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Vehicle diagnosis method and device

A technology of vehicle diagnosis and on-board diagnostic system, which is applied in the field of automobile fault diagnosis, can solve the problems of long time consumption, prolonging the time for establishing connection between vehicle diagnostic equipment and the vehicle, and low scanning efficiency, so as to reduce the number, shorten the connection time, The effect of improving connection efficiency

Inactive Publication Date: 2018-07-06
AUTEL INTELLIGENT TECHNOLOGY CORP LTD
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Problems solved by technology

[0004] However, it takes a long time to determine the communication protocol with the ECU by sequential scanning, and the scanning efficiency is low, which prolongs the time for the vehicle diagnostic equipment to establish a connection with the vehicle

Method used

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  • Vehicle diagnosis method and device
  • Vehicle diagnosis method and device

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Embodiment Construction

[0059]In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the following will describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the present invention Examples, not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0060] Below, some terms in this application are explained, so that those skilled in the art can understand:

[0061] 1) On-board diagnostic system (On-Board Diagnostic, OBD), type II on-board diagnostic system (On-Board Diagnostic II, OBD II), used to monitor whether the working status of each system in the vehicle is abnormal, if abnormal, determine the corresponding system...

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Abstract

The invention provides a vehicle diagnosis method and device. The method comprises steps that a level signal of a selected pin in a vehicle diagnosis system interface is collected to acquire voltage characteristics of the level signal; according to the voltage characteristics, candidate communication protocols associated with the selected pin are determined; a connection request signal based on the candidate communication protocols is sent to the selected pin to determine whether the candidate communication protocols contain a target communication protocol; if yes, communication between an automobile diagnostic device and an electronic control unit ECU of the vehicle is established based on the target communication protocol. The method is advantaged in that the scanning protocol quantity of OBD interface pins is reduced, scanning efficiency is improved, and the vehicle diagnosis time is shortened.

Description

technical field [0001] The invention relates to the technical field of automobile fault diagnosis, in particular to a vehicle diagnosis method and device. Background technique [0002] At present, most cars are equipped with on-board diagnostic system (On-Board Diagnostic, OBD). OBD is mainly used to diagnose the state of the vehicle according to the operating status of the engine and the working status of the exhaust gas after-treatment system. It has strong versatility. , The advantages of convenient diagnosis. [0003] There is an OBD interface on the car. Wherein, each pin in the OBD interface is correspondingly connected with each electronic control unit (Electronic Control Unit, ECU) in the vehicle based on different vehicle communication protocols. The vehicle diagnostic equipment can establish a connection with the ECU in the vehicle through the OBD interface. In the process of establishing a connection with the ECU through the OBD interface, the vehicle diagnosti...

Claims

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Application Information

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IPC IPC(8): G05B23/02
CPCG05B23/0213
Inventor 罗青华瞿松松
Owner AUTEL INTELLIGENT TECHNOLOGY CORP LTD
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