CN114745220A - Automatic addressing control method and system for master-slave distributed battery management system - Google Patents
Automatic addressing control method and system for master-slave distributed battery management system Download PDFInfo
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- CN114745220A CN114745220A CN202210280716.6A CN202210280716A CN114745220A CN 114745220 A CN114745220 A CN 114745220A CN 202210280716 A CN202210280716 A CN 202210280716A CN 114745220 A CN114745220 A CN 114745220A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
- H04L2012/40215—Controller Area Network CAN
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40267—Bus for use in transportation systems
- H04L2012/40273—Bus for use in transportation systems the transportation system being a vehicle
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides an automatic addressing control method and system for a master-slave distributed battery management system, which comprises the following steps: the master board and each slave board carry out interactive handshake through broadcast frames; providing hard-line PWM frequency signals containing address information step by step through the main board and each slave board; and the master board and the corresponding slave board carry out addressing message interaction, and after the CAN message addressing and the hard line address information verification are passed, the address information is written into the corresponding slave board, so that the automatic addressing of each slave board in sequence is realized. By configuring a hard-line PWM frequency (containing address information) input signal, when the input signal is verified and matched with CAN message write address information, an address CAN be written into a corresponding slave plate, so that the addressing accuracy and reliability of the slave plate are greatly improved.
Description
Technical Field
The invention belongs to the technical field of information processing, and particularly relates to an automatic addressing control method and system for a master-slave distributed battery management system.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The new energy vehicle uses a plurality of batteries to provide energy for the vehicle, the corresponding battery management system is a distributed battery management system, as shown in fig. 1, a plurality of battery packs respectively correspond to a slave board control unit (called a slave board for short) to realize information acquisition and monitoring, and then the information acquisition and monitoring is sent to a master board control unit (called a master board for short) through a Controller Area Network (CAN) or a Serial Peripheral Interface (SPI).
However, if a plurality of slave board control units send information to the master board control unit at the same time, the addresses of the slave board control units need to be distinguished, so that the slave board control units can accurately receive information corresponding to which battery pack or which battery cell or faults.
At present, a specific ID is written into each slave board, and the master board sends and receives a message according to the specific ID, thereby realizing normal communication. Once a slave plate is replaced, it is necessary to determine which slave plate is specific, and in addition, the program needs to be updated again, so that on one hand, the slave plates cannot be automatically identified, and on the other hand, consistency of all slave plate programs cannot be achieved.
Therefore, at present, the master board control unit cannot distinguish which slave board control unit sends information, and then cannot determine which battery pack or which battery cell receives information or a fault.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an automatic addressing control method for a master-slave distributed battery management system, which realizes the automatic, reliable and accurate addressing of all slave plates in sequence.
To achieve the above object, one or more embodiments of the present invention provide the following technical solutions:
in a first aspect, an automatic addressing control method for a master-slave distributed battery management system is disclosed, which comprises the following steps:
the master board and each slave board carry out interactive handshake through broadcast frames;
providing hard-line PWM frequency signals containing address information step by step through the main board and each slave board;
and the master board and the corresponding slave board carry out addressing message interaction, and after the CAN message addressing and the hard line address information verification are passed, the address information is written into the corresponding slave board, so that the automatic addressing of each slave board in sequence is realized.
As a further technical scheme, before the master board and each slave board are subjected to broadcast frame interactive handshake, low voltage is applied to the master board and each slave board, controllers of each master board and each slave board are initialized to enter an addressing mode, and the upper computer writes the number of the slave boards.
As a further technical solution, providing hard-line PWM frequency signals containing address information step by step through a master board and each slave board specifically includes:
the mainboard sends out a broadcast message through the CAN, address bits are initialized to a numerical value after all slave boards receive the broadcast message, and normal communication between the mainboard and the slave boards is represented; after the message is sent out after a certain time is delayed, the mainboard outputs a frequency value containing address information through PWM driving, and the PWM signal is delayed for a certain time to be output.
As a further technical scheme, the master board and the corresponding slave board perform addressing message interaction, specifically, the interaction is performed by a question-and-answer mode through the CAN message.
