Bus detection device and method
A detection device and bus technology, applied in the direction of electrical testing/monitoring, testing/monitoring control systems, instruments, etc., can solve problems such as power supply short circuit, OBD equipment failure, CAN bus failure, etc., to improve accuracy and ensure normal operation The effect of work
Active Publication Date: 2021-10-08
深圳移航通信技术有限公司
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[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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[0052] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present disclosure as recited in the appended claims.
[0053] Firstly, in the prior art, when the CAN bus on the OBD device to be detected is detected, only the data communication test is performed, and then based on the result of the data communication test, it is judged whether the CAN bus is working normally. However, in the prior art, for example, a high-speed CAN bus usually includes two signal wires, so when a fault such as a short c...
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The present application provides a bus detection device and method, which may include: a controller, an isolation circuit changeover switch, a level capture device, and an OBD connector; wherein, the controller is used to obtain a detection request, and the detection request includes the Detect the line identification; and according to the detection request, start the first isolation circuit switching switch corresponding to the line identification to be detected in the isolation circuit switching device to send the line test data request to the OBD device to be detected; the controller is also used to trigger the circuit A flat catcher, to obtain the first level information on the CAN bus corresponding to the first isolation circuit switching switch through the level catcher; the controller is also used to obtain the line test data response returned by the OBD device to be detected , judging whether the CAN bus works normally according to the first level information. The present application can realize accurate detection of the CAN bus, thereby ensuring that the OBD device to be detected can work normally.
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, such as an OBD diagnostic instrument and an OBD Internet of Things terminal device, is usually installed on the vehicle. The OBD device is usually deployed with a controller area network (Controller Area Network, CAN) bus, such as a high-speed CAN bus. 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 corres...
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IPC IPC(8): G05B23/02
CPCG05B23/0213
Inventor 唐传海
Owner 深圳移航通信技术有限公司