Redundant CAN Transceiver Switching for Intermittent Open Wires
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Solution Overview
Problem
Intermittent open connections in CAN bus wires cause communication disruptions and safety issues, and existing redundancy solutions increase system complexity and cost.
Innovation Solution
A transceiver with redundant transmitter and receiver lines, a system monitor to detect errors, and a voltage adjustment circuit to generate bias voltages, ensuring communication continuity and safety by switching to redundant components when errors are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a parallel redundant CAN bus with redundant transceivers and chokes is provided, then reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple functions into a single transceiver device: the primary and secondary transceivers share common connection means (connector and choke), and the voltage adjustment circuit serves both transceivers. This merging approach provides redundancy while reducing overall system complexity compared to fully separate redundant systems.
Solution Approach 2:
The voltage adjustment circuit is designed to adjust bias voltages for both primary and secondary transceivers universally. The connection means (connector and choke) serve both the primary CAN bus path and the secondary redundant path, making these components multi-functional and reducing the need for dedicated redundant components.
2Reliability
If a parallel redundant CAN bus with redundant transceivers and chokes is provided, then reliability is improved, but cost increases
Solution Approach 1:
The patent merges shared components (connection means including connector and choke, and voltage adjustment circuit) into the redundant system architecture. This reduces the total quantity of components needed compared to completely separate primary and secondary systems, thereby reducing cost while maintaining reliability through redundancy.
Solution Approach 2:
The connection means and voltage adjustment circuit are designed as universal components that serve both primary and secondary transceivers. This multi-functionality reduces the total component quantity required, as these components are not duplicated but rather shared between the primary and redundant paths.
Data Source
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AI summary
A transceiver is disclosed. The transceiver includes a first receiver line, a first transmitter line, a second receiver line, and a second transmitter line, wherein the first receiver line and the second receiver line are coupled to a receiver line selector and the first transmitter line and the second transmitter line are coupled to a transmitter line selector. A system monitor is included that is configured to monitor a controller area network (CAN) bus and the first transmitter line and to select the second transmitter line and the second receiver line if an error condition is detected through the monitoring of the first transmission line. A bias voltage generator is included to generate a bias voltage for a terminating capacitor of the CAN bus, wherein the bias voltage generator is activated by the system monitor when an error condition is detected in the CAN bus.