CN113884895A - CAN bus-Ethernet data conversion device and method for battery test - Google Patents
CAN bus-Ethernet data conversion device and method for battery test Download PDFInfo
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 53
- 238000012360 testing method Methods 0.000 title claims abstract description 40
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- 230000002457 bidirectional effect Effects 0.000 claims abstract description 30
- 238000004891 communication Methods 0.000 claims description 45
- 238000004806 packaging method and process Methods 0.000 claims description 15
- 238000013506 data mapping Methods 0.000 claims description 8
- 238000013507 mapping Methods 0.000 claims description 8
- 238000007405 data analysis Methods 0.000 claims description 6
- 238000005538 encapsulation Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 abstract description 19
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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Abstract
The invention discloses a CAN bus-Ethernet data conversion device for battery test, which comprises a bidirectional conversion device, a power supply, an Ethernet interface and a CAN card, wherein the power supply, the Ethernet interface and the CAN card are connected with the bidirectional conversion device; also discloses a data bidirectional conversion method; the invention CAN meet the constantly increasing and changing data processing requirements of the CAN acquisition and control equipment of customers, thereby greatly improving the flexible expansibility of the software of the power battery charging and discharging test equipment and reducing the development and hardware cost of a large number of integrated designs.
Description
Technical Field
The invention belongs to the technical field of power battery charging and discharging tests, and particularly relates to a multi-path CAN bus and Ethernet data bidirectional conversion device in a battery test and a data bidirectional conversion method thereof.
Background
In the process of power battery charging and discharging test, the charging and discharging test equipment often needs to communicate with a battery management system (BMS, BMU) and other third-party acquisition or control equipment, as shown in fig. 1, and most of the equipment, especially the power battery and related equipment of new energy vehicle enterprises, adopt a CAN communication mode to receive and transmit data, the equipment is numerous, and baud rates are inconsistent, so that the equipment is difficult to integrate into a CAN network.
The general solution is to extend a CAN port at a bottom control circuit board end in a charging and discharging test device, but because the CAN port extended by the control circuit board is very limited, the general power battery charging and discharging test device extended and integrated third-party CAN bus device architecture diagram is as shown in fig. 1: according to different baud rates and equipment types, the protocol types are classified to expand CAN ports, and CAN cards are continuously added to receive, transmit and integrate data.
However, the extended CAN ports of the bottom control circuit board of the testing device are very limited, and when the number of the integrated third-party CAN bus devices exceeds a certain number, an extended bottleneck CAN occur. Therefore, how to meet the data parallel transceiving processing requirement of the charging and discharging test equipment integrating multiple paths of CAN ports as much as possible on the premise of limited extension is an urgent subject faced by the power battery charging and discharging test equipment.
Disclosure of Invention
The invention aims to overcome the limited expansion limit of CAN port data receiving and transmitting of the traditional power battery charging and discharging test equipment and provides a CAN bus and Ethernet data multi-path bidirectional conversion device in battery test.
The technical scheme adopted by the invention for solving the technical problems is as follows: a CAN bus-Ethernet data conversion device for battery testing comprises a bidirectional conversion device, a power supply, an Ethernet interface and a CAN card, wherein the power supply, the Ethernet interface and the CAN card are connected with the bidirectional conversion device, the bidirectional conversion device is composed of a communication parameter configuration module, a CAN data analysis module, a CAN data transceiving module, a data mapping and packaging module and a UDP data transceiving module, the plurality of CAN cards are connected with the bidirectional conversion device through a PCI bus or a USB bus respectively, the CAN card is connected with an aviation plug for CAN communication, and a reserved part is enough for a communication joint of CAN equipment to be expanded, the Ethernet network interface and the power supply interface.
The CAN bus-Ethernet data conversion device for the battery test has the advantages that the added or expanded CAN card supports CAN communication cards which are not limited to interfaces of domestic peripheral work or USB, PCI and the like of imported Vector companies.
The invention also provides a CAN bus-Ethernet data conversion method for battery test, which comprises the following steps:
and 7, continuously detecting and receiving UDP data and analyzing the data, packaging and packaging the data according to rules, loading the data into a CAN sending cache region, and sending the data to different CAN ports of CAN card equipment of different targets at different baud rates through CAN communication according to a CAN communication parameter list table.
And step 8, based on the above processes, completely realizing the multi-channel bidirectional conversion of the CAN bus and the Ethernet data.
