CN111586210A - Multichannel CAN bus OBD diagnostic protocol conversion device - Google Patents
Multichannel CAN bus OBD diagnostic protocol conversion device Download PDFInfo
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- CN111586210A CN111586210A CN202010323662.8A CN202010323662A CN111586210A CN 111586210 A CN111586210 A CN 111586210A CN 202010323662 A CN202010323662 A CN 202010323662A CN 111586210 A CN111586210 A CN 111586210A
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- obd
- bus
- controller
- protocol conversion
- communication module
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/40—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/08—Protocols for interworking; Protocol conversion
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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
Abstract
The invention discloses a multi-channel CAN bus OBD diagnosis protocol conversion device. It includes first CAN passageway, a plurality of second CAN passageway, CAN communication module and controller, CAN communication module connects the whole car through first CAN passageway, through a plurality of second CAN passageway connections, CAN communication module's data transmission end connection director's data transmission end, the controller is used for acquireing the OBD agreement that whole car supported, be used for detecting behind the request of OBD diagnostic equipment will the request converts the OBD agreement format that whole car supported to and sends to whole car, be used for obtaining behind the response information of whole car will response information converts the format that OBD diagnostic equipment requested into. The conversion device is provided with a plurality of CAN channels, CAN realize multi-path CAN communication with the whole vehicle, and CAN meet the requirements of different vehicle configurations; the invention supports the conversion of various standard OBD diagnostic protocols, simultaneously meets the requirements of responding to the OBD diagnostic equipment request by serving as a lower computer and carrying out OBD diagnosis work on the whole vehicle by serving as an upper computer, and has strong universality.
Description
Technical Field
The invention belongs to the technical field of automobiles, and particularly relates to a multi-channel CAN bus OBD diagnosis protocol conversion device.
Background
Under the environment of comprehensive implementation of the national six-emission regulation, commercial vehicles meeting the national five-emission regulation and the national six-emission regulation are sold and annual inspection work simultaneously on the market. According to the requirements of GB3847 and GB7258 regulations, the OBD information inspection meeting the requirements of the regulations is required during the process of selling or annual inspection of commercial vehicles and commercial vehicles.
The OBD diagnostic protocols currently used in commercial vehicles on the market mainly comprise ISO15765, SAEJ1939, ISO27145 and other diagnostic protocols. Most general OBD diagnostic tools in the market only have good support degree to ISO15765, and have incomplete or non-supported support degrees to SAEJ1939 and ISO27145, so that when the OBD diagnostic tools of the type are used for detecting commercial vehicles, detection failure and failure phenomena can occur.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a multi-path CAN bus OBD diagnosis protocol conversion device which CAN effectively solve the problem that a general OBD diagnosis tool fails in OBD diagnosis of a commercial vehicle.
The technical scheme adopted by the invention is as follows: the utility model provides a multichannel CAN bus OBD diagnostic protocol conversion equipment, includes first CAN passageway, a plurality of second CAN passageway, CAN communication module and controller, CAN communication module connects OBD diagnostic equipment through first CAN passageway, and CAN communication module connects whole car through a plurality of second CAN passageways, and CAN communication module's data transmission end connection director's data transmission end, the controller is used for obtaining the OBD agreement that whole car supported from a plurality of second CAN passageways for will after detecting OBD diagnostic equipment's request the request is converted to the OBD agreement form that whole car supported and is sent to whole car, be used for obtaining after the response information of whole car will response information converts the form that OBD diagnostic equipment requested to send OBD diagnostic equipment to OBD diagnostic equipment through first CAN passageway.
Further, the process of the controller acquiring the OBD protocol supported by the entire vehicle is as follows: and the controller respectively applies work on the second CAN channels according to a certain sequence according to the OBD protocols and CAN address the requests, accesses the whole vehicle ECU which replies the positive response, and acquires and records the OBD protocol information supported by the whole vehicle ECU.