As a further technical solution, the method for performing addressing message interaction between a master board and a corresponding slave board specifically includes:
sending a query message in a master-slave period, judging whether the slave board replies before timeout and whether the master board finishes addressing, and if the slave board replies before timeout or the slave board finishes addressing, failing to address and ending the addressing function;
if addressing is not finished and the slave board communication is not overtime, addressing is not finished, any slave board correspondingly receives the PWM frequency, the slave board judges the address bit and the PWM input frequency, and the requirement is met, the slave board replies the addressing preparation through the CAN.
As a further technical solution, the performing addressing message interaction between the master board and the corresponding slave board further includes: the master board judges whether the slave board addressing preparation completion information is received or not;
if the master board judges that the slave board addressing preparation is not completed or the slave board response is overtime, the addressing fails and the addressing function is finished; if the slave plate addressing preparation is completed and the slave plate reply is not timed out, address information is periodically sent.
As a further technical scheme, the CAN message addressing and the hard-line address information checking specifically include:
and after the slave board receives the address information message of the master board, checking and judging whether the message address information is equal to the hard-wire PWM input frequency or not, writing the address into the corresponding slave board if the check is passed, and replying the message and writing the address to finish the process.
As a further technical solution, after the master board receives the slave board write address, it is determined whether the slave board is smaller than the number of slave boards written by the upper computer, and if the slave board is smaller than the number of slave boards written by the upper computer, the following steps are required:
the master board periodically sends a message enabling slave board addressing output pins, whether the slave board replies overtime is judged, if the reply overtime is judged, the addressing fails, and the addressing function is ended;
if the slave board replies that the time is not out, after the slave board receives the output enabling message, the addressing enabling pin outputs high level, and meanwhile, the master board replies that the addressing output pin is enabled.
As a further technical scheme, the upper computer operates to enter an addressing mode to address all slave boards, the addresses of all the slave boards are guaranteed to be unique, the addressing mode exits after the addresses are successfully addressed, and all the slave boards enter a normal APP function mode.
In a second aspect, a system for master-slave distributed battery management is disclosed, comprising: the system comprises a main board, a plurality of slave boards and an upper computer;
the master board and the slave boards are low-voltage, each controller is initialized to enter an addressing mode, and the upper computer writes the number of the slave boards;
the master board and each slave board carry out interactive handshake through broadcast frames; providing hard-line PWM frequency signals containing address information step by step through the main board and each slave board;
and the master board and the corresponding slave board carry out addressing message interaction, and after the CAN message addressing and the hard line address information verification are passed, the address information is written into the corresponding slave board, so that the automatic addressing of each slave board in sequence is realized.
The above one or more technical solutions have the following beneficial effects:
the invention can realize all addressing functions according to the strategy codes without an external hardware switch.
According to the invention, by configuring the hard-line PWM frequency (including address information) input signal, when the input signal is checked and matched with the CAN message write address information, the address CAN be written into the corresponding slave plate, so that the slave plate addressing accuracy and reliability are greatly improved.
The invention ensures the uniqueness of addressing through the one-question one-answer interaction of the CAN message and the verification of the hard line address information and the CAN message address information.
The invention can not only realize automatic addressing of all slave boards in sequence, but also ensure that all slave boards are addressed again after a certain battery pack is replaced after sale, avoid slave board address conflict and ensure that the slave board address is unique and the battery system can be used for normal communication.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are included to illustrate an exemplary embodiment of the invention and not to limit the invention.
FIG. 1 is a block diagram of a distributed battery management system according to an embodiment of the present invention;
FIG. 2 is a flow chart of addressing from a board according to an embodiment of the present invention;
fig. 3 is a diagram of cascade connection of the PWM frequency driving between the slave boards of the motherboard according to the embodiment of the present invention.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
The embodiments and features of the embodiments of the invention may be combined with each other without conflict.
Interpretation of terms:
BMU：Battery Manage Unit。
BCU：Battery Control Unit。
example one
In order to realize addressing of each slave board control unit, the embodiment discloses an automatic addressing control method for a master-slave distributed battery management system.
