In-Vehicle Relay Device Internal Abnormality Detection
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Solution Overview
Problem
Existing in-vehicle communication network relay devices cannot detect internal abnormalities, such as garbled data or processing failures, which can lead to continued operation in faulty states, affecting communication reliability.
Innovation Solution
Incorporation of a check frame generation unit and abnormality detection unit within the relay device to detect internal abnormalities by circulating a check frame and comparing pre- and post-processing frames for mismatches, timing deviations, or failure to acquire frames within predetermined thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay device operates without internal abnormality detection, then device complexity is reduced, but communication reliability deteriorates due to undetected garbled data or processing failures
Solution Approach 1:
The patent introduces a check frame as an intermediary element to detect internal abnormalities. The check frame circulates through the relay device and is compared between input and output to identify garbled data or processing failures without requiring complex monitoring systems. This mediator approach enables reliability improvement while keeping the added complexity minimal.
Solution Approach 2:
The relay device performs self-diagnosis by comparing its own input and output check frames. The abnormality detection unit uses the device's existing processing path to automatically detect internal failures, enabling the system to monitor itself without external intervention or additional complex monitoring infrastructure.
2Reliability
If check frame circulation is implemented, then internal abnormality detection capability is improved, but processing time increases due to additional comparison operations
Solution Approach 1:
The patent applies partial action by implementing abnormality detection only for check frames, not for all data frames. The abnormality detection unit selectively processes check frames to detect internal abnormalities, while normal data traffic flows through the relay device without additional processing. This selective approach minimizes time loss while maintaining detection capability.
3Measurement precision
If check frame comparison is performed, then detection precision for internal abnormalities is improved, but device complexity increases due to additional comparison unit
Solution Approach 1:
The patent uses copying by creating a duplicate check frame path through the relay device. The input check frame is copied and processed through the same relay path as normal data, then compared with the output check frame. This copying approach enables precise detection of internal abnormalities by comparing identical data before and relaying, while using simple comparison logic rather than complex analysis.
Data Source
AI summary
A relay device includes a plurality of ports, a medium access control unit, and a relay processing unit. Each of the plurality of ports provides a physical layer. The medium access control unit is connected to the plurality of ports. The medium access control unit receives a communication frame from one port out of the plurality of ports. The medium access control unit transmits the communication frame to another port out of the plurality of ports. The relay processing unit transmits, in cooperation with the medium access control unit and through the medium access control unit, the communication frame received from the medium access control unit to another port that corresponds to destination information included in the communication frame.