Automobile OBD communication pin intelligent identification method and device

Abstract

The invention belongs to the technical field of automobile fault detection, and particularly relates to a method for establishing data communication between a fault detector and an automobile ECU. According to the method, all communication protocols are loaded from a database via the fault detector to transmit data to first group of pins in an OBD connector one by one under the premise that the fault detector and an automobile ECU communication wire are connected. If data connection can be established between the pins and the detector, the pins are communication pins of a system selected by the current detector, or the detector automatically switches to the next group of communication pins of the OBD connector to transmit the data to the OBD connector one by one again so that the communication points are finally locked via repetition of the aforementioned process through continuous cycling and continuous scanning. The complicated operation process and the necessity of changing the connector continuously are reduced for maintenance technical personnel. Meanwhile, working efficiency is enhanced so that rapid, accurate and economical effects are brought to clients.

Description

Technical field [0001] The technical scheme of the invention relates to a detection device for communicating with an automobile OBD interface, which can automatically identify the automobile OBD communication pin and protocol type. Background technique [0002] Currently known automobile OBD is the abbreviation of on-board automatic diagnosis system, the definition of its diagnostic interface terminal is #2, #10 pin is J1850 protocol, #6 pin is J15765 protocol, #7, #15 pin is ISO14230 or ISO9141 protocol, others The pins are reserved for manufacturers to define; the technology of OBD car tester to detect cars is to connect the matching connection device in advance by technicians, and after selecting the absolute path in the tester, the tester can communicate with the car OBD interface . However, after completing all the above steps, the detector may not be able to establish communication with the car OBD interface. In the stage of establishing a communication link with the...

AI Technical Summary

Problems solved by technology

In the stage of establishing a communication link with the OBD interface of the car, the general tester only uses one communication protocol to try to link with one pin on the OBD interface, so that the failure rate of establishing the link is very high, and when the establishment of the link fails, the on-site The operator has to re-test and confirm the effective communication pin of the OBD interface, and feed back to the tester R&D engineer to finally confirm the cause of the failure, which increases the work of the operator and makes the work more complicated.

Images