Further, the controller comprises a plurality of first protocol stack modules, and the plurality of first protocol stack modules are used for converting a plurality of pieces of response information of the whole vehicle into a format requested by the OBD diagnostic equipment.
Further, the controller comprises a plurality of second protocol stack modules, and the plurality of second protocol stack modules are used for converting the request of the OBD diagnosis device into an OBD protocol format supported by the whole vehicle.
Further, the OBD protocol supported by the whole vehicle comprises ISO15765, ISO27145 and SAEJ 1939.
Furthermore, one end of the first CAN channel is connected with OBD diagnosis equipment through a standard OBD-II interface.
Furthermore, one end of the second CAN channel is connected with the whole vehicle through a standard OBD-II interface.
Furthermore, the number of the second CAN channels is two, and each second CAN channel is connected with a plurality of different ECU of the whole vehicle.
Furthermore, the controller also comprises a first power module, the first power module is respectively connected with the CAN communication module and the controller, and the first power module is used for providing power for the CAN communication module and the controller.
Furthermore, the OBD diagnosis device further comprises a second power module, wherein the output end of the second power module is connected with the power supply end of the OBD diagnosis device, and the second power module is used for supplying power to the OBD diagnosis device.
The conversion device is provided with a plurality of CAN channels, CAN realize multi-path CAN communication with the whole vehicle, and CAN meet the requirements of different vehicle configurations; the invention supports the conversion of various standard OBD diagnostic protocols such as ISO15765, SAEJ1939 and ISO27145, simultaneously meets the requirement of responding to OBD diagnostic equipment requests by serving as a lower computer and the requirement of carrying out OBD diagnostic request work on the whole vehicle by serving as an upper computer, and has strong universality. The OBD diagnosis protocol conversion device can effectively solve the problem that the general OBD diagnosis tool fails in OBD diagnosis of the commercial vehicle.
Drawings
Fig. 1 is a schematic diagram of the principle of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, the present invention provides a multi-channel CAN bus OBD diagnostic protocol conversion apparatus, which includes a first CAN channel 1, a plurality of second CAN channels 2, a CAN communication module 3 and a controller 4, wherein the CAN communication module 3 is connected to an OBD diagnostic device through the first CAN channel 1, the CAN communication module 3 is connected to a vehicle through the plurality of second CAN channels 2, a data transmission end of the CAN communication module 3 is connected to a data transmission end of the controller 4, the controller 4 is configured to obtain an OBD protocol supported by the vehicle from the plurality of second CAN channels 2, convert a request into an OBD protocol format supported by the vehicle after detecting the request of the OBD diagnostic device, and transmit the OBD protocol format to the vehicle, and convert the response information into a format requested by the OBD diagnostic device after obtaining the response information of the vehicle, and transmit the OBD diagnostic device to the OBD diagnostic device through the first CAN channel 1.
In the above scheme, the process of the controller 4 acquiring the OBD protocol supported by the entire vehicle is as follows: and the controller respectively performs work on a plurality of second CAN channels according to a plurality of OBD protocols in a certain sequence, such as the sequence of ISO 15765-ISO 27145-SAEJ 1939, so as to meet the addressing request, accesses the whole vehicle ECU which replies a positive response, and acquires and records OBD protocol information supported by the whole vehicle ECU.
In the above scheme, the controller 4 includes a plurality of first protocol stack modules 4.1 and a plurality of second protocol stack modules 4.2, the plurality of first protocol stack modules 4.1 are used for converting a plurality of response information of the whole vehicle into the format of the request of the OBD diagnostic device, and the plurality of second protocol stack modules 4.2 are used for converting the request of the OBD diagnostic device into the OBD protocol format supported by the whole vehicle.
In the above solution, the OBD protocol supported by the entire vehicle includes, but is not limited to, ISO15765, ISO27145, SAEJ1939, and the like, that is, the protocol conversion device supports ISO15765, ISO27145, and SAEJ1939, and the OBD detection device may use any one of these protocols to complete communication.
