Electronic Control Unit Anomaly Detection Using Reception Interval Accumulation

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Solution Overview

Problem

In vehicle communication systems, the accuracy of anomaly detection in data frames is compromised due to time stamp deviations, leading to erroneous determinations and increased memory consumption from storing reception times of all messages.

Innovation Solution

An electronic control unit with a reception unit, reception interval calculation unit, determination value updating unit, and anomaly determination unit, which calculates and updates a determination value based on the reception interval of data frames to accurately determine anomalies without storing reception times, thereby reducing memory consumption and erroneous determinations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If reception times of all messages are stored to detect anomalies, then anomaly detection accuracy is improved, but memory consumption increases

Engineering Contradiction:

Improveanomaly detection accuracyVSAvoidmemory consumption

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent extracts only the essential information needed for anomaly detection (reception time of current message and previous message) from the complete message data, storing only these time values in memory rather than all message contents, thereby reducing memory consumption while maintaining detection accuracy

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent transforms the anomaly detection approach from storing complete message records (high-dimensional data) to storing only reception time intervals (low-dimensional data), achieving the same detection purpose with significantly reduced memory requirements

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Productivity

If time stamp deviations are not corrected, then processing speed is maintained, but anomaly detection accuracy deteriorates due to erroneous determinations

Engineering Contradiction:

Improveprocessing speedVSAvoidanomaly detection accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent performs preliminary correction of time stamp deviations by calculating the deviation amount from expected reception times and applying compensation before anomaly detection, ensuring accurate detection without requiring reprocessing

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback by comparing actual reception times with expected times based on communication intervals, using the deviation information to adjust and improve subsequent anomaly detection accuracy

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11140052B2Electronic control unit, non-transitory tangible computer readable medium, and anomaly detection method

Publication Date: 2021.10.05 DENSO CORP

AI summary

In an anomaly detection by an electronic control unit connected to an other electronic control unit via a communication network, a data frame is received from the other electronic control unit, and a reception interval is calculated between a first data frame and a second data frame received immediately before the first data frame. A determination value for determining whether the data frame is anomalous is updated by adding a predetermined value to the determination value when the reception interval is equal to or less than a threshold value, and the data frame is determined to be anomalous when the determination value exceeds a limit value.