Motion-Sensitive Breath Analyzer Interlock for Vehicle Safety
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Solution Overview
Problem
Current ignition interlock devices for vehicles do not effectively prevent operation by individuals who have consumed alcohol, as they lack advanced features to ensure the breath sample originates from a human and do not adequately address the risk of sober friends starting the vehicle or the driver drinking while driving.
Innovation Solution
An interlock device that periodically prompts the driver for a breath sample, analyzes it for alcohol concentration, and activates alarms or immobilizes the vehicle if the sample is above the limit, using a combination of sensors to verify human origin and location-based prompt intensity, with an immobilizer circuit that gradually reduces vehicle speed or disables it if a sample is not provided promptly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a breath tester is installed to prevent operation by alcohol-consuming individuals, then driving safety is improved, but the device cannot verify whether the breath sample originates from a human being
Solution Approach 1:
The patent introduces motion sensors as an intermediary verification mechanism. The system monitors vehicle motion states and correlates them with breath sample timing. By verifying that the vehicle is in a consistent motion state between the prompt issuance and breath sample collection, the system indirectly verifies human presence and authenticity of the sample without requiring complex biometric sensors.
2Reliability
If random breath samples are required every 10 to 20 minutes, then deterrence of drinking while driving is improved, but the risk remains that a sober friend can start the vehicle and the driver can drink during operation
Solution Approach 1:
The system continuously monitors vehicle motion state and uses this feedback to dynamically adjust breath sample requirements. When motion is detected indicating the vehicle is being operated, the system issues breath sample prompts. The motion state feedback also helps distinguish between vehicle startup by an authorized operator versus potential unauthorized access, allowing the system to maintain security while permitting legitimate use.
Solution Approach 2:
The system performs preliminary motion state assessment before allowing vehicle operation. By monitoring motion patterns and correlating them with breath sample timing, the system establishes a baseline of legitimate operation patterns. This preliminary verification creates barriers against unauthorized startup while maintaining ease of operation for authorized users who follow normal procedures.
3Measurement precision
If the device requires breath samples only when the vehicle is at rest, then analysis accuracy is improved, but the device cannot prevent drinking while driving
Solution Approach 1:
The patent dynamically adjusts the breath sample collection protocol based on real-time motion detection. Rather than fixed rest-only sampling, the system issues breath sample prompts based on motion state transitions and operational patterns. This dynamic approach allows the system to maintain measurement accuracy by selecting appropriate sampling moments while simultaneously preventing drinking during driving through continuous motion-correlated monitoring.
Data Source
AI summary
Apparatus for use with a vehicle is disclosed and comprises an interlock device. The device is adapted to, in use: at least while said vehicle is in motion, periodically generate a prompt; assess motion of said vehicle; at least when said vehicle is assessed by said device to be at rest, carry out an analysis operation wherein a breath sample is received and analyzed; and in the event that, within a predetermined period following a prompt, the device does not, while said vehicle is assessed to be at rest, carry out said analysis operation, enter an alarm state at least when the vehicle is in motion. The device can be adapted to carry out analysis operations only when the vehicle is assessed to be at rest.