Vehicle Event Data Recording with Isolated Write Partitions
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Solution Overview
Problem
Existing methods for recording event data in highly automated vehicles lack efficient mechanisms to ensure data integrity and prevent unauthorized access or alteration, particularly during critical events.
Innovation Solution
A method and device that utilize a single write partition accessible only by one function, combined with a buffer block managing data frames in volatile memory and a data recording system for persistent storage in nonvolatile memory, ensuring data integrity and preventing unauthorized access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple functions access the write partition simultaneously, then data processing efficiency is improved, but data integrity and security deteriorate due to unauthorized access and alteration
Solution Approach 1:
The write partition is segmented into multiple sub-partitions, with each sub-partition accessible only to a specific function. This segmentation allows multiple functions to process data in parallel while maintaining data integrity, as each function is confined to its designated sub-partition and cannot access or alter other functions' data.
2Device complexity
If a single write partition is used for all functions, then device complexity is reduced, but data security and access control worsen due to lack of isolation
Solution Approach 1:
The write partition is divided into multiple isolated sub-partitions, each assigned to a specific function. This segmentation provides automatic access control and data isolation without requiring complex permission management systems, as the structural division itself enforces security boundaries.
Solution Approach 2:
Each sub-partition within the write partition has specialized local quality tailored to its specific function's requirements. This allows optimization of data storage and access patterns for each function while maintaining overall system simplicity through the uniform sub-partition structure.
Data Source
AI summary
A method for recording event data in a vehicle. Vehicle data are continuously received from at least one vehicle system and written as event data into data frames having a predefined size. The individual data frames are stored in at least one volatile memory. The stored data frames are managed and kept available in the at least one volatile memory until the event data stored in the individual data frames are older than a predefined maximum pre-event point in time, or are persistently stored in at least one nonvolatile memory in response to a recognized predefined event. Multiple partitions having a predefined size are provided, one of the partitions being determined, as a function of at least one write criterion, as the present write partition into which the received pieces of reference information of the individual data frames are written.