CAN communication data monitoring method and system based on OBD interface

A CAN communication and data monitoring technology, which is applied in the field of CAN communication data monitoring based on OBD interface, can solve problems such as limited OBD port resources, inability to meet demand, and weak data confidentiality, and achieve the effect of ensuring security

Active Publication Date: 2016-03-09
ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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Problems solved by technology

[0005] However, the existing standard OBD port has limited resources, generally only 16 pins, and can be connected to 4 CAN buses at most, so it can only obtain CAN communication information of 4 subnets at most. As the number of CAN network segments of the vehicle increases, such as figure 2 The system shown cannot meet the requirements; and if the vehicle subnet is directly connected to the OBD port, any diagnostic equipment can access the vehicle communication information, and the data confidentiality is not strong.

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  • CAN communication data monitoring method and system based on OBD interface
  • CAN communication data monitoring method and system based on OBD interface
  • CAN communication data monitoring method and system based on OBD interface

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Embodiment Construction

[0040] In order to enable those skilled in the art to further understand the features and technical contents of the present invention, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings and implementation methods.

[0041] In view of the limited resources of the current online diagnostic interface - ODB-II port, the data confidentiality of the CAN subnet directly connected to the ODB-II port is not strong, the embodiment of the present invention provides a CAN communication data monitoring method and system based on the OBD interface , through the configuration of the gateway controller, the gateway controller will forward the communication messages of each CAN subnet to the ODB-II port, so as to realize the monitoring of the CAN communication status of the whole vehicle.

[0042] Such as image 3 It is the first flow chart of the CAN communication data monitoring method based on the OBD interface in the emb...

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Abstract

The invention relates to a CAN communication data monitoring method and system, in particular to a CAN communication data monitoring method and system based on an OBD interface. The method includes the steps that a diagnosis device sends a diagnosis request instruction to a gateway controller through the OBD-II interface; the gateway controller detects whether the format of the diagnosis request instruction is correct or not after receiving the diagnosis request instruction; if yes, the gateway controller sends a positive response message to the diagnosis device according to the diagnosis request instruction so that the diagnosis device can monitor CAN communication data of a CAN subnet; if not, the gateway controller sends a negative response message to the diagnosis device. By means of the method and the system, foundation is provided for vehicle failure checking and analyzing.

Description

technical field [0001] The invention relates to a CAN communication data monitoring method and system, in particular to a CAN communication data monitoring method and system based on an OBD interface. Background technique [0002] With the rapid development of automotive electronic products, the increase in vehicle electrical functions has led to a large increase in vehicle controllers, and the application of gateway technology has made the vehicle CAN bus topology more complex, such as figure 1 It is a schematic diagram of a CAN bus topology structure with a gateway structure in the prior art, figure 1 Among them, the gateway controller is externally connected to five CAN subnets CAN1 to CAN5, and each subnet has different CAN nodes, for example, CAN node 1, CAN node 2...CAN node 10 shown in the figure, the gateway controller passes The diagnosis CAN bus is connected with the online diagnosis interface OBD-II. [0003] Since the diagnostic CAN is connected to the OBD port...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B23/02
CPCG05B23/0213G05B2219/25032
Inventor 周红英张明星周华强
Owner ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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