In-Vehicle Device Parallel Ethernet CAN Transmission
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Solution Overview
Problem
Existing in-vehicle communication systems face challenges in maintaining stable communication networks due to failures in Ethernet or CAN networks, leading to potential data duplication and increased noise resistance issues.
Innovation Solution
The system employs in-vehicle devices connected to both Ethernet and CAN networks, allowing parallel transmission of information and automatic switching between networks upon detection of abnormalities, with sequence number detection to prevent data duplication, and prioritizing critical control information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If information is transmitted through a single network path, then the communication system is simple, but communication stability deteriorates when network failure occurs
Solution Approach 1:
The communication system is segmented into multiple independent network paths (Ethernet and CAN bus), each capable of transmitting control information separately. This segmentation allows the system to switch between paths during failures without requiring complex reconfiguration, thereby improving reliability while keeping the complexity manageable through modular architecture.
Solution Approach 2:
The system dynamically switches between Ethernet and CAN bus based on real-time network status. When a failure is detected in one network, the controller automatically transitions to the other network for transmitting control information. This dynamic adaptability ensures continuous communication stability without requiring permanent complex redundant configurations.
2Reliability
If parallel transmission through multiple networks is implemented, then communication reliability improves, but data duplication and processing complexity increase
Solution Approach 1:
The system extracts and transmits only essential control information through parallel network paths, filtering out redundant data. By selectively transmitting only necessary control signals through both Ethernet and CAN bus, the system achieves high reliability for critical control while minimizing data duplication and processing complexity.
Solution Approach 2:
The controller预先 (in advance) configures both Ethernet and CAN bus for parallel transmission capability and maintains readiness to switch between them. This preliminary preparation ensures that when failures occur, the system can immediately activate backup paths without complex real-time decision-making, thereby reducing processing complexity during critical moments.
3Reliability
If automatic network switching is implemented, then communication stability improves during failures, but detection and response time complexity increases
Solution Approach 1:
The system continuously monitors the operational status of both Ethernet and CAN bus through feedback mechanisms. When a failure is detected in one network, the controller receives feedback signals and automatically switches to the other network. This feedback-based approach simplifies failure detection by using direct status monitoring rather than complex diagnostic procedures, ensuring stable communication during failures.
Data Source
AI summary
An in-vehicle communication system includes a plurality of in-vehicle devices each being connected to an Ethernet network and a CAN (Controller Area Network). Each of the plurality of in-vehicle devices transmits and receives information to and from another in-vehicle device via the Ethernet network and the CAN. At least one of the plurality of in-vehicle devices is able to transmit the same information to the Ethernet network and the CAN in parallel.