The invention is based on a master-slave distributed battery management system, which comprises N slave boards for explanation, and the specific steps are shown in the following figure 2:
the method comprises the following steps: the master board and each slave board are low-voltage, each controller is initialized to enter an addressing mode, and an upper computer writes the number N of the slave boards;
step two: the mainboard sends out a broadcast message through the CAN, address bits are initialized to 1 after all slave boards receive the broadcast message, and normal communication between the mainboard and the slave boards is represented; after a certain time delay (ensuring that a message is sent out), the mainboard outputs an address information-containing frequency value of 10Hz through PWM drive, and outputs a PWM signal after a certain time delay;
step three: sending a query message in a master-slave period, judging whether the slave board replies without overtime and whether the master board finishes addressing (i is equal to N), if i is equal to N or the slave board replies overtime, failing to address, and finishing the addressing function;
step four: if i is less than N and the slave board communication is not overtime, the addressing is not finished, the slave board i (i starts from 1) correspondingly receives the PWM frequency, and when the slave board judges whether the address bit is 1 and the PWM input frequency is i x 10Hz, the slave board i replies addressing preparation ok through the CAN; the master board judges whether an addressing preparation ok is received from the slave board i or not;
step five: if the master board judges that addressing preparation ok of the slave board i is not received or the slave board replies overtime, addressing fails, and the addressing function is finished; if the slave board i receives addressing preparation ok and the slave board replies no overtime, periodically sending address information;
step six: after the slave board i receives the address information message of the master board, checking and judging whether the message address information i is equal to the hard line PWM input frequency/10 Hz to determine that the addressed slave board i corresponds to the addressed value i, and if the check is not passed, continuing the fifth step to the sixth step;
step seven: the verification is completed by writing the address into the corresponding slave board i and replying the message to write the address, and if the reply is not completed, the fifth step to the seventh step are continued;
step eight: after the master board receives the address writing completion of the slave board i, judging whether the slave board i is smaller than N;
step nine: when the plate i is smaller than N:
the master board periodically sends a message enabling the slave board i to address the output pins, whether the slave board replies overtime is judged, if the reply overtime is judged, the addressing fails, and the addressing function is ended;
if the slave board replies that the time is not out, after receiving the output enabling message, the slave board outputs a high level by an addressing enabling pin, and replies an addressing output pin enabling ok of the master board at the same time; if No _ ok is recovered from the board, repeat the above two steps; the motherboard is connected with the following figure 3 by addressing enabling pins between the boards;
step ten: when the slave board i is larger than or equal to N, the addressing is finished, and the flag bit for successful addressing of the master board is 1;
step eleven: and the addressing function is finished, and the addressing mode is exited.
The addressing function of the invention can only be operated to enter an addressing mode through the offline of the battery pack or after-sale service, so that all slave boards are addressed, and the unique addresses of all slave boards are ensured. And after the addressing is successful, exiting the addressing mode and entering a normal APP function mode.
The method enters the addressing mode through the operation of the upper computer, and avoids the signal detection and interaction influence of the conventional APP function on the mode.
According to the invention, by configuring the hard-line PWM frequency (including address information) input signal, when the input signal is checked and matched with the CAN message write address information, the address CAN be written into the corresponding slave plate, so that the slave plate addressing accuracy and reliability are greatly improved.
According to the invention, the uniqueness of addressing is ensured through the one-question one-answer interaction of the CAN message and the verification of the hard line address information and the CAN message address information;
the invention writes the number N of the battery packs into the upper computer, and polls to address each slave plate, thereby ensuring that each slave plate is successfully addressed in sequence.
Example two
The purpose of this embodiment is to provide and disclose a battery management system for master-slave distribution type, including: the system comprises a main board, a plurality of slave boards and an upper computer;
the master board and each slave board are low-voltage powered, each controller is initialized to enter an addressing mode, and an upper computer writes the number of the slave boards;
the master board and each slave board carry out interactive handshake through broadcast frames; providing hard-line PWM frequency signals containing address information step by step through the main board and each slave board;
and the master board and the corresponding slave board carry out addressing message interaction, and after the CAN message addressing and the hard-line address information verification pass, the address information is written into the corresponding slave board, so that the slave boards are automatically addressed in sequence.
