Energy Transfer System for Electric Vehicles - Part 2: Communication Requirements and Network Architecture(STABILIZED Feb 2014)
SAE J2293 establishes requirements for Electric Vehicles (EV) and the off-board Electric Vehicle Supply Equipment (EVSE) used to transfer electrical energy to an EV from an Electric Utility Power System (Utility) in North America. This document defines, either directly or by reference, all characteristics of the total EV Energy Transfer System (EV-ETS) necessary to insure the functional interoperability of an EV and EVSE of the same physical system architecture. The ETS, regardless of architecture, is responsible for the conversion of AC electrical energy into DC electrical energy that can be used to charge the Storage Battery of an EV, as shown in Figure 1.
The different physical ETS system architectures are identified by the form of the energy that is transferred between the EV and the EVSE, as shown in Figure 2. It is possible for an EV and EVSE to support more than one architecture.
This document does not contain all requirements related to EV energy transfer, as there are many aspects of an EV and EVSE that do not affect their interoperability. Specifically, this document does not deal with the characteristics of the interface between the EVSE and the Utility, except to acknowledge the Utility as the source of energy to be transferred to the EV.
The functional requirements for the ETS are described using a functional decomposition method. This is where requirements are successively broken down into simpler requirements and the relationships between requirements are captured in a graphic form. The requirements are written as the transformation of inputs into outputs, resulting in a model of the total system.
Each lowest level requirement is then allocated to one of four functional groups (FG) shown in Figure 2. These groups illustrate the variations of the three different system architectures, as the functions they represent will be accomplished either on an EV or within the EVSE, depending on the architecture. Physical requirements for the channels used to transfer the power and communicate information between the EV and the EVSE are then defined as a function of architecture. System architecture variations are referred to as follows:
Type A—Conductive AC System Architecture—J2293-1—6.2.1
Type B—Inductive System Architecture —J2293-1—6.2.2
Type C—Conductive DC System Architecture—J2293—6.2.3
The requirements model in Section 6 is not intended to dictate a specific design or physical implementation, but rather to provide a functional description of the system’s expected operational results. These results can be compared against the operation of any specific design. Validation against this document is only appropriate at the physical boundary between the EVSE and EV. See Section 8.
This stabilized Recommended Practice documents for reference the historical state of energy transfer systems and communications for electric vehicles as they existed in 2008, as defined in SAE J1772 (per published version 11-1-2001) for conductive charging and SAE J1773 (per published version 11-1-1999) for inductive charging.
SAE J1772 continues to be updated to reflect the latest in conductive charging technology. See the latest available version of J1772.
SAE J1773 remains unchanged for inductive charging.
Documentation for the now-emerging “wireless” inductive charging systems will be published when available.
Grid power quality for supplying charging systems is covered in SAE document series J2894.
For state-of-the-art documentation on charging communications, refer to the SAE documents in the series J2836, J2847, J2931, and J2953.
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