Vehicle Switch Device Abnormality Detection and Bandwidth Optimization
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Solution Overview
Problem
On-vehicle network systems face inefficiencies due to discarded communication data when an ECU experiences abnormality, leading to retransmissions and wasteful use of communication bandwidth.
Innovation Solution
A switch device with a buffer and control unit that detects abnormal communication devices and sends stop requests to prevent data transmission, allowing data to be held and reducing retransmissions by identifying and addressing abnormality in the communication path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If communication data is continuously transmitted to all devices in the on-vehicle network, then communication bandwidth is fully utilized, but communication data is discarded when an ECU experiences abnormality leading to retransmissions and wasteful use of communication bandwidth
Solution Approach 1:
The control unit performs preliminary detection of device abnormalities before communication data is discarded. By detecting abnormalities in advance and proactively stopping transmission to abnormal devices, the system prevents communication data loss and avoids the need for retransmissions, thereby improving communication reliability while reducing bandwidth waste
Solution Approach 2:
The control unit continuously monitors the communication status and device health, providing feedback on abnormality detection. Based on this feedback, the system dynamically adjusts transmission behavior by stopping communication to abnormal devices and resuming when they recover, optimizing the balance between reliability and bandwidth efficiency
2Loss of energy
If communication data transmission is stopped to abnormal devices, then communication bandwidth waste is reduced, but additional control mechanisms are required to detect abnormalities and manage transmission
Solution Approach 1:
The control unit serves multiple functions: it manages normal communication routing, detects device abnormalities, decides when to stop transmission, and coordinates with other devices. By consolidating these diverse functions into a single control unit, the system achieves bandwidth efficiency without proportionally increasing overall system complexity
Solution Approach 2:
The control unit acts as an intermediary between the communication data source and the destination devices. It mediates the transmission process by intercepting abnormality information and making intelligent routing decisions, thereby simplifying the complexity management while achieving efficient bandwidth utilization
3Reliability
If retransmission of discarded communication data is performed, then data delivery reliability is maintained, but communication bandwidth is wasted due to redundant transmissions
Solution Approach 1:
The control unit takes preliminary anti-action by preventing communication data from being transmitted to abnormal devices in the first place. By detecting abnormalities beforehand and stopping transmission proactively, the system avoids the creation of discarded data that would otherwise require retransmission, thereby maintaining reliability while eliminating bandwidth waste
Data Source
AI summary
This switch device is mounted on a vehicle, and comprises: a switch unit for relaying communication data communicated between a plurality of communication devices; a buffer for holding the communication data to be relayed; and a control unit for transmitting stop request to at least one communication device of the plurality of communication devices if communication data to be transmitted to a communication device in which abnormality has been detected is held in the buffer, the stop request which requests for stopping transmission of communication data to the switch device and for holding of communication data to be transmitted to the switch device.