According to the CAN bus-Ethernet data conversion method for the battery test, the CAN communication parameter list is configured, stored and read by an xml file, a local UDP port number is configured by int32 data, and the list is supported, so that the method CAN be expanded infinitely theoretically.
The CAN bus-Ethernet data conversion method for the battery test comprises the following steps that: CAN port belongs to upper layer CAN application software Name (CanApp _ Name, data type: string), CAN port belongs number (articleNumber, data type: Uint 32), CAN port belongs to serial number (serialNumber, data type: Uint 32), CAN port channel handle (hwChannel, data type: byte), CAN port communication baud rate (bitrate, data type: Uint 32), CAN port channel Name (ChannelName, data type: string), target ip (destip, data type: string) of CAN port mapping, target UDP port (destport, data type: int 32) of CAN port mapping.
In the CAN bus-ethernet data conversion method for battery test, the encapsulation rules in step 6 and step 7 obey the following convention:
an Ethernet UDP packet containing 1-50 CAN frames;
one CAN contains 13 bytes;
the length of the highest byte representation frame information is 1 byte, and the highest byte representation frame information is used for identifying some information of the CAN frame, such as type, length and the like; d0, D1, D2 and D3 correspond to the lowest bit0 to the highest bit7 in sequence, and a reserved bit, RTR and FF are reserved; wherein D3-D0 identify the data length of the CAN frame; wherein the reserved bit value is 0, and 1 cannot be written; wherein RTR is the identification of the remote frame and the data frame, 1 is the remote frame, 0 is the data frame; wherein FF is the mark of the standard frame and the extended frame, 1 is the extended frame, and 0 is the standard frame;
from the lowest byte, bytes 9 to 12 represent the frame ID, the length of which is 4 bytes, the standard frame valid bit is 11 bits, and the extended frame valid bit is 29 bits;
the 9 th to 12 th bytes represent frame data having a length of 8 bytes from the lowest byte, and the effective length is determined by the values of D3-D0 of the frame information
The invention has the beneficial effects that:
the device does not need to continuously expand CAN ports on a bottom control circuit board of the power battery charging and discharging test equipment, but utilizes a data conversion device to parallelly convert all CAN data into CAN cards, when a PC is used as a bidirectional conversion device, the CAN cards are connected into the PC, the data are sorted by port separation software of the PC and converted into Ethernet data packets which CAN be recognized by a power battery charging and discharging test equipment controller according to a certain rule, mapping management is well carried out, the Ethernet UDP communication bridges the bottom control board, the CAN bus and the Ethernet data are converted in a multi-path and bidirectional mode, and the CAN bus and the Ethernet data multi-path data interaction of the charging and discharging test equipment controller and external equipment in the whole test process is completed.
The method CAN meet the constantly increasing and changing data processing requirements of the CAN acquisition and control equipment of customers, thereby greatly improving the flexible expansibility of the software of the power battery charging and discharging test equipment and reducing the development and hardware cost of a large number of integrated designs.
Drawings
FIG. 1 is an architecture diagram of a third-party CAN device for testing and extending the charging and discharging of a conventional power battery;
FIG. 2 is a schematic structural diagram of a data conversion device according to the present invention;
FIG. 3 is a diagram of a system architecture to which the data conversion device of the present invention is applied;
FIG. 4 is an example of the software configuration of the system of the apparatus of the present invention;
fig. 5 is a diagram of the actual effect of low-delay data transceiving of the device of the present invention.
The figures are numbered: the system comprises a bidirectional conversion device 1, a communication parameter configuration module 11, a CAN data analysis module 12, a CAN data receiving and transmitting module 13, a data mapping and packaging module 14, a UDP data receiving and transmitting module 15, a power supply 2, an Ethernet interface 3, a CAN card 4 and a CAN communication aviation plug 5.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the embodiments.
Referring to fig. 2 and 3, the multi-path bidirectional conversion device for the CAN bus and the ethernet data in the battery test disclosed by the invention comprises a bidirectional conversion device 1, a power supply 2 connected with the bidirectional conversion device 1, an ethernet interface 3 and a CAN card 4, wherein the bidirectional conversion device 1 is loaded with a self-developed communication parameter configuration module 11, a CAN data analysis module 12, a CAN data transceiver module 13, a data mapping encapsulation module 14 and a UDP data transceiver module 15, the plurality of CAN cards 4 are respectively connected with the bidirectional conversion device 1 through a PCI bus or a USB bus, and the CAN card 4 is connected with a Controller Area Network (CAN) communication aviation plug 5. A communication connector, an Ethernet network interface and a power supply interface of the CAN equipment to be expanded are reserved in the reserved part
The added or expanded CAN card 4 supports CAN communication cards of interfaces such as USB, PCI and the like which are not limited to homemade Zhouyou power or imported Vector companies.
