Sensor Signal Correlation for Fault Detection

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Solution Overview

Problem

Existing sensor systems in vehicles face challenges in detecting security attacks and component failures reliably and cost-effectively, particularly due to limited cybersecurity protections in sensors and the need for expensive cryptographic measures.

Innovation Solution

A monitoring system that includes a sensor and a controller, where the sensor transmits electrical signals to the controller, and the controller measures the signal function response, correlates it with a reference response, and compares it to a threshold to detect faults, thereby identifying security attacks or component failures without requiring expensive cryptographic protocols.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If expensive cryptographic measures are used to protect sensor communications, then security and reliability are improved, but system cost increases

Engineering Contradiction:

Improvesecurity and reliabilityVSAvoidsystem cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces expensive cryptographic protection mechanisms with inexpensive signal analysis methods. The monitoring system uses simple correlation calculations on transmitted signals to detect attacks, eliminating the need for costly cryptographic hardware and software while maintaining security detection capability.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent substitutes cryptographic (software-based) security measures with a physics-based signal analysis approach. By monitoring the physical characteristics of electrical signals and their correlations, the system detects security breaches through physical signal properties rather than computational cryptography.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If cryptographic protocols are implemented in sensor systems, then security is improved, but device complexity increases

Engineering Contradiction:

ImprovesecurityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the security detection function from complex cryptographic protocols and implements it as a separate, simple signal monitoring system. The monitoring system independently analyzes signal correlations without requiring cryptographic processing, thereby reducing overall device complexity while maintaining security detection capability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces complex cryptographic processing with simple, computationally lightweight signal correlation analysis. This substitution dramatically reduces the processing power and memory requirements, simplifying the device architecture while effectively detecting security attacks.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Ease of manufacture

If simple monitoring methods are used without cryptographic measures, then system cost is reduced, but detection reliability deteriorates

Engineering Contradiction:

Improvesystem costVSAvoiddetection reliability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent implements a feedback-based signal monitoring system that continuously compares transmitted signals with expected signal characteristics. The system uses correlation analysis to provide real-time feedback on signal integrity, reliably detecting deviations caused by security attacks without requiring expensive cryptographic measures.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent establishes baseline signal characteristics and correlation thresholds in advance during system setup. This preliminary characterization of normal signal behavior enables the monitoring system to reliably detect attacks by comparing real-time signals against pre-established references, ensuring detection reliability without complex cryptographic protocols.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12309228B2Security and reliability detection for a sensor communication channel

Publication Date: 2025.05.20 INFINEON TECHNOLOGIES AG

AI summary

A monitoring system includes: a sensor configured to generate a sensor signal based on a measured property; a controller configured to communicate with the sensor; and a communication channel electrically coupled to the sensor and the controller for carrying electrical communications therebetween. The sensor includes a transmitter configured to transmit an electrical signal on the communication channel to the controller. The controller includes a processing circuit configured to receive the electrical signal, measure an actual signal function response of the electrical signal, correlate the actual signal function response with a reference signal function response to generate a correlation value, compare the correlation value and a correlation threshold to produce a comparison result, and detect a fault based on the comparison result indicating that the correlation value satisfies the correlation threshold.