In the scheme, one end of the first CAN channel 1 and one end of the second CAN channel 2 are respectively connected with OBD diagnosis equipment and the whole vehicle through standard OBD-II interfaces, so that the universality is high.
In the scheme, two second CAN channels 2 are arranged, each second CAN channel is connected with a plurality of different vehicle ECUs, OBD information on the vehicle is generally positioned in different ECUs, and different ECUs CAN be connected with different CAN channels.
In the above scheme, the controller further comprises a first power module 5 and a second power module 6, the first power module 5 is respectively connected with the CAN communication module 3 and the controller 4, and the first power module 5 is used for providing power for the CAN communication module 3 and the controller 4; the output end of the second power module 6 is connected with the power supply end of the OBD diagnostic device, and the second power module 6 is used for supplying power to the OBD diagnostic device.
The protocol conversion device can effectively convert the request of the general OBD diagnostic protocol into the diagnostic protocol supported by each ECU by acquiring and analyzing the OBD diagnostic protocol information of the ECU of the whole vehicle, and then respond the diagnostic information to the OBD diagnostic tool after acquiring the effective information from the ECU, thereby completing the diagnostic request work of the OBD diagnostic tool.
And after the protocol conversion device is electrified, OBD diagnostic protocol communication detection is carried out on the ECUs on the multi-path CAN, and the types of diagnostic protocols supported by the ECUs are obtained and recorded. After receiving the diagnosis request of the OBD diagnosis tool, analyzing the diagnosis command, comparing the diagnosis protocol of each ECU by looking up the table (namely the OBD protocol support information of all ECUs on 2 channels of the whole vehicle recorded in the front), converting the request into a protocol format supported by the corresponding ECU, transmitting the diagnosis request of the OBD diagnosis tool to the corresponding ECU, converting the diagnosis request into a format requested by the OBD detection equipment after obtaining the diagnosis response of the ECU, and feeding back the diagnosis response to the OBD diagnosis tool to complete the work of the diagnosis request.
Taking a certain vehicle type as an example, the OBD detection device requests to read CVN (calibration version Number) code information of the whole vehicle through an ISO15031 protocol, and the information has two ECUs (ECU1, ECU2) supporting reading of the information in one of the second CAN channels, and supports reading using ISO15031 and SAEJ1939 respectively; on the other second CAN channel there is an ECU (ECU3) supporting reading using ISO 27145. If the OBD diagnostic tool is directly used to read the diagnostic information of the DCU, the OBD diagnostic tool may fail to read the diagnostic information because it does not support reading of one of the second CAN channels.
After the protocol conversion device provided by the invention is used, after being powered on, the protocol conversion device respectively uses three protocols of ISO15031, SAEJ1939 and ISO27145 on two second CAN channels to request the ECU1, the ECU2 and the ECU3 to read and record CVN information. When the OBD diagnosis tool requests diagnosis information, the diagnosis command is analyzed into diagnosis commands of corresponding SAEJ1939 and ISO27145 diagnosis protocols after analysis, response information of the three ECUs is obtained, the diagnosis responses are converted into ISO15031 diagnosis responses after the diagnosis responses of all the ECUs are received, and the diagnosis responses are sent to OBD diagnosis equipment to complete diagnosis request work. The protocol conversion is not carried out on the ECU1, and the protocol conversion between ISO15031-SAEJ1939 is completed on the ECU 2; the protocol conversion between ISO15031-ISO27145 is completed for the ECU 3.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (10)
1. The utility model provides a diagnostic protocol conversion equipment of multichannel CAN bus OBD which characterized in that: including first CAN passageway, a plurality of second CAN passageway, CAN communication module and controller, CAN communication module connects OBD diagnostic equipment through first CAN passageway, and CAN communication module connects whole car through a plurality of second CAN passageways, and CAN communication module's data transmission end connection director's data transmission end, the controller is used for obtaining the OBD agreement that whole car supported from a plurality of second CAN passageways for will after the request that detects OBD diagnostic equipment the request converts the OBD agreement format that whole car supported into and sends to whole car, be used for after the response information who obtains whole car will the format that response information converts OBD diagnostic equipment request sends to OBD diagnostic equipment through first CAN passageway.
