CAN Bus Transceiver Fault Detection Circuitry
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Solution Overview
Problem
Current CAN bus transceivers lack effective fault detection capabilities, requiring service technicians to manually identify and diagnose faults in CAN bus systems, which is time-consuming and labor-intensive.
Innovation Solution
Integration of CAN bus fault detection circuitry within the transceiver that measures voltage and current to determine fault types and uses a time-domain reflectometer to determine the distance to faults, providing detailed information to technicians for error correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual fault checking is performed by service technicians, then fault detection capability is provided, but time consumption and labor intensity increase significantly
Solution Approach 1:
The CAN bus transceiver performs self-diagnosis by automatically detecting faults on the CAN bus and generating fault indication information without requiring manual intervention. The transceiver monitors voltage and current measurements, determines fault types, and provides diagnostic data to technicians, enabling the system to serve its own diagnostic needs.
Solution Approach 2:
The patent replaces manual mechanical fault checking with electronic automated detection. Instead of technicians physically inspecting connections and wiring, the system uses electronic fault detection circuitry within the transceiver to automatically identify faults, substituting human labor with electronic measurement and analysis systems.
2Device complexity
If no fault detection capability is provided, then device complexity is reduced, but fault diagnosis becomes tedious and labor-intensive
Solution Approach 1:
The fault detection circuitry is integrated within the CAN bus transceiver itself, merging the diagnostic function with the existing communication interface. This consolidation allows fault detection capabilities to be added without requiring separate standalone diagnostic equipment, maintaining operational simplicity while enhancing diagnostic functionality.
Solution Approach 2:
The transceiver acts as an intermediary between the CAN bus and the service technician, automatically performing measurements and providing processed fault information. Instead of technicians directly investigating complex wiring issues, the transceiver mediates by converting physical fault conditions into interpretable diagnostic data.
3Measurement precision
If detailed fault information is provided, then fault diagnosis accuracy improves, but information processing complexity increases
Solution Approach 1:
The patent extracts only the essential diagnostic information needed for fault identification and presents it in a simplified format to technicians. Instead of overwhelming users with raw measurement data, the system extracts key fault indicators and characteristics, providing precision where needed while maintaining overall system simplicity.
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
Simplifies the fault diagnosis process by providing detailed fault information and distance measurements, reducing the time and effort required to identify and correct faults in CAN bus systems.
Implementation Method 1
A time-domain reflectometer monitors the CAN bus signals for transmitted and reflected signals and from them a distance to the fault is determined
Data Source
AI summary
A CAN bus transceiver includes CAN bus fault detection circuitry that can provide detailed information to simplify the task of the service technician when there is a CAN bus fault. Voltage and current measurements of the CAN bus are made and from them a fault type is determined. A time-domain reflectometer monitors the CAN bus signals for transmitted and reflected signals and from them a distance to the fault is determined. Either or both values are provided to a service technician to allow error determination and correction.