CAN Transceiver Current Monitoring for Dominant Bit Fault Detection
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Solution Overview
Problem
Existing CAN transceivers lack robust mechanisms to detect and respond to errors in transmitter faults, particularly in sequences of consecutive dominant bits, which can lead to communication failures in CAN bus networks.
Innovation Solution
A CAN transceiver with integrated sensor units to measure transmitter current, detect dominant bits, and generate a control signal for fault detection, including shutdown mechanisms to address errors in transmitter operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional CAN transceivers are used without transmitter current monitoring, then the device complexity is reduced, but the reliability of fault detection deteriorates
Solution Approach 1:
The patent introduces sensor units as intermediary components that measure transmitter current without becoming part of the main signal path. These sensor units act as mediators between the transmitter and the evaluation unit, enabling fault detection through current monitoring while maintaining a clear separation of functions and minimizing interference with the primary CAN communication task.
Solution Approach 2:
The transceiver performs self-diagnosis by monitoring its own transmitter current through integrated sensor units and evaluation units. The system automatically detects fault conditions such as stuck dominant bits and generates control signals to shut down the transmitter when errors are detected, enabling the device to monitor and protect itself without external intervention.
2Reliability
If transmitter current monitoring is implemented to detect dominant bit errors, then the reliability of communication is improved, but the device complexity increases due to additional sensor units and evaluation logic
Solution Approach 1:
The evaluation unit serves multiple functions: it monitors transmitter current, detects dominant bit sequences, determines fault conditions, and generates control signals for transmitter shutdown. By consolidating these diverse functions into a single multi-functional evaluation unit, the patent reduces overall system complexity compared to having separate dedicated components for each function.
Solution Approach 2:
The patent replaces complex mechanical or circuit-based fault detection mechanisms with electrical current measurement and digital evaluation. Instead of using complicated signal analysis circuits or mechanical switches to detect transmitter faults, the system uses sensor units to measure current and an evaluation unit to digitally assess the current patterns, simplifying the overall detection mechanism.
3Stability of the object's composition
If error sequences of six consecutive dominant bits are detected and transmitter shutdown is triggered, then the network stability is improved, but the productivity of data transmission may be reduced due to frequent shutdowns
Solution Approach 1:
The patent applies preliminary anti-action by detecting error sequences and shutting down the transmitter before faulty signals can propagate extensively through the CAN network. By preemptively stopping transmission when six consecutive dominant bits are detected, the system prevents potential network-wide communication failures and maintains overall network stability, even though individual transmission sequences may be interrupted.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the reliability of CAN bus communication by accurately identifying and responding to transmitter faults, reducing interference and improving network security and stability.
Implementation Method 1
the transceiver is configured to measure an electrical current of the transmitter, referred to as a transmitter current
Data Source
AI summary
The present disclosure relates to a Controller Area Network, CAN, transceiver, comprising: a CAN BUS interface, a transmit data, TXD, interface, a receive data, RXD, interface, a receiver, and a transmitter, wherein the transceiver is configured to receive, via the TXD interface, from a CAN controller, a digital TXD transmit signal representing a frame, wherein the transmitter is configured to generate, at the CAN BUS interface, a BUS signal representing the bits of the frame in a sequence, wherein the transceiver is configured to measure an electrical current of the transmitter, to detect each dominant bit represented by the BUS signal based on the transmitter current, to detect an error sequence of at least six consecutive dominant bits being detected based on the transmitter current, and to generate a control signal representing a fault of the transmitter in response to a detected error sequence.