Multichannel redundant CAN (Controller Area Network) bus test system with frame start sensitive synchronous trigger function

Abstract

The invention discloses a multichannel redundant CAN (Controller Area Network) bus test system with a frame start sensitive synchronous trigger function. A CAN protocol card, a data acquisition card and a synchronous trigger module are connected between an upper computer and a dual redundant CAN network and between a lower computer and the dual redundant CAN network. The upper computer is used for receiving a message transmitted on the dual redundant CAN bus network and checking whether communication data of the message conforms to a predefined standard; the lower computer is used for receiving CAN_H and CAN_L level signals of the dual redundant CAN network, which are collected by the data acquisition card; the synchronous trigger module is used for completing synchronous acquisition of the CAN protocol card and the data acquisition card. Protocol testing, timing sequence analysis and waveform measurement are implemented in a double-computer working mode; data acquisition and test analysis of a dual redundant CAN bus are implemented in a standalone working mode.

Description

technical field [0001] The invention relates to a test system for CAN-bus field bus, more particularly, it refers to a multi-channel redundant CAN bus test system with frame start sensitive synchronous triggering function. The test system of the present invention respectively collects and processes information on the data link layer and the physical layer of the dual redundant CAN network, and then uses Ethernet to call and analyze the data information; it is a method capable of realizing CAN protocol testing, timing analysis and Processing system for waveform measurements. Background technique [0002] With the development of aerospace technology, the system integration is getting higher and higher, and the amount of data that needs to be exchanged between various systems and between various components within the system is also increasing. The serial bus is suitable for subsystems with long distances due to its simple interface. It is widely used in aerospace field for dat...

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Problems solved by technology

[0006] (3) Its higher cost also limits its popularization and application

None of the current test equipment can meet the needs of use very well. The test work is to sample from a large amount of received data, and then rely on manual tedious repetitive tests to complete, which not only wastes a lot of human resources and low test efficiency, but also It is impossible to achieve comprehensive coverage of all received data, and it is inevitable that there will be omissions

[0008] In the aerospace field, system performance testing is very strict, and real-time online monitoring of CAN-bus network status is necessary and frequent. From the description of the limitations of existing test systems, it can be seen that existing equipment cannot well meet real-time online testing. need

On the other hand, because the protocol data is obtained after the CAN controller and the CAN transceiver process the physical layer signal, only using the protocol layer data to determine whether the CAN network node is abnormal may be biased. An unavoidable problem is When there is a hardware failure at the physical layer, it is meaningless to judge by protocol layer data

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