For specific coding control, refer to the detailed description in the first embodiment, and are not repeated herein.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. The automatic addressing control method for the master-slave distributed battery management system is characterized by comprising the following steps:
the master board and each slave board carry out interactive handshake through broadcast frames;
providing hard-line PWM frequency signals containing address information step by step through the main board and each slave board;
and the master board and the corresponding slave board carry out addressing message interaction, and after the CAN message addressing and the hard line address information verification are passed, the address information is written into the corresponding slave board, so that the automatic addressing of each slave board in sequence is realized.
2. The automatic addressing control method for the master-slave distributed battery management system according to claim 1, wherein before the master board and the slave boards are subjected to broadcast frame interactive handshake, low voltages are applied to the master board and the slave boards, controllers of the master board and the slave boards are initialized to enter an addressing mode, and the upper computer writes the number of the slave boards.
3. The automatic addressing control method for a master-slave distributed battery management system as claimed in claim 1, wherein the hard-line PWM frequency signal containing address information is provided stage by stage through the master board and each slave board, and comprises:
the mainboard sends out a broadcast message through the CAN, address bits are initialized to a numerical value after all slave boards receive the broadcast message, and normal communication between the mainboard and the slave boards is represented; after the message is sent out by delaying for a certain time, the mainboard outputs an address information frequency value through PWM driving, and outputs a PWM signal by delaying for a certain time.
4. The automatic addressing control method for a master-slave distributed battery management system according to claim 1, characterized in that the master board performs addressing message interaction with the corresponding slave board, in particular by CAN message one-question-one-answer interaction.
5. The automatic addressing control method for the master-slave distributed battery management system according to claim 1 or 4, wherein the master board and the corresponding slave board perform addressing message interaction, and specifically comprises:
sending a query message in a master-slave period, judging whether the slave board replies before timeout and whether the master board finishes addressing, and if the slave board replies before timeout or the slave board finishes addressing, failing to address and ending the addressing function;
if addressing is not finished and the slave board communication is not overtime, addressing is not finished, any slave board correspondingly receives the PWM frequency, the slave board judges the address bit and the PWM input frequency, and the requirement is met, the slave board replies the addressing preparation through the CAN.
6. The automatic addressing control method for the master-slave distributed battery management system according to claim 5, wherein the addressing message interaction between the master board and the corresponding slave board further comprises: the master board judges whether the slave board addressing preparation completion information is received or not;
if the master board judges that the slave board addressing preparation is not completed or the slave board response is overtime, the addressing fails and the addressing function is finished; if the slave plate addressing preparation is completed and the slave plate reply is not timed out, address information is periodically sent.
7. The automatic addressing control method for the master-slave distributed battery management system according to claim 1, wherein the CAN message addressing and the hard-line address information verification are specifically as follows:
and after the slave board receives the address information message of the master board, checking and judging whether the message address information is equal to the hard-wire PWM input frequency or not, if the message address information passes the check, writing the address into the corresponding slave board, and replying the message to write the address.
8. The automatic addressing control method for the master-slave distributed battery management system according to claim 7, wherein the master board determines whether the slave board is smaller than the number of slave boards written by the upper computer after receiving the completion of writing the address of the slave board, and if so, the following steps are required:
the master board periodically sends a message enabling slave board addressing output pins, whether the slave board replies overtime is judged, if the reply overtime is judged, the addressing fails, and the addressing function is ended;
if the slave board replies that the time is not out, after the slave board receives the output enabling message, the addressing enabling pin outputs high level, and meanwhile, the master board replies that the addressing output pin is enabled.
9. The automatic addressing control method for the master-slave distributed battery management system according to claim 2, characterized in that the upper computer operates to enter an addressing mode to address all slave boards, so as to ensure that all slave boards have unique addresses, and after the addressing is successful, the addressing mode is exited, and all slave boards enter a normal APP function mode.
10. The master-slave distributed battery management system is characterized by comprising: the system comprises a main board, a plurality of slave boards and an upper computer;
the master board and the slave boards are low-voltage, each controller is initialized to enter an addressing mode, and the upper computer writes the number of the slave boards;
the master board and each slave board carry out interactive handshake through broadcast frames; providing hard-line PWM frequency signals containing address information step by step through the main board and each slave board;
and the master board and the corresponding slave board carry out addressing message interaction, and after the CAN message addressing and the hard-line address information verification pass, the address information is written into the corresponding slave board, so that the slave boards are automatically addressed in sequence.
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