(R) Communication Between Plug-In Vehicles and Off-Board DC Chargers
|Publication Date:||1 August 2012|
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 J1772TM 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.
The primary purpose of SAE J2847-2 is to provide the communication to achieve RESS charging control irrespective of RESS variations or energy storage technology.
SAE J2847-1 identifies the functional messaging for the PEV to connect to the utility or service provider and participate in available programs. This document, J2847-2, identifies the additional messages for DC energy transfer to the PEV.
The specification supports DC energy transfer via Forward Power Flow (FPF) from grid to vehicle, and DC Reverse Power Flow (RPF) from vehicle to grid is included in SAE J2847-3.1 DC Forward Power Flow is used to charge the vehicle's rechargeable energy storage system (RESS).