In-Vehicle Control System Non-Powered Data Retention
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Solution Overview
Problem
Existing in-vehicle control systems fail to effectively store useful analysis data for diagnosing abnormal vehicle symptoms in backup storage, particularly when the system is not powered, leading to loss of critical data for analyzing abnormalities.
Innovation Solution
An in-vehicle control system with a processing unit, first storage capable of powered-state data storage, and a second storage capable of both powered and non-powered state data storage, which acquires and stores vehicle signals, diagnostic results, and time information at predetermined intervals, allowing for the backup of analysis data even when the system is not powered.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the in-vehicle control apparatus uses a backup storage that can only store data during powered state, then the device complexity is reduced, but the reliability of data retention is worsened when the system is not powered
Solution Approach 1:
The storage system is divided into two distinct parts: a first storage unit for temporary data storage during powered state, and a second storage unit for permanent data retention during non-powered state. This segmentation allows each storage unit to have optimized characteristics for its specific function, resolving the contradiction between simplicity and reliability.
Solution Approach 2:
The processing unit acts as an intermediary that transfers data from the first storage to the second storage when abnormalities are detected. This intermediary mechanism ensures that critical data is preserved across power states without requiring the storage system itself to be complex, maintaining reliability while keeping the overall system manageable.
2Quantity of substance
If the in-vehicle control apparatus stores all detection data in backup storage, then the quantity of stored data is increased, but the loss of useful information is worsened due to storing ineffective data
Solution Approach 1:
The system extracts and stores only the essential detection data related to abnormality conditions in the second storage unit, while discarding or not storing ineffective normal operation data. This extraction process ensures that the quantity of stored data is maximized for analysis purposes while minimizing the loss of useful information by focusing storage capacity on critical abnormality-related data.
Solution Approach 2:
The processing unit preliminarily identifies and selects which detection data should be stored in the backup storage before actually storing it. By performing this selection action in advance based on abnormality detection criteria, the system ensures that only useful data is stored, preventing information loss while optimizing storage capacity utilization.
3Loss of information
If the in-vehicle control apparatus does not store detection data at the time of abnormality appearance, then the device complexity is reduced, but the loss of useful information is worsened due to failure to store critical analysis data
Solution Approach 1:
The system uses feedback from the diagnostic unit that detects abnormality conditions to trigger the processing unit to immediately store relevant detection data in the backup storage. This feedback mechanism ensures that critical data is captured at the moment of abnormality appearance without requiring complex continuous monitoring, as the abnormality detection itself serves as the trigger for data storage.
Solution Approach 2:
The processing unit performs preliminary identification of abnormality conditions through the diagnostic unit before executing the data storage action. This preliminary action ensures that only data related to actual abnormalities is stored, preventing unnecessary storage complexity while ensuring critical analysis data is captured at the appropriate time.
Data Source
AI summary
An in-vehicle control system includes an in-vehicle control apparatus and a different in-vehicle apparatus communicably connected with each other. The different in-vehicle apparatus outputs detection data including a vehicle signal, result information indicating a diagnostic result of a self-diagnostic process, and time information indicating elapsed time measured from an appearance of an abnormal symptom in the vehicle signal. The in-vehicle control apparatus stores at least the vehicle signal as preliminary analysis data in a first storage in time series, and reads out, from the first storage, one preliminary analysis data upon a confirmation of an abnormality detection data including the result information indicating abnormality occurrence. The readout data is stored prior to a confirmation time of the abnormality detection data by the measured elapsed time. Then, the in-vehicle control apparatus stores the readout data in a second storage as an analysis data.