Vehicle Deactivated State Detection via Threshold Monitoring
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Solution Overview
Problem
Modern motor vehicles pose risks during scrapping due to pyrotechnic systems like airbags, and existing methods for safely deactivating these systems are vulnerable to cyber attacks, which can lead to incorrect detection of the vehicle's operating state, potentially causing accidents.
Innovation Solution
A method that reliably determines a deactivated operating state by analyzing operating parameters over a predefined period, using a user interface connected to the vehicle's network, which checks if the parameters have consistently remained below or above specified thresholds, making it robust against cyber attacks by considering the duration rather than instantaneous values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If instantaneous operating parameter values are used to determine vehicle state, then the detection speed is fast, but the reliability is reduced due to vulnerability to cyber attacks
Solution Approach 1:
The system performs preliminary actions by continuously monitoring and storing operating parameter values over a predetermined time period before making a determination. This preparatory data collection enables reliable detection by comparing historical data against threshold values, ensuring that the vehicle is truly in a stationary state before enabling pyrotechnic component deactivation.
Solution Approach 2:
The system implements feedback by continuously comparing current operating parameter values against previously stored values and threshold criteria. The determination of vehicle stationary state is based on feedback from multiple parameter checks over time, ensuring that cyber attack manipulations are detected and rejected through inconsistent parameter patterns.
2Reliability
If operating parameters are monitored over a predetermined time period, then the reliability against cyber attacks is improved, but the detection time increases
Solution Approach 1:
The system applies partial action by monitoring only the essential operating parameters required for stationary state determination rather than all possible vehicle parameters. The predetermined time period is set to the minimum necessary duration to detect cyber attacks, balancing reliability improvement with time loss minimization.
3Measurement precision
If multiple operating parameters are checked against threshold values, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The system achieves universality by using a single control device that performs multiple functions: it monitors various operating parameters, stores values over time, compares parameters against threshold criteria, and determines vehicle stationary state. This multi-functional approach improves measurement precision through comprehensive parameter checking while avoiding the complexity of multiple separate monitoring systems.
Data Source
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AI summary
When a motor vehicle is recycled, the following steps are carried out: a) receiving a signal (16) comprising an operating parameter of the motor vehicle (1), particularly speed; b) determining a moment when the operating parameter from the received signal (16) last exceeded a predeterminable threshold; c) recognising a deactivated operating state of the motor vehicle according to whether the determined moment is behind by more than a predetermined time interval (23); and d) issuing a triggering signal for the airbag.