Electronic Control Unit Readiness Clearing Logic
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Solution Overview
Problem
Existing electronic control units (ECUs) face challenges in appropriately handling 'all clear' requests for clearing readiness information, as existing methods lack secure confirmation of user intention and can lead to incorrect or premature erasure of critical diagnosis data.
Innovation Solution
The ECU incorporates a system where 'all clear' requests for clearing readiness are only fulfilled after meeting specific conditions, such as multiple requests, a read-out request for permanent diagnosis information, or a specified time period, ensuring user intention is confirmed before erasing readiness flags.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the ECU clears readiness information upon receiving an all clear request, then the readiness information can be updated and the system remains simple, but the readiness information may be accidentally or prematurely erased without secure confirmation of user intention
Solution Approach 1:
The ECU performs preliminary actions before clearing readiness information: it determines whether a read-out request for permanent diagnosis information has been received, and counts the number of all clear requests. Only when predetermined conditions are met does the ECU proceed to clear the readiness information, preventing accidental erasure while maintaining operational ease when conditions are satisfied.
2Reliability
If the ECU requires multiple conditions to be met before clearing readiness, then user intention is securely confirmed, but the system complexity increases
Solution Approach 1:
The clearing condition is segmented into distinct, manageable components: (1) receiving an all clear request, (2) checking whether a read-out request for permanent diagnosis information has been received, and (3) counting the number of all clear requests. This segmentation allows the ECU to implement reliable multi-condition checking without excessive complexity, as each condition can be independently evaluated and combined.
Data Source
AI summary
An electronic control unit has (i) a readiness storage area storing readiness indicating that an abnormality diagnosis for diagnosing an abnormality diagnosis item is complete, and (ii) a microcomputer clearing all readiness upon receiving an all clear request based on a condition that is different from a reception of the all clear request. In such configuration, the all clear request for clearing all readiness in the readiness storage area is appropriately handled by the electronic control unit.