GB/T 38775.2-2020 PDF in English
GB/T 38775.2-2020 (GB/T38775.2-2020, GBT 38775.2-2020, GBT38775.2-2020)
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Electric vehicle wireless power transfer -- Part 2: Communication protocols between on-board charger and wireless power transfer device
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Standards related to (historical): GB/T 38775.2-2020
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GB/T 38775.2-2020: PDF in English (GBT 38775.2-2020) GB/T 38775.2-2020
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.99
K 81
Electric Vehicle Wireless Power Transfer - Part 2:
Communication Protocols between On-board Charger
and Wireless Power Transfer Device
ISSUED ON: APRIL 28, 2020
IMPLEMENTED ON: NOVEMBER 1, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3
Introduction ... 4
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 5
4 Abbreviations ... 7
5 Wireless Charging System ... 8
6 Wireless Charging Management Communication Process ... 12
7 Definition of Interface Message ... 41
8 Parameter Definition ... 56
Bibliography ... 74
Introduction
The issuing institution of this document shall pay attention to the fact that the
declaration of compliance with this document might involve the use of patents related
to 5.1, 5.2, 5.4, 6 and 7.5.8 and their corresponding content.
The issuing institution of this document has no standpoint on the authenticity, validity
and the scope of the patents.
The patent holders have assured the issuing institution of this document that they are
willing to negotiate with any applicant on patent licensing under reasonable and non-
discriminatory terms and conditions. The patent holders’ statements have been filed
with the issuing institution of this document. Relevant information may be obtained
through the following contact information:
Patent holder’s name: Witricity Company
Address: 57 Water Street, Watertown, MA, USA
Patent holder’s name: ZX NECORPORATION
Address: 1st Floor, Xili Industrial Park, ZTE Corporation, Nanshan District, Shenzhen,
Guangdong
Patent holder’s name: Zongcharge Wireless Power Technology Co., Ltd.
Address: No. 11 Mingdaxi Road, Laishan District, Yantai, Shandong
Patent holder’s name: Xiamen NEWYEA Science and Technology Co., Ltd. / Xiamen
NEWYEA Electrical Co., Ltd.
Address: 11th Floor, Hesheng Mansion, No. 8 Jinshan Road, Siming District, Xiamen
Patent holder’s name: HUAWEI Technologies Co., Ltd.
Address: HUAWEI Base, Bantian, Longgang District, Shenzhen
Please be noted that in addition to the above patents, certain content of this document
might still involve patents. The issuing institution of this document does not undertake
the responsibility of identifying these patents.
3.1 Charging Spot Identification
Charging spot identification refers to the unique information used to identify charging
spot.
3.2 Charging Spot Information
Charging spot information refers to charging spot identification and coil information of
charging spot in the ground system.
3.3 Coil Information
Coil information refers to information constituted of coil role, identification, type, power
and frequency information to represent the identity and parameters of coil.
3.4 Ground Facilities Information
Ground facilities information refers to information constituted of the software and
hardware version information of charging spot information, communication service unit
(CSU), power transmit controller (PTC) and power factor correction (PFC), the binding
relationship between communication service unit (CSU) and power transmit controller
(PTC), and the binding relationship between power transmit controller (PTC) and
charging spot to represent the identity and functions of the ground system.
3.5 Charging State
Charging state refers to the state of the electric vehicle after it is connected to the
power transfer system. It includes two states: charged and uncharged.
3.6 Vehicle System Information
Vehicle system information refers to information constituted of software and hardware
version information of in-vehicle unit (IVU) and power pickup controller (PPC) in the
vehicle system to represent the identity and functions of the vehicle system.
3.7 Vehicle State
Vehicle state is used to represent the state of on-board supply devices and vehicle
driving state during the wireless charging process. It mainly includes in-vehicle unit
(IVU) state and vehicle driving mode. When a failure occurs, it also includes the
corresponding failure value and power pickup controller (PPC) charging power.
3.8 Keep Alive
Keep alive is a mechanism that confirms whether two communication nodes are
connected. In the communication protocols, device with communication connection is
allowed to periodically send empty segments without data to the peer of the connection.
If the connection is still valid, the peer device will respond with a segment containing
5 Wireless Charging System
5.1 Overview
In structure, the wireless charging system is divided into off-board devices and on-
board devices, between which, there is no direct physical connection. During the
wireless charging process, the off-board devices and on-board devices shall exchange
information through wireless communication, so as to implement the control and
management of the charging process.