2. The multi-CAN bus OBD diagnostic protocol conversion apparatus of claim 1, wherein: the process that the controller acquires the OBD protocol supported by the whole vehicle is as follows: and the controller respectively applies work on the second CAN channels according to a certain sequence according to the OBD protocols and CAN address the requests, accesses the whole vehicle ECU which replies the positive response, and acquires and records the OBD protocol information supported by the whole vehicle ECU.
3. The multi-CAN bus OBD diagnostic protocol conversion apparatus of claim 1, wherein: the controller comprises a plurality of first protocol stack modules, and the first protocol stack modules are used for converting a plurality of pieces of response information of the whole vehicle into a format requested by the OBD diagnostic equipment.
4. The multi-CAN bus OBD diagnostic protocol conversion apparatus of claim 1, wherein: the controller comprises a plurality of second protocol stack modules, and the plurality of second protocol stack modules are used for converting the request of the OBD diagnosis equipment into an OBD protocol format supported by the whole vehicle.
5. The multi-CAN-bus OBD diagnostic protocol conversion apparatus of claim 1 or 4, wherein: the OBD protocol supported by the whole vehicle comprises ISO15765, ISO27145 and SAEJ 1939.
6. The multi-CAN bus OBD diagnostic protocol conversion apparatus of claim 1, wherein: one end of the first CAN channel is connected with OBD diagnosis equipment through a standard OBD-II interface.
7. The multi-CAN bus OBD diagnostic protocol conversion apparatus of claim 1, wherein: one end of the second CAN channel is connected with the whole vehicle through a standard OBD-II interface.
8. The multi-CAN bus OBD diagnostic protocol conversion apparatus of claim 1, wherein: the number of the second CAN channels is two, and each second CAN channel is connected with a plurality of different ECU of the whole vehicle.
9. The multi-CAN bus OBD diagnostic protocol conversion apparatus of claim 1, wherein: the CAN communication module is connected with the controller, and the first power module is used for providing power for the CAN communication module and the controller.
10. The multi-CAN bus OBD diagnostic protocol conversion apparatus of claim 1, wherein: the OBD diagnosis device further comprises a second power module, the output end of the second power module is connected with the power supply end of the OBD diagnosis device, and the second power module is used for supplying power to the OBD diagnosis device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010323662.8A CN111586210A (en) | 2020-04-22 | 2020-04-22 | Multichannel CAN bus OBD diagnostic protocol conversion device |
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| CN202010323662.8A CN111586210A (en) | 2020-04-22 | 2020-04-22 | Multichannel CAN bus OBD diagnostic protocol conversion device |
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| CN111586210A true CN111586210A (en) | 2020-08-25 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113341939A (en) * | 2021-08-04 | 2021-09-03 | 北京智科车联科技有限公司 | Vehicle offline detection system and method |
| CN113872967A (en) * | 2021-09-27 | 2021-12-31 | 深圳市元征科技股份有限公司 | Vehicle information transmission method and device, electronic equipment and storage medium |
| CN114584590A (en) * | 2022-03-08 | 2022-06-03 | 奇瑞汽车股份有限公司 | Data transmission method, system, device and storage medium |
| CN114979239A (en) * | 2022-05-24 | 2022-08-30 | 深圳市元征科技股份有限公司 | Remote diagnosis method, device and related equipment |
| CN115633044A (en) * | 2022-07-20 | 2023-01-20 | 广州汽车集团股份有限公司 | Message processing method and device, electronic equipment and storage medium |
| CN113872967B (en) * | 2021-09-27 | 2024-04-30 | 深圳市元征科技股份有限公司 | Vehicle information transmission method and device, electronic equipment and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115633044B (en) * | 2022-07-20 | 2024-01-19 | 广州汽车集团股份有限公司 | Message processing method and device, electronic equipment and storage medium |
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