Vehicle Subsystem Misuse Detection via Error Frequency Monitoring
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Solution Overview
Problem
Existing methods fail to reliably detect improper tampering with subsystems in motor vehicles, such as coolant or safety systems, which can lead to uncorrected system errors and increased operating costs due to misuse, like excessive reduction agent consumption in SCR exhaust aftertreatment systems.
Innovation Solution
A diagnostic unit monitors subsystems during driving cycles, assessing the frequency of system error occurrences and corrections to determine misuse, activating a restricted operating mode if errors persist, and uses statistical methods to evaluate the frequency of events, including a misuse characteristic number to reliably detect and prevent unauthorized interventions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a diagnostic unit checks the subsystem for system errors during driving cycles, then system errors can be detected and displayed to the driver, but improper tampering or misuse cannot be reliably detected in individual cases
Solution Approach 1:
The diagnostic unit stores status information about system error occurrences and corrections in memory locations associated with successive driving cycles before conducting the misuse assessment. This preliminary storage of data enables the subsequent frequency-based evaluation to reliably distinguish between legitimate error patterns and improper tampering attempts.
Solution Approach 2:
The system continuously monitors the frequency of system error occurrences and corrections across multiple driving cycles, using this feedback to assess whether misuse is present. The diagnostic unit compares the observed frequency against expected patterns to determine if improper tampering has occurred, enabling reliable misuse detection that was not possible with single-instance checks.
2Reliability
If the restricted operating mode is activated after a predefinable number of driving cycles without error correction, then vehicle drivability is restricted to ensure error correction, but this may cause unnecessary restrictions if the error was temporarily deactivated without being eliminated
Solution Approach 1:
The diagnostic unit continuously evaluates the frequency of system error occurrences and corrections as feedback to determine whether to activate the restricted operating mode. By assessing whether the frequency pattern indicates misuse rather than legitimate temporary deactivation, the system can make more accurate decisions about when to restrict drivability, reducing unnecessary restrictions while maintaining safety.
Solution Approach 2:
The system changes the parameter of operating mode from normal to restricted based on the misuse assessment result. This parameter change is triggered not merely by the presence of an error but by the frequency-based determination that misuse is present, ensuring that drivability restrictions are applied appropriately rather than automatically for every error occurrence.
3Measurement precision
If statistical methods are used to assess the frequency of system error occurrences and corrections, then misuse can be detected with high reliability, but the device complexity increases due to additional memory and evaluation requirements
Solution Approach 1:
The diagnostic system is segmented into distinct functional components: memory locations for storing status information about each driving cycle, a frequency evaluation unit for assessing error occurrence patterns, and a misuse assessment unit for determining whether improper tampering is present. This segmentation allows the complex statistical evaluation to be implemented as a modular system, managing complexity through structured organization of functions.
Data Source
AI summary
A method for monitoring a subsystem installed in a motor vehicle involves a diagnostic unit checking the subsystem for system errors at least during driving cycles of the motor vehicle, the check being carried out for an occurrence as well as for a correction of a system error. The diagnostic unit carries out a misuse assessment based on a frequency of detection of the occurrence and/or the correction of the system error in order to determine whether the detected occurrence and/or the detected correction of the system error is/are based on misuse. If occurrence of the system error is detected, a restricted operating mode is activated or an activated restricted operating mode is continued in which drivability of the vehicle is restricted after a predefinable number of driving cycles has elapsed or after a predefinable travel distance has passed without the correction of the system error being detected.