During the operation of the wireless charging system, CSU shall effectively
communicate with the electric vehicle control system through IVU, so as to implement
security monitoring of the charging process.
In case B communication, the wireless charging system shall have the capability of
remote comprehensive management on the network side. CSU shall be equipped with
an interface for data communication with WCCMS.
The wireless charging system includes two parts: ground system and vehicle system:
a) Ground system: it includes WCCMS, CSU, PTC, PFC and PrC, etc.;
b) Vehicle system: it includes vehicle control system, IVU, PPC and PuC, etc.
The management and communication system include communication units of WCCMS,
CSU and IVU, etc. PTC, PrC, PPC and PuC constitute the wireless power transfer
system, and implement the transmission of electrical energy from the ground system
to the vehicle system through the wireless interface. PTC of the ground system and
PPC of the vehicle system implement interaction and communication through the
management and communication system. Figure 1 is an architecture diagram of
wireless charging system.
Between PPC and the vehicle control system, there may be a communication interface.
NOTE: this Standard currently does not support scenarios where management and
communication system across multiple operators.
CSU and IVU;
2) Wireless charging monitoring;
3) Measurement processing (optional);
4) Participate in part of charging control, such as: checking whether IVU
user identification and IVU device identification are matching, whether
CSU user identification and CSU device identification are matching, and
charging abnormality handling, etc.
b) CSU: communication service unit, which completes the signaling control of
the ground system, and the communication channel function of the WCCMS
to the ground system, and the vehicle system to the ground system. CSU shall
be equipped with the following functions:
1) Control PTC initiation and stop power supply to PrC;
2) PTC and PFC failure and abnormality detection;
3) Report charging state to IVU;
4) Forward PPC and PTC data with IVU;
5) Check whether primary coil and pickup coil are matching.
In case B communication, CSU shall also be equipped with the following
functions:
1) Take charge of communication between the ground system and the
WCCMS;
2) Report charging state to WCCMS.
c) IVU: in-vehicle unit, which implements control of the in-vehicle part of wireless
charging, completes the signaling interaction with PPC and signaling
interaction with CSU. IVU shall be equipped with the following functions:
1) Take charge of communication with CSU in the ground system and the
vehicle control system;
2) Monitor fault and abnormality of PPCS and the vehicle control system;
3) Forward PPC and PTC data with CSU;
In case B communication, IVU shall provide necessary information for
WCCMS.
IVU may provide users with man-machine interface for wireless charging
control and state monitoring.
5.3 Physical Layer Protocol
The communication physical layer of CI interface shall comply with the stipulations of
IEEE Std 802.11TM.
NOTE 1: IEEE Std 802.11TM is implemented through HT Aps or HT STAs.
NOTE 2: HT STA functions are specified in detail in 4.3.10 of IEEE Std 802.11TM:2012. HT
AP is an access node with the same functions as HT STA.
5.4 Communication Interface
The wireless charging system has the following interfaces:
a) WI interface (optional): interface between WCCMS and IVU. This interface
may also represent IVU’s indirect connection to WCCMS through CSU. The
main functions include IVU registration, information reporting and the initiation
of a request to start charging and keep alive. In charging mode B, WI interface
may be established.
b) WC interface: interface between WCCMS and CSU. The main functions
include CSU registration, information reporting and keep alive, as well as
WCCMS’s initiation of charging command to CSU through this interface. In
charging mode B, WC interface shall be established.
c) CI interface: interface between CSU and IVU, including two logic interfaces:
control signaling interface and data interface. The control signaling interface
mainly provides the charging control function between CSU and IVU. The data
interface provides IP address of IVU looking for CSU, and the bearing and
keep alive of data communication between PTC and PPC.
d) Other interfaces: in the vehicle system, interfaces between IVU and PPC are
internal interfaces. In the ground system, interfaces between CSU and PTC
are internal interfaces.
5.5 Relationships among CSU, PTC and PrC
Figure 2 is a diagram of the relationships among CSU, PTC and PrC. One CSU may
control multiple PTCs, while one PTC can only be controlled by one CSU.
PTC may supply power to a specified PrC through a controllable switching element;
PTC may also simultaneously supply power to multiple PrCs by setting a controllable
switching element. The control of the controllable switching element shall be performed
by CSU.
CSU registration process is as follows:
a) CSU initiates registration request to WCCMS, with information that includes
CSU user identification, device identification, and probably, digital signature.
b) If digital signature is received, WCCMS checks the digital signature sent by
CSU and IVU and verifies the integrity of the device. If it succeeds, then, send
authentication request message to CSU, with a random number of network
calculation authentication code of the current authentication in the message.
