CN107846419B - Method and system for transmitting OBD data of vehicle engine - Google Patents
Method and system for transmitting OBD data of vehicle engine Download PDFInfo
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- CN107846419B CN107846419B CN201711365495.8A CN201711365495A CN107846419B CN 107846419 B CN107846419 B CN 107846419B CN 201711365495 A CN201711365495 A CN 201711365495A CN 107846419 B CN107846419 B CN 107846419B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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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
Abstract
The invention provides a transmission method of vehicle engine OBD data, which is used for solving the technical problem that the OBD data of an engine ECU (electronic control unit) cannot be transmitted because different ECUs use different protocols.
Description
Technical Field
The invention relates to the field of vehicle OBD data transmission, in particular to a method and a system for transmitting vehicle engine OBD data.
Background
At present, OBD data are generally transmitted by an ELM327 method, which sequentially searches several protocols commonly used in the current market, then globally broadcasts a request, and a vehicle replies which protocol is used for communication and transmission of OBD data by default according to ISO 15031-5.
The method CAN be normally used in most vehicles, but due to the updating of some vehicles, dozens of ECUs in the vehicle CAN use multiple protocols, for example, an engine ECU uses a CAN protocol, the rest ECUs use a K-wire protocol, and if the protocols are retrieved in a sequence of J1850- > K- > CAN, the data transmission protocol of the vehicle is identified as the K-wire protocol, so that the OBD data of the engine ECU cannot be requested to be transmitted.
Disclosure of Invention
The invention provides a transmission method of OBD data of a vehicle engine, aiming at solving the defect that the OBD data of the engine ECU can not be transmitted because different ECUs use different protocols in the prior art.
In order to realize the purpose, the technical scheme is as follows:
a transmission method of vehicle engine OBD data comprises the following steps:
s1, after a vehicle is started, a data application module initiates a data transmission request to a protocol identification control module;
s2, after receiving the data transmission request, the protocol identification control module starts a broadcast mode and searches protocols used by the ECU in the vehicle in sequence; then transmitting the searched protocol type to a protocol driving module; the protocol identification control module transmits the data transmission request to the protocol driving module;
s3, the protocol driving module packages the data transmission request according to the ith protocol searched by the protocol identification control module, and then transmits the packaged data to a signal conversion circuit, wherein the signal conversion circuit is used for converting the data into corresponding level signals; the initial value of i is 1;
s4, the level signal is transmitted to an ECU in the vehicle through the vehicle OBD port, and the ECU receives the level signal and then makes corresponding reply information to the vehicle OBD port;
s5, the signal conversion circuit transmits reply information to a protocol driving module after receiving the reply information, the protocol driving module performs data separation on the reply information and then transmits the separated data to a protocol identification control module, the protocol identification control module judges whether the reply information is sent by an engine ECU (electronic control Unit) according to the separated data, if so, the ECU is marked, a point-to-point physical addressing request mode is set to establish connection with the engine ECU, then engine OBD data are transmitted based on the established connection, and the protocol identification control module transmits the engine OBD data to a data application module after receiving the engine OBD data; if the reply message is not issued by the engine ECU, let i = i +1, and then step S3 is executed until the value of i is greater than the number of protocols searched by the protocol identification control module.
Preferably, the protocol type includes CAN protocol and K-wire protocol.
Preferably, the data application module, the protocol identification control module and the protocol driving module are integrated in the MCU.
Meanwhile, the invention also provides a system applying the method, and the specific scheme is as follows: the system comprises a data application module, a protocol identification control module, a protocol driving module, a signal conversion circuit, a vehicle OBD port and an ECU of a vehicle.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention filters the data which is not the engine by judging whether the reply information is sent by the engine ECU, and simultaneously can accurately identify the OBD bottom layer protocol used by the engine ECU through the protocol type of the packed data transmission request when the reply information is judged to be sent by the engine ECU, thereby obtaining the complete engine OBD data.
2) The invention adopts the broadcast request and the point-to-point request mode, firstly adopts the broadcast request mode to identify all the vehicle ECUs supporting the OBD function, and switches to the point-to-point mode after finding out the engine ECU, and only communicates with the engine ECU, and other non-engine ECUs do not need to send data response requests, thereby reducing the workload of the non-engine, simultaneously reducing the load of a vehicle bus, reducing the interference reminding of other systems, and reducing the filtering of data by a request end.
Drawings
Fig. 1 is a schematic diagram of the structure of the components involved in the method.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
the invention is further illustrated below with reference to the figures and examples.
Example 1
As shown in fig. 1, the method of the present invention involves the following components: the system comprises a data application module, a protocol identification control module, a protocol driving module, a signal conversion circuit, a vehicle OBD port and an ECU of the vehicle.
The data application module, the protocol identification control module and the protocol driving module are integrated in the MCU and form a bus module together with the signal conversion circuit.
