QC/T 842-2010Communication protocols between battery management systems and off-board chargers for electric vehicles (English PDF)
电动汽车电池管理系统与非车载充电机之间的通信协议
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Issued by
MIIT
Level / Type
Industry · Recommended
Issue date
November 22, 2010
Implementation date
March 1, 2011
Scope
QC/T 842-2010 is the English-translated version of 电动汽车电池管理系统与非车载充电机之间的通信协议.
QC/T 842-2010 is the Chinese automotive industry standard for the CAN communication between an electric vehicle's battery management system (BMS) and an off-board charger.
It builds on ISO 11898-1 and SAE J1939, using a 29-bit identifier and a 250 kbps baud rate as reference while allowing other formats, and defines the physical layer interface, the data link layer frame format and address assignment.
The charging process runs through four phases, handshake, configuration, charging and charging termination, during which the BMS sends battery charging requirements in real time and reports charging statistics at the end.
A normative annex fixes the format and content of every application layer message, and an informative annex gives the charging flow charts. It applies to off-board charging of electric vehicles. Issued on 22 November 2010, it has applied since 1 March 2011.
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Document preview — QC/T 842-2010
National Standard of the People's Republic of China
Issued by: Ministry of Industry and Information Technology of the People's Republic of China
Contents
- Foreword5
- 1 Scope6
- 2 Normative References6
- 3 Terms and Definitions7
- 4 Physical Layer Interface8
- 5 Data Link Layer8
- 6 Charging Process10
- Annex A (Normative) Format and Content of Application Layer Messages13
- Annex B (Informative) Charging Flow Charts27
Foreword
The data frame format of this Standard is specified in CAN Bus Technical Specifications 2.0 issued in September, 1991.
Annex A of this Standard is normative; Annex B is informative.
1 Scope
This Standard specifies communication protocols between battery management system (hereinafter referred to as BMS) and off-board charger (hereinafter referred to as charger) for electric vehicles. This Standard applies to off-board charging for electric vehicles.
CAN identifier of this Standard is 29 bits, and communication baud rate is 250 kbps, but this Standard is not limited to 29-bit identifier and 250 kbps communication baud rate. If other formats are used, their CAN identifier shall be made by reference to this Standard.
Data transmission of this Standard is by the format of low bits transmitted first. Negative current value represents charging; positive current value represents discharging.
2 Normative References
The provisions in the following documents become part of this Part through reference in this Standard. For dated documents, the subsequent amendments (excluding corrigenda) or revisions do not apply to this Standard. However, all parties who enter into agreement based on this Standard are encouraged to study whether the latest versions of these documents are applicable. For undated documents, the latest versions apply to this Standard.
ISO 11898-1:2006, Road Vehicles - Controller Area Network (CAN) - Part 1: Data Link Layer and Physical Signalling
SAE J1939-11.2006, Recommended Practice for a Serial Control and Communications Vehicle Network - Part 11: Physical Layer, 250K bits/s, Twisted Shielded Pair
3 Terms and Definitions
For the purpose of this Standard, the following terms and definitions apply.
3.1 Frame
a series of data bits constituting a complete message
3.2 Identifier
identification section of CAN arbitration field
3.3 CAN data frame
necessary bit fields constituting CAN protocols, started from start of frame (SOF) ended at end of frame (EOF)
3.4 Start of frame (SOF)
first data bit representing the start of frame in CAN data frame
3.5 End of frame (EOF)
a 7-bit field representing the end of frame in CAN data frame
4 Physical Layer Interface
4.1 The Physical layer realizes the electric connection in the network between BMS and charger
4.2 A CAN interface independent to the power assembly control system is preferred for the communications between BMS and charger.
5 Data Link Layer
5.1 General
Data link layer provides reliable data transmission between physical connections.
5.2 Frame format
As shown in Figure 1, the CAN extended data frame is divided into different bit fields, where the arbitration field which has a 29-bit identifier, including an11-bit basic identifier and an 18-bit identifier extension. The CAN data frame format of this Standard is referred to SAE J1939-21; and the 29-bit identifier of the arbitration field is further defined.
5.4 Address assignment
In the network adopting this Standard, the address is used to ensure the uniqueness of identifiers and indicate the source of messages. The source address of BMS and charger is defined to be a non-configurable address, ie.
6 Charging Process
6.1 General rules
The whole charging process includes four phases. handshake phase, configuration phase, charging phase and charging termination phase.
6.2 Handshake phase
After the physical connection between BMS and charger is completed and electrified, and that the manual setting of CAN identifier format and communication baud rate is completed, the BMS and charger enter the handshake phase.
6.3 Configuration phase
After the handshake phase, the BMS and charger enter the configuration phase.
During the phase, the charger sends the message of its maximum output capacity to the BMS; then the BMS judges whether charging can be done in accordance with the maximum output capacity of the charger.
6.4 Charging phase
After the configuration phase, the BMS and charger enter the charging phase. During the whole charging phase, the BMS controls the whole charging process by sending in real time the battery charging level requirements to the charger.
6.5 Charging termination phase
After the BMS and charger terminates charging, both sides enter the charging termination phase. During the phase, the BMS sends the charging statistical data of the whole charging process to the charger, including.
Annex A (Normative) Format and Content of Application Layer Messages
A.1 Handshake phase
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 27 pages — is available in the English PDF.
Referenced standards
Normative references
ISO 11898-1:2006 · SAE J1939-11.2006
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