If it fails, then, return registration response, with a failure reason value.
c) In accordance with the random number and user key, CSU locally calculates
network calculation authentication code. If it is consistent with the network
calculation authentication code provided by WCCMS, then, CSU successfully
authenticates WCCMS. In accordance with the random number and user key,
CSU calculates the calculation authentication code of the device, and returns
the device calculation authentication code to WCCMS in the authentication
response.
d) WCCMS determines that the device calculation authentication code is correct,
then, WCCMS believes the authentication of CSU is successful, then, returns
registration response to CSU.
After CSU registration is successful, CSU takes the initiative to report the ground
system information, including the correspondence of the CSU and PTC with the
charging spot. If WCCMS determines that there is a charging vehicle in the charging
spot controlled by the CSU, then, it informs the latest charging spot information, and
triggers corresponding IVU to re-acquire CSU address.
6.5.2 CSU and IVU log off process (optional)
CSU and IVU log off process is shown in Figure 25. This process is used when CSU
and IVU log off from WCCMS.
The process that IVU logs off from CSU shall comply with 6.3.2.
8.7 IVU User Identification
It uniquely identifies IVU user. The type of encoding: OctetString.
8.8 IVU Device Identification
It uniquely identifies IVU device. The type of encoding: OctetString.
8.9 PTC Identification
It indicates PTC logical number, which uniquely identifies PTC in CSU. The type of
encoding: OctetString.
8.10 PPC Identification
It is a unique identification indicating PPC in the vehicle system. The type of encoding:
OctetString.
8.11 PPC Address
It indicates PPC’s physical address, which is used in PTC’s communication with PPC.
The type of encoding: OctetString.
8.12 PFC Power Supply Type
It indicates the type of power supply from the power grid to PFC. The type of encoding
is: Enumerated. See the definition in Table 30.
Table 30 -- PFC Power Supply Type
Value Remarks
001 Single-phase
002 Three-phase
8.13 IP Address of CSU Data Interface
It indicates IP address of CSU used for CI data interface. The type of encoding:
OctetString.
8.14 UDP Port No. of CSU Data Interface
It indicates port No. of CSU used for CI data interface. The type of encoding:
Unsigned32.
8.15 IP Address of CSU Control Signaling Interface
It indicates IP address of CSU used for CI control signaling interface. The type of
encoding: OctetString.
8.16 Port No. of CSU Control Signaling Interface
It indicates PFC performance measurement information of the current charging,
including Phase-A input voltage, Phase-B input voltage, Phase-C input voltage, input
frequency, input power, Phase-A input current, Phase-B input current, Phase-C input
current, Phase- A active power, Phase-B active power, Phase-C active power, bus
positive voltage and bus negative voltage. The type of encoding is OctString.
In the character string, the various contents shall adopt the format of “name = value”;
the various contents shall use semi-colon for separation.
8.39 PPC Performance Measurement Information
It indicates PPC performance measurement information, PPC’s output voltage to
battery, PPC’s output current to battery, PPC radiator inner temperature, PPC output
voltage, midpoint voltage, charging power and charging time of the current charging.
The type of encoding is OctString.
In the character string, the various contents shall adopt the format of “name = value”;
the various contents shall use semi-colon for separation.
8.40 Vehicle Control System Performance Measurement Information
It indicates the battery pack performance measurement information of the current
charging, including the current voltage (confirm the relationship with output voltage and
current of the former PPC) and current, battery pack maximum voltage, battery pack
minimum voltage, battery pack highest temperature, battery pack lowest temperature,
SOC information and warning information of the current charging. The type of encoding
is: OctString.
In the character string, the various contents shall adopt the format of “name = value”;
the various contents shall use semi-colon for separation.
8.41 Vehicle State Information
It indicates vehicle’s charging state. The type of encoding is: Grouped. See the specific
content in Table 49.
Table 49 -- Vehicle State Information
Parameter Attribute Remarks
Charging Spot
Identification O
Indicates the charging spot where the electric vehicle
currently parks. If there is no charging spot identification,
then, it indicates that the electric vehicle leaves the
charging spot, see 8.3.
IVU User Identification M Uniquely identifies IVU user, see 8.7.
IVU State Information M Indicates IVU state in the vehicle system, see 8.42.
PPC State Information
List M
Indicates the charging state of one or multiple PPCs in
the vehicle system, see 8.44.
Vehicle Driving Mode M See 8.43.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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