Automobile bus communication line selection device and diagnosis equipment

Abstract

An embodiment of the invention discloses an automobile bus communication line selection device, which comprises a communication interface unit, a protocol comprehensive switch array, a protocol configuration switch array and a control unit, wherein the control unit obtains a plurality of different communication protocol signals through the communication interface unit; the protocol comprehensive switch array decomposes and synthesizes a plurality of different communication protocol signals, gathers the communication protocol signals to a group of communication lines, and then is defined by theprotocol configuration switch array according to pins of automobile OBD diagnosis bases of different automobile types. The required communication protocol signals are configured to the pins corresponding to the automobile OBD diagnosis bases through a set of communication lines, the purpose of diagnosing various different electric control systems through a single interface is achieved, the line selection logic is simplified to the greatest extent, the protocol comprehensive switch array and the protocol configuration switch array are controlled through the control unit, and the reliability ofline selection is improved, the line selection logic is simple and clear, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of automobile diagnostic equipment, in particular to an automobile bus communication line selection device and diagnostic equipment. Background technique [0002] The vehicle diagnostic mode and diagnostic socket have been gradually standardized, making it possible to realize fault diagnosis for different electronic control systems of multiple vehicle series in a single interface form. At present, the existing comprehensive diagnostic equipment for passenger cars on the market usually uses communication analog switches to select lines, and the logic part of line selection uses CPLD. [0003] At present, the comprehensive diagnostic equipment is aimed at 12V passenger cars, and the general communication line selection part uses analog switches, while the fault diagnosis of heavy trucks needs to add the J1708 protocol, and it needs to be compatible with the 24V system. Since the devices in the comprehensive d...

AI Technical Summary

Problems solved by technology

Therefore, in order to realize the fault diagnosis of different electronic control systems of multiple vehicles in the form of a single interface, each communication line of the comprehensive diagnostic equipment uses a relay, which has a large number of relays, takes up a large space, and the selection of communication lines is complicated. And compatible with 24V system and adding J1708 protocol greatly increase the cost of comprehensive diagnostic equipment

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