On-Vehicle Switching Device Failure Detection and Redundant Routing
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Solution Overview
Problem
In on-vehicle networks, existing redundant switching techniques are slow due to the proximity of noise sources like engines to signal lines, which deteriorates communication and can cause unexpected disconnections, making it difficult to maintain efficient communication.
Innovation Solution
A switching device with detection and processing units that rapidly identify communication failures and transmit failure information to other switches, allowing for swift redundant routing without the need for extensive handshaking, and includes a storage unit to determine the correct communication port for data transmission based on destination address and usage port information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If existing redundant switching techniques are used in on-vehicle networks, then communication reliability is maintained through redundancy, but switching speed becomes slow due to noise from engines and extensive handshaking requirements
Solution Approach 1:
The patent pre-establishes multiple communication routes and port mappings before failures occur. When a failure is detected, the system can immediately switch to a pre-planned alternative route without performing extensive real-time handshaking, thus achieving fast switching while maintaining reliability through pre-configured redundancy
Solution Approach 2:
The patent implements a failure detection mechanism that continuously monitors communication status and provides feedback to the switching control. When a communication failure is detected, the system receives feedback about the failed route and automatically selects an alternative pre-configured route, enabling rapid response while maintaining communication reliability through continuous monitoring and adaptive routing
2Loss of time
If extensive handshaking is performed for redundant switching, then communication reliability is ensured through proper protocol execution, but switching time increases significantly
Solution Approach 1:
The patent pre-configures multiple communication routes and establishes port mapping information in advance. When a failure occurs, the system can immediately activate a pre-planned alternative route without performing extensive real-time handshaking protocols, thus reducing switching time while maintaining protocol execution reliability through pre-validated routing paths
Solution Approach 2:
The patent allows the system to skip the extensive handshaking process by using pre-established routing information. Instead of performing complete protocol handshaking with the failed node, the system rapidly switches to an alternative pre-configured route, rushing through the failure recovery process while maintaining reliability through pre-validated alternative paths
Data Source
AI summary
A switching device relays data in an on-vehicle network and has a plurality of communication ports. The switching device comprises: a detection unit that detects a failure in communication with another switching device connected to one of the communication ports; and a processing unit that transmits failure information indicating at least any one of a site where the failure in communication occurs and a communication port to be used when the failure in communication occurs by a target switching device being a switching device different from said another switching device, to the target switching device if the failure in communication is detected by the detection unit.