CAN Transceiver Fault-Induced Mode Switching
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Solution Overview
Problem
Existing in-vehicle network (IVN) bus systems, such as CAN, face challenges in reliably transitioning all nodes to a single-ended communication mode when a fault occurs, ensuring synchronized communication across the network.
Innovation Solution
An apparatus, comprising a CAN transceiver, generates and transmits a reconfiguration signal with distinct signal properties to induce all nodes on the CAN bus to switch from differential to single-ended communication mode, using either the CANH or CANL wire based on the signal form received.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If differential signalling is used for communication, then communication reliability is improved, but the system cannot adapt when faults occur in the communication bus
Solution Approach 1:
The communication system dynamically switches between differential signalling mode and single-ended signalling mode based on fault conditions. The apparatus detects faults in the communication bus and reconfigures the signalling mode accordingly, making the system adaptable to different operational states while maintaining reliability
Solution Approach 2:
The system changes the electrical signalling parameters from differential voltage levels to single-ended voltage levels relative to a reference potential. This parameter change allows the system to continue communication when differential signalling becomes unavailable due to faults
2Reliability
If a reconfiguration signal is transmitted to switch communication mode, then fault tolerance is improved, but synchronized switching across all nodes becomes complex
Solution Approach 1:
The apparatus monitors the communication bus for fault conditions and uses this feedback to trigger reconfiguration signals. The system continuously detects bus health and adjusts communication mode accordingly, enabling automatic fault response without complex centralized control
Solution Approach 2:
Each apparatus on the bus independently detects faults and can autonomously initiate mode switching by transmitting reconfiguration signals. This self-service approach allows distributed nodes to handle faults independently, simplifying the overall system architecture while maintaining synchronized operation
3Adaptability or versatility
If single-ended communication mode is activated, then adaptability to faults is improved, but communication reliability may deteriorate compared to differential mode
Solution Approach 1:
The system prepares for potential faults by maintaining the capability to switch to single-ended mode. The reference potential establishment and mode switching mechanism are pre-configured, allowing the system to cushion against reliability deterioration by having a fallback communication path ready when differential mode fails
Data Source
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AI summary
An apparatus comprising a first and second terminal configured to couple the apparatus to a first and second bus wire of a communication bus; a transceiver arrangement for communicating with one or more network nodes via the communication bus, the transceiver arrangement configured to provide and receive differential signalling according to a communication scheme to/from the communication bus, wherein the communication scheme defines at least a voltage to be used to provide said differential signalling; the apparatus configured to: based on a fault detection signal indicative of the occurrence of a fault in at least the communication bus, transmit a reconfiguration signal for the network nodes and wherein at least part of the reconfiguration signal has a high-voltage-level comprising a voltage higher than that defined in the communication scheme for said differential signalling; and wherein said reconfiguration signal is configured to cause the network nodes to switch single-ended signalling.