In-Vehicle Time Sync Queueing for Stable Grandmaster Switching
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Solution Overview
Problem
Frequent switching of the grand master device for time synchronization in in-vehicle networks can lead to instability in reference time and disrupt normal time synchronization between devices.
Innovation Solution
An in-vehicle device with a communication unit that prioritizes storing and transmitting time synchronization information in a dedicated queue, allowing for stable time synchronization by distinguishing and prioritizing Sync messages and Pdelay_Resp frames, and a monitoring unit to determine reference device switching based on reception status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If frequent switching of grand master device is performed to maintain time synchronization, then time synchronization adaptability is improved, but reference time stability deteriorates
Solution Approach 1:
The system performs preliminary evaluation of time synchronization information quality before switching grand master devices. By assessing the stability and reliability of reference time sources in advance, the system avoids frequent switching and maintains reference time stability while still adapting to abnormal conditions when necessary.
Solution Approach 2:
The system implements feedback mechanisms to monitor the quality and stability of time synchronization information from multiple reference devices. This feedback enables intelligent decision-making about when to switch grand master devices, balancing adaptability with stability by only switching when truly necessary based on monitored conditions.
2Reliability
If time synchronization information is prioritized in transmission queue, then time synchronization reliability is improved, but network communication complexity increases
Solution Approach 1:
The patent applies local quality by creating a dedicated high-priority queue specifically for time synchronization information within the network communication system. This localized treatment ensures that time synchronization packets receive preferential handling without requiring complete restructuring of the entire network communication architecture, thus improving reliability while limiting the increase in complexity to a manageable scope.
Data Source
AI summary
The in-vehicle device for receiving time synchronization information transmitted from each of a plurality of reference devices and transmitting the received time synchronization information to another device, includes: a communication unit configured to communicate with the other device; and an information processing unit configured to, if the communication unit receives a frame in which the time synchronization information is stored, store the time synchronization information in a specific queue with priority over other information, wherein the communication unit transmits the time synchronization information stored in the specific queue to the other device.