Detail of GB/T 27930-2023

Introduction of GB/T 27930-2023

GB/T 27930-2023 Digital communication protocols between off-board conductive charger and electric vehicle 1 Scope This document specifies the definitions of and requirements for the physical layer, data link layer, transport layer and application layer of communication based on the controller area network (CAN) between the supply equipment communication controller (SECC) and the electric vehicle communication controller (EVCC) of off-board conductive charger (hereinafter referred to as the "charger"). This document is applicable to the communication between the charger or bi-directional charger in charge mode 4 and the electric vehicle; it is also applicable to the communication between the charger or bi-directional charger and the electronic control unit of the electric vehicle with charging control function. The EVCC includes, but is not limited to, a battery management system (BMS), and an in-vehicle system that is required to communicate with the charger for other special functions. In this document, Clauses 5–11 are applicable to the charging systems specified in Annex B to GB/T 18487.1-2023 (hereinafter referred to as "Category A systems"), and Clauses 101–106 are applicable to the charging systems specified in Annex C to GB/T 18487.1-2023 as well as the charging and discharging systems defined in Annex E (hereinafter referred to as "Category B systems"). For the purpose of this document, the term "vehicle" refers specifically to "electric vehicle". 2 Normative references The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies. GB/T 18487.1-2023 Electric vehicle conductive charging system - Part 1: General requirements GB/T 19596 Terminology of electric vehicles GB/T 29317 Terminology of electric vehicle charging/battery swap infrastructure GB/T 32960.3-2016 Technical specifications of remote service and management system for electric vehicles - Part 3: Communication protocol and data format NB/T 10905-2021 Fault classification and code of charging facilities for electric vehicles SAE J1939-11:2006 Recommended practice for serial control and communication vehicle network - Part 11: Physical layer-250kbits/s, twisted shielded pair SAE J1939-11:2016 Recommended practice for serial control and communication vehicle network - Part 11: Physical layer-250kbits/s, twisted shielded pair SAE J1939-15:2018 Recommended practice for serial control and communication vehicle network – Part 15: Physical layer-250kbits/s, un-shielded twisted pair SAE J1939-21:2006 Recommended practice for serial control and communication vehicle network - Part 21: Data link layer SAE J1939-21:2021 Recommended practice for serial control and communication vehicle network - Part 21: Data link layer 3 Terms and definitions For the purposes of this document, the terms and definitions given in GB/T 19596, GB/T 29317 and GB/T 18487.1 and the following apply. 3.1 data link layer 3.1.1 frame set of data bits constituting a complete message 3.1.2 CAN data frame ordered bit fields necessary for the CAN protocol for data transport, starting with the start of frame (SOF) and ending with the end of frame (EOF) 3.1.3 CAN message instance of sending or receiving a parameter group and its parameter data Note: Sending a message may require interacting with one or more "CAN data frames". 3.1.4 identifier identity part of the CAN arbitration field   3.1.5 extended frame CAN data frame that adopts a 29-bit identifier, as defined in the CAN 2.0 B specifications 3.1.6 priority 3-bit field in the identifier that sets the arbitration priority during transport, with Grade 0 as highest priority and Grade 7 as lowest priority 3.1.7 parameter group; PG set of parameters transported at the application layer 3.1.8 parameter group number; PGN 24-bit value that uniquely identifies a parameter group Note: A PGN is represented by an extended data page, a data page, the PDU format field, and the PDU specific field. 3.1.9 suspect parameter number; SPN 19-bit value used to identify a specific element, component, or parameter associated with the ECU 3.1.10 protocol data unit; PDU specific format of the CAN data frame 3.1.11 information frame; IF CAN data frame used to transmit valid information or data at the data link layer 3.1.12 control frame; CF CAN data frame at the data link layer for flow control, error management, and acknowledgment of receipt 3.1.13 transport protocol part of the data link layer, a mechanism for transmitting PGNs with data lengths ranging from 9 bytes to 1785 bytes   3.2 transport layer 3.2.1 multi-information frame transport mode mode for transporting multiframe data with frame numbers using the automatic repeat request 3.2.2 long message; LM message with data length greater than 8 bytes, transported by multi-information frame transport mode 3.2.3 short message message with data length ≤ 8 bytes 3.2.4 reliable message; RM message transported using the automatic repeat request Note: Both reliable short and long messages are included. 3.2.5 unreliable message; URM single frame data without frame number not transmitted using the automatic repeat request 3.3 application layer 3.3.1 parameter group identification; PGI byte used to uniquely identify a parameter group 3.3.2 function module business function in the process of energy interaction between the electric vehicle and the charger 3.3.3 mandatory function module function module necessary for a complete energy interaction process   3.3.4 configurable function module optional function module in a complete energy interaction process 3.3.5 override function module function module that can be redefined and replaced 3.3.6 function code; FC number assigned to the function module 3.3.7 function description code; FDC number assigned to the function module instance with a specific function 3.3.8 optional item parameter item can be sent optionally during information interaction 3.3.9 mandatory item parameter item that must be sent during information interaction 3.4 others 3.4.1 electronic control unit; ECU control device composed of a microcontroller and a peripheral circuit Note: An ECU is an on-board computer. 3.4.2 electric vehicle communication controller; EVCC embedded system inside the electric vehicle for communicating with charging equipment 3.4.3 supply equipment communication controller; SECC entity for communicating with one or more EVCCs 3.4.4 vehicle adaptor communication controller; VACC embedded system in a vehicle adapter for communicating with the EVCC and SECC 3.4.5 extended vehicle identification number; EVIN vehicle identification number (VIN) or a vehicle identification code designed with the letters I, O, or Q to identify the identification information of a vehicle

Contents of GB/T 27930-2023

Foreword I 1 Scope 2 Normative references 3 Terms and definitions 4 Abbreviations 5 General requirements for Category A systems 6 Physical layer of Category A systems 7 Data link layer of Category A systems 8 Application layer of Category A systems 9 General flow of charging for Category A systems 10 Message classification of Category A systems 11 Message format and content of Category A systems 12 General principles for Category B systems 13 Physical layer of Category B systems 14 Data link layer of Category B systems 15 Transport layer of Category B systems 16 Application layer of Category B systems 17 Timeout of Category B systems Annex A (Normative) Communication flow of Category A systems Annex B (Informative) Conditions for starting and ending sending messages of Category A systems Annex C (Normative) Function negotiation function module Annex D (Normative) Parameter configuration function module Annex E (Normative) Authentication function module Annex F (Normative) Schedule function module Annex G (Normative) System self-check function module Annex H (Normative) Power supply function module Annex I (Normative) Precharge and energy transfer function module Annex J (Normative) Service statistics function module Annex K (Informative) Implementation of basic charging application scenario Annex L (Informative) Implementation of bi-directional charging application scenario Annex M (Normative) Parameter type table Annex N (Informative) Implementation of adaptor communication