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Bus_Off fault testing system and testing method

A technology of fault test and test method, applied in transmission system, digital transmission system, data exchange through path configuration, etc., can solve problems such as affecting the normal operation of other nodes, Bus_Off failure, etc., achieving low test environment requirements and simple circuit construction , the effect of high test accuracy

Pending Publication Date: 2018-04-24
SAIC-GM-WULING AUTOMOBILE CO LTD
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Problems solved by technology

[0004] In order to solve the problem that the Bus_Off fault of a certain node of the CAN bus in the prior art affects the normal operation of other nodes, the present invention provides a Bus_Off fault test system, and also provides a test method based on the Bus_Off fault test system for Bus_Off faults are tested

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  • Bus_Off fault testing system and testing method
  • Bus_Off fault testing system and testing method
  • Bus_Off fault testing system and testing method

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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0025] In the present invention, Bus_Off is a state of the CAN communication module. After a transmission error occurs in the CAN communication module, when the transmission error counter is greater than 255, it enters the Bus_Off state and stops sending and receiving CAN messages. After the set Bus_Off recovery time, CAN communication The module restarts sending and receiving CAN messages.

[0026] Such as figure 1 As shown, the Bus_Off fault test system of the present invention includes a power switch S, more than one CAN node, a CAN bus message monitoring device (CAN case for short), a CAN bus jammer, a signal reflection prevention module and an upper computer, wherein the power switch is connected to The output end of the DC power supply 12V is used to supply power to the CAN node. The CAN node, the CAN bus message monitoring device, and ...

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Abstract

The invention provides a Bus-Off fault testing system and testing method and belongs to the field of CAN bus fault detection. The testing system includes a power switch, more than 1 CAN nodes, a CAN bus message monitoring device, a CAN bus interferometer, a signal reflection prevention module and an upper computer, wherein the power switch is connected with the output terminal of a power source; the CAN node, the CAN bus message monitoring device and the CAN bus interferometer are connected to a twisted-pair in parallel. The upper computer includes an upper computer CANoe connected with the CAN bus message monitoring device and an upper computer CANStress connected with the CAN bus interferometer. The signal reflection prevention module includes two signal reflection prevention units having identical structures and arranged on two sides of the twisted-pair respectively. The system provided by the invention is simple in circuit construction, high in stability and can test a series of problems caused by Bus-Off faults effectively.

Description

technical field [0001] The invention relates to the field of CAN bus fault testing, in particular to a Bus_Off fault testing system, and also to a testing method based on the Bus_Off fault testing system. Background technique [0002] In recent years, the domestic automotive electronics industry has developed rapidly. CAN (Controller Area Network, Controller Area Network) bus technology has become the mainstream method of data transmission between automotive electronic control units, and its research and development process, quality and safety issues of subsequent use have received extensive attention. [0003] CAN bus Bus_Off is an important part of the quality evaluation of the car CAN bus single node and the whole vehicle bus, which directly or indirectly affects the realization of the functions of the car electronic and electrical modules. Therefore, developing a stable and reliable Bus_Off fault testing method has become an urgent problem to be solved. Contents of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/26H04L12/24H04L12/40
CPCH04L12/40006H04L41/0677H04L43/06H04L43/50H04L2012/40215
Inventor 覃华强彭杨匡小军王俏力陈兴渝
Owner SAIC-GM-WULING AUTOMOBILE CO LTD
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