Vehicle Alcohol Detection Sensor with Capacitive Driver Verification
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Solution Overview
Problem
In-car alcohol detection systems face challenges in accurately determining whether the finger presenting to the alcohol sensor is that of the driver, as intoxicated drivers may bypass the system by using a passenger or bystander to interface with the system, leading to false readings.
Innovation Solution
A capacitive coupling system and image processing are employed to ensure that the finger touching the alcohol detection sensor is connected to the driver, using a capacitive sensing electrode in the vehicle seat and a camera to verify the driver's identity and monitor the alcohol detection system, ensuring that only the driver can initiate the vehicle's operation and that the alcohol reading is valid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an alcohol detection system is implemented to prevent drunk driving, then driver safety is improved, but the system can be bypassed by intoxicated drivers using passengers or bystanders to interface with the sensor
Solution Approach 1:
The patent introduces a capacitive sensing electrode as an intermediary between the driver's body and the alcohol detection system. The electrode detects capacitive coupling from the driver's finger, creating a verification layer that confirms the person interfacing with the alcohol sensor is indeed the seated driver, not a passenger or bystander attempting to bypass the system
Solution Approach 2:
The system implements feedback by continuously monitoring capacitive coupling signals from the driver's finger on the sensing electrode. This feedback mechanism verifies in real-time that the correct person is interacting with the alcohol detection system, and can trigger warnings or disable vehicle operation if unauthorized individuals attempt to interface with the sensor
2Reliability
If capacitive coupling verification is added to confirm driver identity, then system security is improved, but device complexity increases
Solution Approach 1:
The capacitive sensing electrode serves multiple functions: it acts as a touch sensor for driver presence detection, verifies driver identity through capacitive coupling verification, and can trigger vehicle operation or warnings. This multi-functionality reduces the need for separate verification systems, thereby limiting the increase in overall device complexity
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 prevents false readings by confirming that the driver is the one interacting with the alcohol sensor, thereby ensuring the vehicle's ignition is only enabled when the driver is sober and seated, reducing the likelihood of circumvention.
Implementation Method 1
A capacitive coupling system and image processing are employed to ensure that the finger touching the alcohol detection sensor is connected to the driver, using a capacitive sensing electrode in the vehicle seat
Data Source
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AI summary
A system for disabling the operation of a vehicle when a driver of a vehicle is seated in a vehicle seat. The system includes an alcohol detection sensor configured to be contacted by the driver and to generate a detection signal based on contact between the driver and the detection sensor. The system also includes a sensing electrode located proximate to the occupant and a sensing circuit configured to provide a sensing signal to the sensing electrode. A controller is provided to detect a change in the detection signal resulting from contact between the driver and the detection sensor. The controller is configured to disable the vehicle when either the blood alcohol concentration of the driver of the vehicle exceeds a threshold or the controller does not detect a change in the detection signal resulting from contact of the driver with the detection sensor.