EV Charging Communication Sequence for Expired Certificate Handling
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Solution Overview
Problem
Existing communication sequences for vehicle charging are inefficient when certificate data expire at the start, leading to incomplete information transfer and failure to initiate external charging due to timeout issues during the update process.
Innovation Solution
A vehicle system that suspends the communication sequence when a predicted timeout is imminent for certificate data update, allowing the update process to be completed before resuming the sequence, thereby eliminating the expiration issue and ensuring efficient information transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the communication sequence is executed normally when certificate data has expired, then the update process is initiated, but the update process times out due to communication speed reduction, causing the communication sequence to end halfway and external charging to fail
Solution Approach 1:
The control device checks whether certificate data has expired before starting the communication sequence. When expiration is detected, the device performs the update process in advance by accessing the server to obtain renewed certificate data, thereby preventing timeout during the communication sequence execution.
Solution Approach 2:
The control device proactively identifies the expiration condition and counteracts the potential timeout issue by completing the certificate update before the communication sequence begins, thus eliminating the harmful effect of timeout on communication completion.
2Productivity
If the communication sequence is restarted after a timeout occurs, then external charging may be initiated, but information already exchanged in the previous sequence is exchanged again, reducing information transfer efficiency
Solution Approach 1:
By checking certificate expiration status before initiating the communication sequence and completing updates in advance, the system prevents timeout occurrences. This ensures the communication sequence executes successfully in one attempt, avoiding the need to restart and re-exchange information, thereby maintaining high information transfer efficiency.
3Reliability
If the update process is executed during the communication sequence, then certificate data can be renewed, but the process takes too long due to communication speed reduction, causing the sequence to end halfway
Solution Approach 1:
The control device performs the certificate update process before the communication sequence starts by accessing the server. This preliminary execution ensures certificate data is valid while avoiding the time consumption issue during the communication sequence, as the update is completed in advance when communication resources are available.
Data Source
AI summary
The vehicle is configured to be capable of performing external charging for charging the battery by a power facility provided outside the vehicle. The vehicle includes a storage device and a control device. The storage device stores certificate data for permitting execution of external charging. The control device controls a communication sequence executed between the power facility and the vehicle before the start of the external charging. The certificate data has an expiration date. The control device executes an update process for updating the certificate data when the expiration date has expired at the start of the communication sequence, and suspends the communication sequence when the timeout of the update process is predicted.