EV Root Certificate Switching for Plug and Charge Compatibility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The lack of a defined syntactic pattern for the root certificate corresponding to battery electric vehicles (BEVs) leads to mismatches between BEVs and charging stations, preventing the installation of contract certificates and thus hindering Plug and Charge (PnC) system functionality.
Innovation Solution
A control device and method that transmit information about a root certificate to a charging station to request a contract certificate, and upon receiving a mismatch notification, the device changes the root certificate and re-transmits it to the charging station, ensuring compatibility and enabling power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the root certificate is transmitted from the battery electric vehicle to the charging station to store the contract certificate, then the PnC charge can be achieved, but the root certificate may not match between the battery electric vehicle and the charging station due to undefined syntactic pattern
Solution Approach 1:
The patent applies parameter changes by modifying the root certificate information (specifically the common name field) when a mismatch is detected. The control device changes the syntactic parameters of the root certificate to match the charging station's expected format, enabling successful contract certificate installation despite initial incompatibility.
Solution Approach 2:
The patent implements feedback by having the charging station transmit mismatch notifications when the root certificate does not match. The control device receives this feedback, processes it by changing the root certificate, and retransmits it, creating a closed-loop system that resolves compatibility issues automatically.
2Reliability
If the root certificate is changed when mismatch notification is received, then the contract certificate can be requested again using the changed root certificate, but additional communication and processing steps are required
Solution Approach 1:
The patent applies preliminary action by proactively changing the root certificate upon receiving a mismatch notification, rather than failing the entire charging process. This preliminary correction enables subsequent successful communication and contract certificate installation, preventing complete system failure.
Solution Approach 2:
The patent implements dynamics by making the root certificate information adaptable and changeable rather than static. The control device dynamically modifies the root certificate based on feedback from the charging station, allowing the system to adjust to different charging station requirements and maintain operational flexibility.
Data Source
AI summary
A battery information server (control device) includes a communication unit that transmits information of a root certificate to an EVSE when requesting a contract certificate from an EVSE (power stand), and a processor. The processor changes the root certificate if the communication unit receives an inconsistency notification indicating that the root certificate does not match EVSE. The communication unit transmits the changed root certificate to EVSE.