SAE J2847/2_201208

This SAE Recommended Practice SAE J2847-2 establishes requirements and specifications for communication between PLUG-IN ELECTRIC VEHICLE (EVCC)s and the DC Off-board charger. Where relevant, this document notes, but does not formally specify, interactions between the vehicle and vehicle operator. This document applies to the off-board DC charger for conductive charging, which supplies DC current to the RESS of the electric vehicle through a SAE J1772™ coupler. Communications will be on the J1772 Pilot line for PLC communication. The details of PLC communications are found in SAE J2931/4. The specification supports DC energy transfer via Forward Power Flow (FPF) from source to vehicle. SAE J2847-2 provides messages for DC energy transfer. This is based on the use cases in SAE J2836/2™ that established the DC charging requirements. The initial published version, in October, 2011 includes the signals, sequence diagrams and other requirements. Lab and field testing is being conducted on PowerLine Carrier (PLC) products to insure a robust and viable solution for both Utility and DC charging messages. This testing is underway and this document is being updated with these results to provide a more mature production solution. The initial publication was also completed as a 1st step of completion, to release this from the Draft status within the task force and expose it to other standard bodies and public review for additional comments. This revision will include test results, aspects of PLC products as they complete testing and have continued to mature and comments from other organizations. The following information was developed as a combined effort between the SAE J2847-2 committee and the DIN SPEC 70121 team.