GB/T 27930.2-2024 English PDF (GBT27930.2-2024)

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GB/T 27930.2-2024: [This is a DRAFT. GB/T 27930.2-202X, PLAN20241704-T-339-2024] Digital communication protocols between off-board conductive charger and electric vehicle - Part 2: Communication protocols for GB/T 20234.3
GB/T 27930.2-202X (GB/T 27930.2-2024 DRAFT, PLAN20241704-T-339-2024)
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.120
CCS T 35
GB/T 27930.2-202X
Digital communication protocols between off-board
conductive charger and electric vehicle - Par 2:
Communication protocols for GB/T 20234.3
(DRAFT for opinions. PLAN20241704-T-339-2024)
When submitting feedback, please attach the relevant patents you know of together
with supporting documents.
ISSUED ON: XXXX-XX-XX
IMPLEMENTED ON: XXXX-XX-XX
Issued by: Status Administration for Market Regulation;
National Standardization Administration.
Table of Contents
Foreword ... 4
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Abbreviations ... 8
5 General ... 9
6 Physical layer ... 11
7 Data link layer ... 12
7.1 General requirements ... 12
7.2 Version negotiation ... 13
8 Transport layer ... 23
8.1 Overview ... 23
8.2 Unreliable short message ... 24
8.3 Reliable short message ... 24
8.4 Long message ... 25
8.5 Multi-information frame transmission mode... 26
9 Application layer ... 39
9.1 General requirements ... 39
9.2 Communication process ... 40
9.3 Public messages ... 43
10 Timeout ... 53
10.1 Overview ... 53
10.2 Data link layer and transport layer timeout ... 53
10.3 Application layer function module timeout ... 54
Appendix A (Normative) Implementation of application scenarios ... 55
A.1 Charging application scenarios ... 55
A.2 Charging and discharging application scenario ... 56
Appendix B (Normative) Function negotiation function module ... 59
B.1 General requirements ... 59
B.2 Message definition ... 60
B.3 Message interaction process ... 63
Appendix C (Normative) Parameter configuration function module ... 67
C.1 Overview ... 67
C.2 Charging mode parameter configuration (FDC=1) ... 67
C.3 Charging and discharging mode parameter configuration (FDC=2) ... 73
Appendix D (Normative) Authentication function module ... 82
D.1 Overview ... 82
D.2 Scan code/swipe card (FDC=1) ... 82
D.4 Cloud authentication-pile identification code (FDC=3) ... 96
Appendix E (Normative) Scheduled charging function module ... 106
E.1 Overview ... 106
E.2 Vehicle-defined scheduled start time (FDC=1) ... 106
Appendix F (Normative) Output circuit detection function module ... 119
F.1 Overview ... 119
F.2 Output circuit detection (FDC=1) ... 119
Appendix G (Normative) Power supply mode function module ... 127
G.1 Overview ... 127
G.2 Constant voltage power supply mode (FDC=1) ... 127
Appendix H (Normative) Pre-charging and energy transfer module ... 136
H.1 Overview ... 136
H.2 Pre-charging and energy transfer in charging mode (FDC=1) ... 136
H.3 Pre-charging and energy transfer in charging and discharging mode (FDC=2) ... 148
Appendix I (Normative) End function module ... 169
I.1 Overview ... 169
I.2 End (FDC=1) ... 169
Appendix J (Normative) Message cycle and function module timeout ... 176
Appendix K (Normative) Exit method ... 184
Appendix L (Normative) Parameter type table ... 187
Appendix M (Normative) Backward compatible communication protocol ... 196
M.1 General ... 196
M.2 Physical layer ... 196
M.3 Data link layer ... 196
M.4 Application layer ... 198
M.5 Overall charging process ... 199
M.6 Message classification ... 199
M.7 Message format and content ... 201
M.8 Charging process ... 216
M.9 Message sending start and end conditions ... 223
References ... 225
Digital communication protocols between off-board
conductive charger and electric vehicle - Par 2:
Communication protocols for GB/T 20234.3
1 Scope
This document specifies the communication protocol based on the physical layer, data
link layer, transport layer, application layer of the controller area network, between the
electric vehicle DC charging communication controller for the GB/T 20234.3 DC
charging interface and the non-vehicle conductive charger charging communication
controller.
This document applies to DC charging communication between electric vehicles
(referred to as vehicles) whose DC charging interfaces comply with GB/T 20234.3 and
non-vehicle conductive chargers (referred to as chargers).
This document applies to DC charging systems whose charging functions such as DC
control pilot circuits and control principles comply with GB/T 18487.5.
2 Normative references
The contents of the following documents constitute essential clauses of this document
through normative references in the text. Among them, for dated references, only the
version corresponding to that date applies to this document; for undated references, the
latest version (including all amendments) applies to this document.
GB/T 1988-1998 Information technology - 7-bit Coded character set for information
interchange
GB 16735 Road vehicle - Vehicle identification number (VIN)
GB 18030-2022 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
Each information frame shall be identifiable and reassembled. The first byte of the
information frame data field is defined as the frame number of the information frame.
The sequence number range is 1 ~ 255 (the information frame with sequence number 0
is only used to establish a connection). The information frame shall be sent in sequence
starting from number 1. The longest data length is 1785 bytes. When the sender requests
to establish a virtual connection for long message transmission, it first sends the
information frame with frame sequence number 0. After receiving the receiver's
acknowledgement, it sends the information frame as required.
Each information frame (except the last information frame and the information frame
with sequence number 0 used to establish a connection) is loaded with 7 bytes of
application layer data. The 8 bytes of the data field of the last information frame contain:
the sequence number of the information frame and at least one byte of application layer
data. All unused bytes are set to 0xFF.
8.5.2.3 Frame sequence number
The transport layer assigns frame sequence numbers to information frames during
disassembly and assembly. After receiving, the receiver uses the frame sequence
number to reassemble the information frame back to the original information.
Information frames are sent in ascending order starting from information frame
numbered 1. Information frames with sequence number 0 do not contain application
layer data; they are only used to establish virtual connections.
8.5.2.4 Data transmission
The transmission interval LMS_T1 between information frames shall be no less than 5
ms and no more than 10 ms. Only one virtual connection is allowed to be established at
the same time, that is, a new virtual connection can only be established when the sender
or receiver sends a long message negative acknowledgement or the receiver sends a
long message end of acknowledgement.
Note 1: During the communication process, a temporary connection is established between two
nodes to transmit long messages, i.e. a virtual connection.
Note 2: When more than one virtual connection is established at the same time, it is impossible
to distinguish informa...