Vehicle Storage Refresh Control for Power-Off Data Retention
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Solution Overview
Problem
Existing vehicle systems face challenges in retaining data stored in high-capacity storage devices, particularly when power is terminated, due to the electrical properties of memory cells and temperature sensitivity, leading to potential data loss and excessive power consumption.
Innovation Solution
A vehicle control device and storage device system that manages power consumption by determining an initial retention expected period based on temperature and cell state, selectively performing refresh operations to maintain data integrity while minimizing battery drain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the storage device is left in a powered-off state to reduce power consumption, then power consumption is reduced, but data retention capability deteriorates due to electrical properties of memory cells
Solution Approach 1:
The system implements periodic refresh operations at predetermined time intervals instead of continuous operation. The controller determines an initial retention expected period based on temperature and cell state, then performs refresh operations periodically before this period elapses, achieving both power savings and data retention.
Solution Approach 2:
The system performs preliminary actions by determining the retention expected period in advance based on temperature and memory cell state before power-off. This allows the system to plan refresh operations proactively, ensuring data integrity while minimizing unnecessary power consumption.
2Reliability
If refresh operations are performed frequently to maintain data integrity, then data retention capability is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts the refresh operation schedule based on real-time temperature and memory cell state. By determining the retention expected period based on current conditions, the system optimizes refresh frequency to match actual data retention needs, avoiding both excessive and insufficient refresh operations.
Solution Approach 2:
The controller monitors temperature and memory cell state, uses this feedback to determine the retention expected period, and adjusts refresh operation timing accordingly. This closed-loop control ensures refresh operations are performed only when necessary for data integrity.
3Speed
If the storage device operates continuously to ensure data availability, then data access speed is improved, but power consumption increases
Solution Approach 1:
The system transitions between powered-off and powered-on states periodically based on operational needs and data retention requirements. During non-operational periods, the device remains powered-off to save energy, while refresh operations are scheduled to ensure rapid data availability when power is restored.
Data Source
AI summary
A vehicle control device includes a memory configured to store a vehicle control program; and a processor configured to execute the vehicle control program to: in response to a detection of operation termination of a vehicle, receive an initial retention expected period from a storage device of the vehicle; detect a period condition or a temperature condition before the initial retention expected period has elapsed after a power-off request for the storage device is provided; provide a power-on request to the storage device in response to residual capacity of a battery of the vehicle being equal to or exceeding a threshold level; control the storage device to determine a state of a memory cell; receive an updated retention expected period based on the state of the memory cell from the storage device; and selectively provide a refresh request to the storage device based on the updated retention expected period.