (position detection and breath analysis), the system can verify whether the measured person is the driver or a fellow passenger, thus resolving the surrogate measurement problem.
2Measurement precision
If position information and breath information are analyzed to prevent surrogate measurement, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The sensor unit performs multiple functions: it detects both position information (to determine spatial location) and breath information (to analyze respiratory patterns). By making the sensor multi-functional, the system achieves accurate identification of the measured person without requiring separate dedicated devices for each function, thus managing complexity while improving precision.
Solution Approach 2:
The system uses the fellow passenger's own breath and position data to identify them as the source of measurement. The controller automatically analyzes the collected information and determines whether the measured person is the driver or fellow passenger without requiring external intervention, enabling self-identification and reducing operational complexity.
Data Source
AI summary
A device for controlling alcohol interlock according to an embodiment of the present disclosure includes a sensor for obtaining position information and breath information of a fellow passenger, and a controller that determines whether a blood alcohol concentration of the fellow passenger is measured based on the position information and the breath information of the fellow passenger, and determines whether to re-measure a blood alcohol concentration based on the determination result. Thus, the device may prevent surrogate measurement of the fellow passenger, so that a driver's own blood alcohol concentration may be measured accurately, and drunk driving of a driver may be fundamentally prevented.