In-Vehicle Packet Circulation for Abnormal Device Detection
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Solution Overview
Problem
Existing in-vehicle communication systems face challenges in reliably detecting abnormalities in in-vehicle devices, requiring complex monitoring processes that are not efficient for large networks.
Innovation Solution
An in-vehicle communication system with a switch device and abnormality detection method that circulates a target packet among multiple devices, allowing any device to detect abnormalities based on the packet's reception state, reducing the need for individual monitoring and simplifying the detection process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual monitoring processes are implemented for each in-vehicle device, then abnormality detection reliability is improved, but system complexity and processing load increase
Solution Approach 1:
Multiple in-vehicle devices are grouped into a monitoring group where they collectively monitor each other through packet circulation. Instead of individual devices performing separate monitoring tasks, the group shares the monitoring function by circulating a target packet among all members, thereby reducing individual device complexity while maintaining overall detection reliability.
Solution Approach 2:
Each in-vehicle device in the monitoring group is equipped with both communication functionality (for transmitting and receiving target packets) and detection functionality (for monitoring packet reception states). This multi-functionality allows devices to participate in mutual monitoring without requiring separate dedicated monitoring hardware or complex individual monitoring processes.
2Reliability
If comprehensive monitoring of all in-vehicle devices is implemented, then abnormality detection coverage is improved, but processing load increases
Solution Approach 1:
The target packet circulates periodically among the in-vehicle devices in the monitoring group. Each device transmits the packet to the next device in sequence at regular intervals, creating a periodic monitoring cycle. This approach ensures comprehensive coverage of all devices while distributing the processing load evenly over time, as each device only needs to handle packet transmission and reception at specific periodic moments rather than continuously.
Solution Approach 2:
Each in-vehicle device monitors its own reception state of the target packet and autonomously determines whether an abnormality exists based on whether it successfully receives the packet from the previous device. This self-service approach allows devices to perform detection independently without requiring centralized coordination or additional processing overhead from a central controller, thereby improving processing efficiency while maintaining comprehensive monitoring coverage.
Data Source
AI summary
An in-vehicle communication system is provided with an in-vehicle device group including four or more in-vehicle devices. A specific in-vehicle device group, which is a part of the in-vehicle device group and includes three or more specific in-vehicle devices being the in-vehicle devices, circulates a specific target packet. A first in-vehicle device being the specific in-vehicle device performs a detection process of detecting abnormality of a specific in-vehicle device, other than the first in-vehicle device, in the specific in-vehicle device group, based on a reception state of the target packet.