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Self-diagnosis method for vehicle diagnosis apparatus protocols by vehicle diagnosis apparatus

A vehicle diagnostic instrument and self-diagnosis technology, applied in the field of vehicle diagnosis, can solve the problem that OBD has no self-check function

Active Publication Date: 2014-11-19
BEIJING YESWAY INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the 1980s, major automobile manufacturers in the United States, Japan, and Europe have begun to equip their EFI vehicles with OBD. The initial OBD did not have a self-test function.

Method used

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  • Self-diagnosis method for vehicle diagnosis apparatus protocols by vehicle diagnosis apparatus
  • Self-diagnosis method for vehicle diagnosis apparatus protocols by vehicle diagnosis apparatus
  • Self-diagnosis method for vehicle diagnosis apparatus protocols by vehicle diagnosis apparatus

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Embodiment Construction

[0074] The above and other technical features and advantages of the present invention will be described in more detail below in conjunction with the accompanying drawings.

[0075] see figure 1 As shown, it is a functional block diagram of a vehicle diagnostic instrument-to-vehicle diagnostic instrument protocol self-diagnosis method of the present invention, which includes a vehicle connection interface 1 and a vehicle diagnostic instrument 2 . The vehicle diagnostic instrument 2 includes a control module 21 , a communication protocol switching module 22 , a storage module 23 and a self-diagnosis module 24 .

[0076] The control module 21 includes an instruction receiving subunit 211 and a control subunit 212; the instruction receiving subunit 211 is used to receive instructions sent by the service platform, and then control the vehicle. When the communication protocol cannot be connected, a request can be sent to the service platform, requesting manual operation, formatting...

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PUM

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Abstract

The invention relates to a self-diagnosis method for vehicle diagnosis apparatus protocols by a vehicle diagnosis apparatus. The method comprises the following steps: initializing the vehicle diagnosis apparatus after the vehicle diagnosis apparatus is powered on and scanning a vehicle wholly; judging whether data matched with the vehicle exists in the vehicle diagnosis apparatus or not; establishing communication with the vehicle through recorded data or default values; determining whether a self-diagnosis module is started or not according to the communication protocol switching module returned value and the first data transmission after the connection of the communication protocol by the self-diagnosis module; according to the self-diagnosis results, judging establishment of communication with the vehicle, self diagnosis again or formatting of the diagnosis apparatus. According to the method provided by the invention, optimum matching can be performed on the communication protocols of the diagnosis apparatus, the protocol matching value can be calculated through a bit error rate and the response time, therefore, the optimum matching protocol can be judged; error codes appearing in the communication can be detected and flow control can be performed on slow response time, so that error codes and slow response time caused by frequent data transmission are avoided.

Description

technical field [0001] The invention relates to a vehicle diagnostic method, in particular to a self-diagnosis method of a vehicle diagnostic instrument to a vehicle diagnostic instrument protocol. Background technique [0002] OBD is the abbreviation of On-Board Diagnostic in English, and the Chinese translation is "On-Board Diagnostic System". This system monitors the operating status of the engine and the working status of the exhaust gas after-treatment system at any time, and will immediately issue a warning if any situation that may cause excessive emissions is found. When the system fails, the fault (MIL) light or check engine (Check Engine) warning light is on, and the OBD system will store the fault information in the memory, and the relevant information can be read in the form of fault codes through standard diagnostic instruments and diagnostic interfaces . According to the prompt of the fault code, the maintenance personnel can quickly and accurately determine ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B23/02
Inventor 蒋毅成王克崔光辉
Owner BEIJING YESWAY INFORMATION TECH
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