Vehicular Data Recorder Crash Priority Logic
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Solution Overview
Problem
Existing vehicular data recording apparatuses struggle to reliably and efficiently record and retain necessary data for crash analysis, especially when multiple crashes occur in close proximity, and may face issues like data overwrite due to battery disconnection during batch writing.
Innovation Solution
A vehicular data recording apparatus that prioritizes data recording for crashes based on type, interrupting lower-priority crash recordings if a higher-priority crash is detected, using non-volatile memory and RAM for efficient data handling, and performing one-by-one write-in methods to ensure critical data is preserved.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If batch write-in method is used for data recording, then recording efficiency is improved, but data reliability deteriorates due to possible overwriting when battery disconnects during writing
Solution Approach 1:
The patent segments the data recording process into individual record-unit-level write operations instead of batch writing. Each sensor data point is written separately to the storage medium, allowing the system to complete individual writes before battery disconnection occurs, thus preventing data loss while maintaining reasonable recording efficiency
Solution Approach 2:
The patent implements preliminary buffering of sensor data in memory before writing to permanent storage. This preliminary action allows the system to accumulate data temporarily and write it in smaller, more manageable units that can be completed before battery disconnection, resolving the contradiction between batch writing efficiency and data reliability
2Loss of information
If data recording for all detected crashes is performed without priority, then completeness of recording is improved, but data reliability deteriorates due to potential overwriting when multiple crashes occur in close proximity
Solution Approach 1:
The patent applies local quality by assigning different priority levels to different crash types based on their severity and likelihood. Critical crashes receive higher priority for immediate recording, while less critical crashes are recorded with lower priority, ensuring that important data is preserved even when storage capacity is limited
Solution Approach 2:
The patent changes the parameter of recording priority dynamically based on crash characteristics. When multiple crashes are detected, the system adjusts the recording priority parameter according to the severity and type of each crash, ensuring that critical data is recorded first and preventing overwriting of important information
Data Source
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AI summary
A vehicular data recording apparatus includes crash detection means (12) for detecting a crash of a vehicle, and recording process means (14) for recording and retaining output data of various vehicle-mounted sensors (20, 30, 40, 50) mounted in the vehicle, in a non-volatile memory (70), wherein if a crash is detected by the crash detection means (12), a data recording/retaining process relevant to the crash is performed by the recording process means. If a plurality of crashes different in the crash form are detected continually in a short time by the crash detection means, the recording process means performs the data recording/retaining process relevant to each crash in accordance with a predetermined order of priority based on the crash form of each crash.