Vehicle Time Synchronization Abnormality Detection Under Delay Variation
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Solution Overview
Problem
Existing vehicle-mounted network systems face challenges in maintaining stable time synchronization due to sudden changes in data propagation delay times between devices, which can lead to decreased precision in synchronization.
Innovation Solution
A vehicle-mounted device equipped with a processing unit that requests and updates time information for data propagation delay times and performs time synchronization based on this information, while a detection unit identifies and records abnormalities related to time synchronization, enabling quick resolution of issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If time synchronization is performed based on data propagation delay time between vehicle-mounted devices, then time synchronization precision is improved, but sudden changes in propagation delay time cause synchronization stability to deteriorate
Solution Approach 1:
The system performs preliminary actions by detecting abnormalities in time synchronization before they significantly impact system operation. The detection unit continuously monitors synchronization status and identifies deviations from normal operation, allowing the system to take corrective actions in advance to maintain stable time synchronization across vehicle-mounted devices.
Solution Approach 2:
The system implements feedback mechanisms where the detection unit provides information about synchronization abnormalities back to the time synchronization process. This feedback loop enables the system to adjust its time synchronization behavior based on detected abnormalities, thereby maintaining both precision and stability even when propagation delay times change suddenly.
2Reliability
If abnormality detection and recording functions are added to the vehicle-mounted device, then reliability of time synchronization is improved, but device complexity increases
Solution Approach 1:
The detection unit and abnormality recording functions are merged into the existing vehicle-mounted device architecture, integrating time synchronization monitoring capabilities with the device's normal operation. This integration approach improves reliability without proportionally increasing device complexity, as the detection functions share hardware and software resources with other device functions.
Data Source
AI summary
Time synchronization is performed between the vehicle-mounted device and another device that is another vehicle-mounted device based on a data propagation delay time between the vehicle-mounted device and the other device. The vehicle-mounted device includes: a processing unit configured to receive, from the other device, request information that requests time information used for updating the propagation delay time, and transmit the time information to the other device; and a detection unit configured to detect an abnormality related to time synchronization, and acquire information regarding the detected abnormality.