In-Vehicle Relay Device Failure Detection Packet Coordination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing in-vehicle network systems require multiple signal transmissions and receptions to determine communication state, which is time-consuming and inefficient, especially when determining communication status between end nodes.
Innovation Solution
A relay device directly connected to end nodes transmits failure detection packets and receives responses, sending a new packet with different values to determine communication status, reducing the number of transmissions and receptions required for each end node to determine the network's status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If end nodes transmit and receive multiple signals to determine communication state, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The relay device serves as an intermediary between end nodes, receiving failure detection packets from the control device and distributing them to end nodes. It also collects responses from end nodes and relays them back, reducing the time for communication state determination while maintaining accuracy through coordinated multi-node interaction
Solution Approach 2:
The relay device pre-establishes communication paths and prepares to distribute failure detection packets to multiple end nodes simultaneously. By having the relay device ready to coordinate communications in advance, the system reduces the time required for communication state determination without sacrificing measurement precision
2Device complexity
If end nodes determine communication state independently, then device complexity is reduced, but productivity decreases
Solution Approach 1:
The communication state determination function is segmented between the control device (generating failure detection packets), relay devices (distributing and collecting), and end nodes (responding). This segmentation allows each component to perform its function efficiently while maintaining overall system simplicity and high productivity
Solution Approach 2:
Relay devices perform multiple functions: receiving failure detection packets from the control device, distributing them to multiple end nodes, collecting responses from end nodes, and relaying responses back to the control device. This multi-functionality increases productivity without significantly increasing device complexity
3Reliability
If multiple transmission paths are used for communication state determination, then reliability is improved, but device complexity increases
Solution Approach 1:
Relay devices act as intermediaries that manage multiple communication paths between the control device and end nodes. By centralizing path management at the relay level, the system achieves high reliability through multiple paths while keeping the overall device complexity manageable through standardized relay functionality
Data Source
AI summary
A relay device directly connected to end nodes in an in-vehicle network transmits a failure detection packet to each end node. When each end node can receive the failure detection packet, each end node transmits a response to the relay device. When the relay device receives the response, the relay device transmits another failure detection packet. The end node determines that the in-vehicle network is normal when the value of the previous failure detection packet does not match the value of the other failure detection packet, and determines that the in-vehicle network is not normal when the value of the previous failure detection packet matches the value of the other failure detection packet.