The CAN bus and Ethernet data multi-path bidirectional data conversion device overcomes the limited expansion limit of the data receiving and transmitting of the CAN port of the traditional power battery charging and discharging test equipment, does not need to continuously expand the CAN port on the bottom control circuit board of the power battery charging and discharging test equipment, and when a PC is used as the bidirectional conversion device 1, all CAN data are connected to a PC through a CAN card in parallel by using the device, then the data are sorted by port by using PC terminal software and converted into Ethernet data packets which CAN be recognized by a power battery charging and discharging test equipment controller according to a certain rule, mapping management is performed, and the Ethernet UDP communication bridge is used for bridging the bottom control panel, so that the multi-path bidirectional conversion flow of the CAN bus and the Ethernet data is realized, and the multi-path data interaction of the CAN bus of the charging and discharging test equipment controller and the external equipment and the Ethernet data in the whole test process is completed. The method meets the continuously increasing and changing data processing requirements of the CAN acquisition and control equipment of the client, thereby greatly improving the flexible expansibility of the software of the power battery charging and discharging test equipment and reducing the development and hardware cost of a large number of integrated designs.
The invention discloses a data conversion method of a CAN bus-Ethernet data conversion device for battery test, which comprises the following steps:
And 3, powering on the power supply 2.
And 4, operating the relevant software modules, and configuring the CAN communication parameter list tables of all the extended CAN cards 4 in the software modules of the communication parameter configuration software module 11.
And 5, starting an initialization program, initializing and starting the receiving and transmitting threads of the CAN and the UDP.
And 6, starting the communication parameter configuration module 11, continuously detecting and receiving data of each online CAN port, analyzing the data, packaging and packaging the data according to rules, loading the data into an Ethernet sending buffer area, and sending the data to different target ip and target ports in a UDP (user datagram protocol) mode according to a CAN communication parameter list table.
And 7, continuously detecting and receiving UDP data and analyzing the data, packaging and packaging the data according to rules, loading the data into a CAN sending cache region, and sending the data to different CAN ports of CAN card equipment of different targets at different baud rates through CAN communication according to a CAN communication parameter list table.
And step 8, based on the above processes, completely realizing the multi-channel bidirectional conversion of the CAN bus and the Ethernet data.
As shown in fig. 4, the CAN communication parameter list is configured and stored and read by an xml file, and may configure a local UDP port number, a data type: int32, support list, is theoretically infinitely scalable.
The list subordinate node ITEM node comprises: CAN port belongs to upper layer CAN application software Name (CanApp _ Name, data type: string), CAN port belongs number (articleNumber, data type: Uint 32), CAN port belongs to serial number (serialNumber, data type: Uint 32), CAN port channel handle (hwChannel, data type: byte), CAN port communication baud rate (bitrate, data type: Uint 32), CAN port channel Name (ChannelName, data type: string), target ip (destip, data type: string) of CAN port mapping, target UDP port (destport, data type: int 32) of CAN port mapping.
Further, the encapsulation rules in step 6 and step 7 obey the following convention:
(1) an ethernet UDP packet contains a number of CAN frames, up to 50, and a minimum of 1.
(2) One CAN contains 13 bytes.
(3) The highest byte represents frame information, the length of which is 1 byte, and is used for identifying some information of the CAN frame, such as type, length and the like. From the least significant bit0 to the most significant bit7, corresponding to D0, D1, D2 and D3 in sequence, reserved bits, RTR and FF. FF is the identification of the standard frame and the extended frame, 1 is the extended frame, and 0 is the standard frame. RTR is the identification of the remote frame and the data frame, 1 is the remote frame, and 0 is the data frame. The reserved value is 0 and 1 cannot be written. D3-D0: the data length of the CAN frame is identified.
(4) The 9 th to 12 th bytes, counted from the lowest byte, characterize the frame ID, which is 4 bytes in length, the standard frame valid bit is 11 bits, and the extended frame valid bit is 29 bits.
