Ignition Interlock Power-Loss Monitoring for Tamper Detection

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Solution Overview

Problem

Vehicle ignition interlock systems are vulnerable to hacking and tampering, leading to spurious reports of driver violations and inaccurate notifications of IID circumvention attempts, which can result in wrongful penalties for drivers.

Innovation Solution

A method and system for detecting and reporting IID circumvention events by monitoring electrical parameters within the vehicle's power system, differentiating between instantaneous and gradual power losses to accurately identify and report only valid circumvention attempts, using a processor and memory to execute instructions for detecting, comparing, and reporting electrical parameters to a central monitoring server.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the IID system monitors all power interruptions as circumvention attempts, then detection sensitivity is improved, but false positive rate increases

Engineering Contradiction:

Improvecircumvention detection sensitivityVSAvoidfalse positive violations

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The system changes the parameter being monitored from simple presence/absence of power to the rate of power degradation. By measuring how quickly voltage degrades (instantaneous vs. gradual), the system can distinguish between intentional circumvention attempts and benign power failures, thereby maintaining high detection sensitivity while reducing false positives.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system introduces an intermediary analysis layer that examines the characteristics of power interruptions before triggering violation reports. This intermediary step analyzes the degradation rate and patterns of power loss, acting as a filter between the raw power monitoring data and the final violation determination, thus reducing false accusations.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If the IID system reports all detected circumvention attempts in real-time, then monitoring accuracy is improved, but reporting reliability deteriorates due to spurious reports

Engineering Contradiction:

Improveviolation reporting accuracyVSAvoidreport trustworthiness

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The system changes from reporting all power interruptions to reporting only those with specific characteristics (instantaneous degradation above threshold). This parameter-based filtering ensures that only high-confidence circumvention attempts are reported, maintaining reporting accuracy while preserving system reliability through selective reporting.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system incorporates feedback mechanisms that analyze the nature of power interruptions and determine whether they warrant reporting. By using feedback loops to evaluate degradation patterns and make intelligent reporting decisions, the system maintains high reporting accuracy while avoiding spurious reports that would undermine reliability.

Inventive Principle:

Principle #23Feedback

3Device complexity

If the IID system uses simple power presence detection, then device complexity is reduced, but measurement precision of circumvention attempts deteriorates

Engineering Contradiction:

Improvemonitoring system complexityVSAvoidpower interruption characterization

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The system replaces simple mechanical presence/absence detection with electrical parameter analysis. By using voltage degradation rate measurements instead of simple binary power detection, the system achieves higher measurement precision while maintaining relatively simple device architecture through software-based analysis of electrical characteristics.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS11827230B2Method and system of anti-circumvention monitoring in vehicle ignition interlock operation

Publication Date: 2023.11.28 CONSUMER SAFETY TECHNOLOGY LLC

AI summary

A system and method of detecting an anti-circumvention attempt associated with an ignition interlock device of a vehicle. The method comprises detecting an electrical parameter associated with an electrical power state of the vehicle electrical system that includes the ignition interlock device having at least a relay device and a controller device electrically interconnected within the vehicle electrical system; comparing, responsive to the detecting, the electrical parameter to a threshold condition; inferring an IID circumvention event in accordance with the electrical parameter being one of above and below the threshold condition, and reporting, responsive to the inferring, the IID circumvention event to a central monitoring server computing system.