In-Vehicle Network Path Deterioration Detection and Cause Discrimination
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Solution Overview
Problem
Existing technologies lack effective methods for accurately diagnosing and predicting deterioration of in-vehicle networks, and compensating for signal distortion in transmission lines, which are crucial for maintaining optimal communication performance.
Innovation Solution
An in-vehicle device equipped with a measurement unit to measure transmission path characteristics, an acquisition unit to gather deterioration information, and a determination unit to determine the deterioration degree based on measured characteristics and acquired information, along with a discrimination unit to identify factors of change or abnormality in the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transmission path characteristics are measured and deterioration information is acquired to determine deterioration degree, then diagnostic accuracy is improved, but device complexity increases
Solution Approach 1:
The system divides deterioration detection into separate functional modules: a measurement unit for acquiring transmission path characteristics, an acquisition unit for gathering deterioration information, and a determination unit for calculating deterioration degree. This segmentation allows each component to perform a specific function, improving measurement precision while managing complexity through modular design.
Solution Approach 2:
The in-vehicle device acts as an intermediary between the transmission path and the diagnostic system. It measures characteristics such as insertion loss and communicates this data to external systems, enabling accurate deterioration detection without requiring complex direct analysis of the transmission path itself.
2Reliability
If multiple characteristics are measured to identify specific deterioration factors, then diagnostic capability is improved, but measurement complexity increases
Solution Approach 1:
The measurement process is segmented into distinct characteristics: insertion loss measurement, temperature information acquisition, and elapsed time calculation. Each characteristic is measured independently by dedicated functional units, improving diagnostic capability through comprehensive data collection while managing measurement complexity through systematic division of measurement tasks.
Solution Approach 2:
The in-vehicle device performs multiple functions using the same measurement infrastructure: it measures insertion loss, acquires temperature data, and tracks elapsed time. This multi-functionality allows comprehensive deterioration factor identification without proportionally increasing measurement complexity, as the same hardware platform supports diverse measurement types.
3Reliability
If continuous monitoring of transmission path characteristics is implemented, then reliability is improved, but energy consumption increases
Solution Approach 1:
The system implements periodic monitoring of transmission path characteristics rather than continuous monitoring. The measurement unit periodically measures insertion loss and other characteristics at predetermined intervals, maintaining communication reliability through regular checks while reducing energy consumption by keeping the measurement system inactive between monitoring cycles.
Data Source
AI summary
An in-vehicle device includes: a measurement unit configured to measure a characteristic of a transmission path in an in-vehicle network mounted to the vehicle; an acquisition unit configured to acquire deterioration information which is information regarding deterioration of the transmission path and which corresponds to the characteristic measured by the measurement unit; and a determination unit configured to determine a deterioration degree of the transmission path, based on the characteristic measured by the measurement unit and the deterioration information acquired by the acquisition unit.