EV Charging Communication Capture via CAN for Remote Diagnostics
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Solution Overview
Problem
Current methods for accessing and analyzing charging-related communications between electric vehicle supply equipment (EVSE) and electric vehicles require manual intervention and intermediate devices, leading to inefficiencies and incomplete data capture, limiting diagnostic accuracy and scalability.
Innovation Solution
A system that encodes EVSE-to-vehicle communications into Controller Area Network (CAN) messages within the vehicle's existing infrastructure, allowing direct transmission to external services without relying on a communication link between the EVSE and the external service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual connection of intermediate listening devices is used to access charging communications, then data can be captured, but human operator presence is required and the process is inefficient
Solution Approach 1:
The electric vehicle performs data capture and transmission automatically without requiring human operator intervention. The vehicle's communication controller autonomously receives charging communications, encodes them into CAN messages, and transmits them to external services, making the system self-sufficient and eliminating the need for manual device connection and operation
Solution Approach 2:
The patent introduces an intermediate communication controller within the electric vehicle that acts as a mediator between the charging communication interface and the CAN bus system. This intermediary component automatically captures charging communications and converts them into standardized CAN messages for transmission, replacing the need for external listening devices and manual intervention
2Measurement precision
If complete charging session data is transmitted to external services, then diagnostic accuracy is improved, but data transmission time and processing load increase
Solution Approach 1:
The communication controller continuously monitors and captures charging communications throughout the charging session, preparing and buffering the data in advance. By performing preliminary data collection and encoding during the charging process itself, the system has complete diagnostic data ready for immediate transmission once the session ends, reducing overall data transmission time while maintaining full diagnostic capability
Solution Approach 2:
The system maintains continuous data capture and encoding operations throughout the entire charging session rather than attempting to retrieve data afterward. This continuous operation ensures complete data collection without interruption, enabling comprehensive diagnostics while allowing batch transmission of all accumulated data efficiently once the charging session concludes
3Productivity
If EVSE communicates directly with external services, then real-time monitoring is enabled, but system complexity and communication link requirements increase
Solution Approach 1:
The patent merges the data capture, encoding, and transmission functions into a single integrated communication controller within the electric vehicle. By combining these functions and utilizing the vehicle's existing CAN bus infrastructure and communication interfaces, the system eliminates the need for separate direct communication links between EVSE and external services, reducing overall system complexity while maintaining real-time monitoring capability
Solution Approach 2:
The communication controller performs multiple functions: receiving charging communications, encoding them into CAN messages, and transmitting them to external services. By making this single component multi-functional, the system eliminates the need for dedicated communication pathways and intermediate devices, simplifying the overall architecture while enabling real-time data transmission from charging sessions to external services
Data Source
AI summary
The present disclosure provides systems and methods for capturing communications between an electric vehicle and electric vehicle supply equipment (EVSE) and transmitting the captured communications to an external service. The disclosed examples include extracting a payload from messages communicated from EVSE and encoding the payload into Controller Area Network (CAN) messages. The CAN messages may be transmitted out to the external service for further logging and/or processing.