On the basis of the above, the method provided by the invention comprises the following steps:
s1, after a vehicle is started, a data application module initiates a data transmission request to a protocol identification control module;
s2, after receiving the data transmission request, the protocol identification control module starts a broadcast mode and searches protocols used by the ECU in the vehicle in sequence; then transmitting the searched protocol type to a protocol driving module; the protocol identification control module transmits the data transmission request to the protocol driving module;
s3, the protocol driving module packages the data transmission request according to the ith protocol searched by the protocol identification control module, and then transmits the packaged data to a signal conversion circuit, wherein the signal conversion circuit is used for converting the data into corresponding level signals; the initial value of i is 1;
s4, the level signal is transmitted to an ECU in the vehicle through the vehicle OBD port, and the ECU receives the level signal and then makes corresponding reply information to the vehicle OBD port;
s5, the signal conversion circuit transmits the reply information to the protocol drive module after receiving the reply information, the protocol drive module performs data separation on the reply information, the separated data is transmitted to the protocol identification control module, the protocol identification control module judges whether the reply information is sent by the engine ECU according to the separated data, if yes, the ECU is marked, a point-to-point physical addressing request mode is set to establish connection with the engine ECU, then engine OBD data is transmitted based on the established connection, and the protocol identification control module transmits the engine OBD data to the data application module after receiving the engine OBD data; if the reply message is not issued by the engine ECU, let i = i +1, and then step S3 is executed until the value of i is greater than the number of protocols searched by the protocol identification control module.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (4)
1. A method for transmitting OBD data of a vehicle engine, applied to a vehicle having a plurality of ECUs using different protocols, comprising the steps of:
s1, after a vehicle is started, a data application module initiates a data transmission request to a protocol identification control module;
s2, after receiving the data transmission request, the protocol identification control module starts a broadcast mode and searches protocols used by the ECU in the vehicle in sequence; then transmitting the searched protocol type to a protocol driving module; the protocol identification control module transmits the data transmission request to the protocol driving module;
s3, the protocol driving module packages the data transmission request according to the ith protocol searched by the protocol identification control module, and then transmits the packaged data to a signal conversion circuit, wherein the signal conversion circuit is used for converting the data into corresponding level signals; the initial value of i is 1;
s4, the level signal is transmitted to an ECU in the vehicle through the vehicle OBD port, and the ECU receives the level signal and then makes corresponding reply information to the vehicle OBD port;
s5, the signal conversion circuit transmits reply information to the protocol driving module after receiving the reply information, the protocol driving module performs data separation on the reply information and then transmits the separated data to the protocol identification control module, the protocol identification control module judges whether the reply information is sent by the engine ECU according to the separated data, if so, the ECU is marked, a point-to-point physical addressing request mode is set to establish connection with the engine ECU, then, engine OBD data is transmitted based on the established connection, and other non-engine ECUs do not need to send data response requests; after receiving the engine OBD data, the protocol identification control module transmits the engine OBD data to the data application module; if the reply message is not sent by the engine ECU, i is made to i +1, and then step S3 is executed until the value of i is greater than the number of protocols searched by the protocol identification control module.
2. The method of transmitting vehicle engine OBD data according to claim 1, characterized in that: the protocol types comprise a CAN protocol and a K-line protocol.
3. The method of transmitting vehicle engine OBD data according to claim 1, characterized in that: the data application module, the protocol identification control module and the protocol driving module are integrated in the MCU.
4. A system according to any one of claims 1 to 3, wherein: the system comprises a data application module, a protocol identification control module, a protocol driving module, a signal conversion circuit, a vehicle OBD port and an ECU of a vehicle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711365495.8A CN107846419B (en) | 2017-12-18 | 2017-12-18 | Method and system for transmitting OBD data of vehicle engine |
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| CN201711365495.8A CN107846419B (en) | 2017-12-18 | 2017-12-18 | Method and system for transmitting OBD data of vehicle engine |
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| CN107846419B true CN107846419B (en) | 2020-11-24 |
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| CN110926481A (en) * | 2019-12-03 | 2020-03-27 | 华安鑫创控股（北京）股份有限公司 | Vehicle positioning navigation method and device thereof |
| CN112073500B (en) * | 2020-08-31 | 2022-02-25 | 安徽江淮汽车集团股份有限公司 | Vehicle controller upgrading method, device, storage medium and device |
| CN112799375B (en) * | 2020-12-25 | 2021-12-10 | 安徽工业大学 | Vehicle-mounted bus detection system and method |
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| CN103020865A (en) * | 2012-11-23 | 2013-04-03 | 深圳市元征科技股份有限公司 | Automotive engine individually-customized system and method |
| US9401923B2 (en) * | 2013-10-23 | 2016-07-26 | Christopher Valasek | Electronic system for detecting and preventing compromise of vehicle electrical and control systems |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102638562A (en) * | 2012-02-01 | 2012-08-15 | 浙江大学 | Vehicle-mounted terminal communication method applied to engineering machinery vehicle networking |
| CN203365143U (en) * | 2013-05-17 | 2013-12-25 | 绵阳新晨动力机械有限公司 | Hand-held vehicle failure diagnosis system |
| CN104020851A (en) * | 2014-06-17 | 2014-09-03 | 安徽猎豹汽车有限公司 | Input device and method for vehicle information codes |
| CN105604664A (en) * | 2015-12-23 | 2016-05-25 | 北京工业大学 | Vehicle emission remote monitoring system based on OBD (on-board diagnostics) detection data |
| CN105892356A (en) * | 2016-03-31 | 2016-08-24 | 大连楼兰科技股份有限公司 | OBD device identification method and system based on data request types |
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