(5) The 9 th to 12 th bytes represent frame data, which has a length of 8 bytes from the lowest byte, and the effective length is determined by the values of D3 to D0 of the frame information.
The foregoing is illustrative only and is not limiting, and any person skilled in the art can make changes or modifications to the disclosed technology to obtain equivalent variations, and it should be understood by those skilled in the art that any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention are intended to be covered by the appended claims.
Claims (6)
1. A CAN bus-Ethernet data conversion device for battery test is characterized in that: including two-way conversion equipment (1) and power supply (2), ethernet interface (3) and CAN card (4) be connected with two-way conversion equipment (1), two-way conversion equipment (1) constitute by communication parameter configuration module (11), CAN data analysis module (12), CAN data transceiver module (13), data mapping encapsulation module (14) and UDP data transceiver module (15), CAN card (4) have a plurality ofly, connect two-way conversion equipment (1) through PCI bus or USB bus respectively, CAN card (4) are connected CAN communication and are inserted (5) with aviation.
2. The CAN bus-Ethernet data conversion device for battery test as claimed in claim 1, wherein the CAN card (4) is a CAN communication card with USB and PCI interfaces.
3. A data conversion method of the CAN bus-ethernet data conversion apparatus for battery test according to claim 1, characterized by comprising the steps of:
step 1, expanding a CAN card (4) in a bidirectional conversion device (1) as required;
step 2, adding software modules corresponding to a communication parameter configuration module (11), a CAN data analysis module (12), a CAN data transceiving module (13), a data mapping encapsulation module (14) and a UDP data transceiving module (15) in the bidirectional conversion device (1);
step 3, electrifying the power supply (2);
step 4, operating related software modules, and configuring CAN communication parameter list tables of all extended CAN cards (4) in the software modules of the communication parameter configuration module (11);
step 5, initializing and starting the receiving and transmitting threads of the CAN and the UDP;
step 6, starting a communication parameter configuration module (11), continuously detecting and receiving data of each online CAN port, analyzing, packaging and packaging the data, loading the data into an Ethernet sending buffer area, and sending the data to different target ip and target ports in a UDP (user Datagram protocol) mode according to a CAN communication parameter list;
step 7, continuously detecting and receiving UDP data, analyzing, packaging and packaging the data, loading the data into a CAN sending cache area, and sending a CAN communication parameter list table to different CAN ports of different targets at different baud rates through CAN communication;
and step 8, based on the above processes, completely realizing the multi-channel bidirectional conversion of the CAN bus and the Ethernet data.
4. The method as claimed in claim 3, wherein the CAN communication parameter list is configured and stored and read by an xml file, configures a local UDP port number by int32 data, and supports the list.
5. The CAN bus-Ethernet data conversion method for battery test as recited in claim 4, wherein the list subordinate node ITEM node comprises: the CAN port belongs to the name of upper-layer CAN application software, the CAN port belongs to the number, the CAN port belongs to the serial number, the CAN port channel handle, the CAN port communication baud rate, the CAN port channel name, the CAN port mapping target ip and the CAN port mapping target UDP port.
6. The CAN bus-ethernet data conversion method for battery test according to claim 3, wherein the encapsulation rules in step 6 and step 7 obey the following convention:
an Ethernet UDP packet containing 1-50 CAN frames;
one CAN contains 13 bytes;
the length of the highest byte representation frame information is 1 byte, and the highest byte representation frame information is used for identifying some information of the CAN frame, such as type, length and the like; d0, D1, D2 and D3 correspond to the lowest bit0 to the highest bit7 in sequence, and a reserved bit, RTR and FF are reserved; wherein D3-D0 identify the data length of the CAN frame; wherein the reserved bit value is 0, and 1 cannot be written; wherein RTR is the identification of the remote frame and the data frame, 1 is the remote frame, 0 is the data frame; wherein FF is the mark of the standard frame and the extended frame, 1 is the extended frame, and 0 is the standard frame;
from the lowest byte, bytes 9 to 12 represent the frame ID, the length of which is 4 bytes, the standard frame valid bit is 11 bits, and the extended frame valid bit is 29 bits;
the 9 th to 12 th bytes represent frame data, which has a length of 8 bytes from the lowest byte, and the effective length is determined by the values of D3 to D0 of the frame information.
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