Bus detection device and method

Abstract

The invention provides a bus detection device and method. The bus detection device comprises a controller, an isolation circuit change-over switching device, a level capturer and an OBD connector; thecontroller is used for acquiring a detection request, wherein the detection request comprises a to-be-detected line identifier; according to the detection request, a first isolation circuit change-over switch, corresponding to the to-be-detected line identifier, in the isolation circuit change-over switching device, is started so as to send a line test data request to a to-be-detected OBD device;the controller is also used for triggering the level capturer so as to acquire first level information on a CAN bus corresponding to the first isolation circuit change-over switch through the level capturer; and the controller is further used for judging whether the CAN bus works normally or not according to the first level information when a line test data response returned by the to-be-detectedOBD device is obtained. With the device of the invention adopted, the accurate detection of the CAN bus can be realized, and the normal work of the to-be-detected OBD device can be guaranteed.

Description

technical field [0001] The present application relates to the field of bus technology, in particular to a bus detection device and method. Background technique [0002] With the continuous development of society, vehicles have become the main means of transportation for users to travel. On-Board Diagnostics (OBD for short) equipment is usually installed on the vehicle, for example, an OBD diagnostic instrument and an OBD Internet of Things terminal device. A Controller Area Network (CAN) bus, such as a high-speed CAN bus, is usually deployed on the OBD device. At present, it is necessary to perform fault detection on the CAN bus on the OBD device to determine whether the CAN bus is working normally. [0003] In the prior art, a data communication test is used to detect whether the CAN bus on the OBD device to be tested works normally. Specifically, send a test data request to the OBD device to be detected through the CANH and CANL signal lines corresponding to the CAN bus...

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Problems solved by technology

[0004] However, in the prior art, when there is a fault in one of the CANH and CANL signal lines, for example, CANH is short-circuited to the power supply of the OBD device to be detected, or when CANL is short-circuited to ground, the signal line that is not faulty is also passed. The test data request can be sent to the OBD device to be detected, and the response returned by the OBD device to be detected is received, that is, according to the prior art, it is normal to determine that the CAN bus is working at this time, but the actual situation is not If the CAN bus is faulty, if the OBD device to be tested is used for a long time, it may cause a more serious failure of the OBD device to be detected, thus reducing the service life of the OBD device

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