Vehicle Control Data Sampling for Memory Life and Crash Analysis
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Solution Overview
Problem
Conventional vehicle control systems face inefficiencies in data storage and sampling frequency, particularly during normal driving conditions, which can lead to reduced storage capacity and lifespan of external memory when sudden events occur, as they switch to high-frequency data collection only upon accident detection.
Innovation Solution
A vehicle control system comprising a storage buffer unit, a sampling period change unit, and a storage control unit that dynamically adjusts the sampling period based on the vehicle's driving state, storing control instruction data in a non-volatile memory at varying frequencies to extend memory life and prepare for potential accidents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If data are collected and stored at a high frequency during normal driving, then detailed driving data are available for analysis, but the storage capacity of external memory is consumed quickly and the life of external memory is reduced
Solution Approach 1:
The patent applies dynamics by making the sampling frequency adjustable based on driving conditions. The system dynamically changes the sampling frequency from a first frequency during normal driving to a second (higher) frequency during abnormal conditions, optimizing both memory usage and data quality according to actual needs
Solution Approach 2:
The system changes the parameter of sampling frequency based on detected driving states. When abnormal conditions are detected (such as sudden acceleration, deceleration, or steering), the system switches to a higher sampling frequency to capture detailed accident data, otherwise using a lower frequency to conserve memory
2Duration of action of stationary object
If data are collected and stored at a low frequency during normal driving, then storage capacity is preserved and memory life is extended, but insufficient data are available for detailed accident analysis when needed
Solution Approach 1:
The system performs preliminary action by continuously monitoring driving states and detecting abnormal conditions before accidents occur. This allows the system to proactively switch to high-frequency sampling when needed, ensuring detailed data is captured at the critical moment while maintaining low-frequency sampling during normal operation
Solution Approach 2:
The sampling frequency is made dynamic rather than fixed, allowing the system to adapt to different driving conditions. This resolves the contradiction by using low frequency during normal driving to extend memory life, then switching to high frequency when abnormal conditions are detected to ensure detailed accident data is captured
3Duration of action of stationary object
If the sampling frequency is switched to high frequency only upon accident detection, then memory life is extended, but data collection is delayed until after the accident signal occurs
Solution Approach 1:
The system performs preliminary monitoring of driving states to detect abnormal conditions that may precede or accompany accidents. By detecting these abnormal states in advance, the system can switch to high-frequency sampling proactively, capturing data before the actual accident occurs rather than waiting for post-accident signals
Solution Approach 2:
The system uses feedback from continuous monitoring of driving states (acceleration, deceleration, steering angle) to dynamically adjust sampling frequency. This feedback mechanism allows the system to respond to changing conditions in real-time, switching to high-frequency sampling when abnormal patterns are detected, thus capturing critical data without excessive memory usage during normal operation
Data Source
AI summary
In a vehicle control system, a sampling period change unit changes a sampling period such that the sampling period is made shorter, when a driving state of the vehicle becomes to have a higher possibility of accident as a result of driving control of the vehicle than when the driving state of the vehicle becomes to have a lower possibility of accident. A data storage control unit stores in an eMMC control instruction data stored in a temporary storage buffer in a non-volatile memory by sampling at the sampling period set by the sampling period change unit.