Driving Data Recorder Memory Segmentation for Extended Event Context
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Solution Overview
Problem
Existing systems fail to adequately capture and analyze vehicle data before and after an event during travel, limiting the ability to fully understand the event's details.
Innovation Solution
A driving data recorder that utilizes two nonvolatile memories and a processor to store and copy driving data periodically and upon event detection, allowing for extended data capture and transmission based on event type and data volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If driving data is stored only for a short period in volatile memory, then the system can operate with limited memory resources, but insufficient data before and after events can be recorded for analysis
Solution Approach 1:
The memory system is segmented into three distinct parts: volatile memory for active data buffering, first nonvolatile memory for periodic snapshots, and second nonvolatile memory for event-focused extended recording. This segmentation allows each memory type to serve its optimal function while collectively solving the data retention problem.
Solution Approach 2:
The system performs preliminary actions by continuously buffering data in volatile memory and periodically copying it to nonvolatile memory before events occur. This ensures that when an event is detected, the necessary historical data is already prepared and available for extended analysis.
2Reliability
If driving data is copied frequently to nonvolatile memory, then data retention is improved, but memory bandwidth and processing time are consumed
Solution Approach 1:
The system implements periodic action by copying driving data from volatile memory to the first nonvolatile memory at predetermined intervals. This periodic copying ensures data retention without requiring continuous processing, thereby balancing reliability with time efficiency.
3Loss of information
If driving data for extended periods is recorded including event timing, then event analysis capability is enhanced, but data transmission volume increases
Solution Approach 1:
The system extracts and prioritizes event-related data from the extended recording period. By identifying events and selectively preserving data surrounding them in the second nonvolatile memory, the system maintains comprehensive event context while enabling selective transmission of only the most relevant data portions.
Data Source
AI summary
A driving data recorder includes a processor configured to store driving data of a vehicle in a volatile memory, copy, every time a first period elapses, the driving data for the first period stored in the volatile memory into one of a first nonvolatile memory and a second nonvolatile memory, and copy driving data for a second period, out of the driving data stored in the one of the nonvolatile memories, from the one of the nonvolatile memories into the other nonvolatile memory at saving timing that is a predetermined time after timing of detection of occurrence of a predetermined event. The second period includes the timing of detection of occurrence of the event and is longer than the first period.