Detail of GB/T 27930.2-2024

Introduction of GB/T 27930.2-2024

GB/T 27930.2-2024 Digital communication protocols between off-board conductive charger and electric vehicle - Part 2: Communication protocols for GB/T 20234.3 1 Scope This document specifies the communication protocols based on the physical layer, data link layer, transmission layer, and application layer of the controller area network between the DC charging communication controller for electric vehicles in GB/T 20234.3 DC charging coupler and the charging communication controller of off-board conductive charger. This document is applicable to the digital communication between the electric vehicle (referred to as "vehicle") whose DC control guidance circuit and control principle conforms to GB/T18487.5 and the off-board conductive charger (referred to as "charger"). 2 Normative references The following documents contain requirements 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 of the referenced document (including any amendments) applies. GB/T 1988 Information technology - 7-bit coded character set for information interchange GB 16735 Road vehicles - Vehicle identification number (VIN) GB 18030 Information technology - Chinese coded character set GB/T 18487.5 Electric vehicle conductive charging system - Part 5: DC charging system for GB/T 20234.3 GB/T 19596 Terminology of electric vehicles GB/T 20234.3 Connection set for conductive charging of electric vehicles - Part 3: DC charging coupler GB/T 27930-2023 Digital communication protocols between off-board conductive charger and electric vehicle GB/T29317 Terminology of electric vehicle charging/battery swap infrastructure 3 Terms and definitions For the purpose of this document, the terms and definitions given in GB/T 19596, GB/T 27930-2023, and GB/T 29317 and the following apply. 3.1 function module several definable minimum units with specific business functions divided by the charging communication interaction process 3.2 public message messages that can interact with various function modules at the application layer when the sending conditions are met 4 Abbreviations For the purposes of this document, the following abbreviations apply. CAN: Controller Area Network CP: Control Pilot EVCC: Electric Vehicle Communication Controller LM_ACK: Long Message Acknowledgment LM_EndofACK: Long Message End of Acknowledgment LM_NACK: LongMessage Negative Acknowledgment SECC: Supply Equipment Communication Controller LM: Long Message SM: Short Message SM_ACK: Short Message Acknowledgment SM_RM: Reliable Short Message SM_URM: Unreliable Short Message TL: Transport Layer

Contents of GB/T 27930.2-2024

Contents Foreword i Introduction ii 1 Scope 2 Normative references 3 Terms and definitions 4 Abbreviations 5 General requirements 6 Physical layer 7 Data link layer 8 Transmission layer 9 Application layer 10 Timeout Annex A (Normative) Implementation of application scenario Annex B (Normative) Function negotiation function module Annex C (Normative) Parameter configuration function module Annex D (Normative) Authentication function module Annex E (Normative) Schedule charge function module Annex F (Normative) Output circuit testing function module Annex G (Normative) Power supply mode function module Annex H (Normative) Precharge and energy transfer module Annex I (Normative) End function module Annex J (Normative) Message cycle and function module timeout Annex K (Normative) Exit mode Annex L (Normative) Parameter type table Annex M (Normative) Backward compatible communication protocol Bibliography