CAN Communication Line Failure Estimation Using Protocol Error Flags
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Solution Overview
Problem
Existing detection devices for communication lines in CAN protocol-based systems face complexity in failure analysis due to excessive data acquisition, leading to cumbersome processing.
Innovation Solution
An estimating device that acquires and analyzes specific detection items from communication devices, using relation information to estimate failure modes without complex voltage-based analysis, associating detection items with failure modes like short-circuiting or disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time-series voltage data of the communication line is acquired over a certain period, then the failure detection capability is improved, but the data amount becomes excessively great and analysis becomes complicated
Solution Approach 1:
The invention extracts only the necessary detection items (error counters and protocol error flags) from the communication devices, rather than acquiring all time-series voltage data. This extraction approach obtains sufficient information for failure detection while avoiding the complexity of processing excessive data volumes.
Solution Approach 2:
The invention segments the failure detection task by dividing it into specific detection items (error counters for bit errors, form errors, stuff errors, ACK errors, and protocol error flags) that can be independently acquired and analyzed. This segmentation allows focused analysis on critical parameters rather than processing entire voltage time-series datasets.
2Difficulty of detecting and measuring
If voltage-based analysis is performed to detect communication line failures, then detection capability is improved, but processing becomes excessively complicated
Solution Approach 1:
The invention introduces communication protocol error detection mechanisms as intermediaries between the physical voltage signals and the failure analysis. The communication devices detect protocol-level errors (bit errors, form errors, stuff errors, ACK errors) and report them via error counters and flags, simplifying the detection process by operating at the protocol layer rather than directly analyzing voltage waveforms.
Solution Approach 2:
The invention replaces the mechanical/voltage-based detection system with an information-based detection system. Instead of analyzing physical voltage characteristics, the system uses digital error counters and protocol error flags that are automatically generated by communication devices, substituting complex voltage analysis with simpler data processing.
Data Source
AI summary
The estimating device estimates a failure mode of a communication line in a communication system including a plurality of communication devices in which communication based on a CAN protocol is performed via a communication line. The estimating device includes a storage device and an execution device. The storage device stores relation information including error information including a plurality of types of detection item DE related to a communication protocol error, and a failure mode associated with each detection item DE. The processor is configured to acquire a DE of detection items related to a communication protocol error. The execution device estimates that the failure has occurred in the failure mode associated with the acquired detection item DE.