Vehicle Electronic Device Time Synchronization With Elapsed-Time Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing time synchronization methods do not account for elapsed time from the generation to transmission of timing synchronization messages, leading to reduced precision in time synchronization among electronic devices.
Innovation Solution
A vehicle control system that includes electronic devices with timer units, generation units, and transmission units to transmit time information and elapsed time information, allowing for precise time synchronization by adjusting time based on elapsed time measurements across multiple devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If elapsed time from generation to transmission of timing synchronization messages is not taken into consideration, then the time synchronization method is simple, but the precision of time synchronization deteriorates
Solution Approach 1:
The patent applies preliminary action by having the master control device measure and record the elapsed time from the moment the timing synchronization message is generated until it is transmitted. This pre-measurement of transmission duration allows the slave control device to compensate for this delay when calculating synchronized time, thereby improving precision without adding complex real-time measurement mechanisms during transmission.
Solution Approach 2:
The patent implements feedback by having the master control device transmit the measured elapsed time information along with the timing synchronization message to the slave control device. The slave device then uses this feedback information to adjust its time calculation, compensating for the transmission delay and achieving higher synchronization precision.
2Measurement precision
If elapsed time information is transmitted along with time information, then the precision of time synchronization is improved, but the communication traffic increases
Solution Approach 1:
The patent merges the transmission of time information and elapsed time information into a single communication process. The master control device includes both the timing synchronization data and the measured elapsed time within the same message transmission to the slave control device, thereby improving precision while minimizing additional communication overhead through consolidation.
Data Source
AI summary
Provided is a vehicle control system that includes a first electronic device, a second electronic device, and a third electronic device. The first electronic device includes: a first electronic device transmission unit that transmits time information counted by a first electronic device timer unit and first elapsed time information that is from the start of generation of the time information till transmission of the time information generated. The second electronic device includes a second electronic device transmission unit that transmits the time information and the first elapsed time information received from the first electronic device to the third electronic device. The third electronic device includes an adjustment unit that adjusts time counted by a third electronic device timer unit based on the time information and the first elapsed time information received.