A method and system for fault diagnosis of clutch engaging process based on sdg model

Abstract

The invention provides a method and system for diagnosing faults in a clutch engaging process based on an SDG model. According to the method, a clutch is diagnosed through the SDG model, the SDG model of the clutch is built on the basis of analyzing a transmission system and an automatic operating system and building a mathematical model, all variables influencing the work of the clutch are fully considered, certain nodes are simplified according to actual conditions and needs, the symbols of the nodes are judged through data detected by a sensor so as to determine a compatible path, on the basis of the principle of probability, branch paths are ranked according to the probability that faults occur, the reason node of the branch path with the largest fault occurrence possibility is troubleshot firstly, the node is possibly a fault source, other branch paths are detected according to the sequence if the node is not the fault source, and therefore diagnosis efficiency is greatly improved.

Description

technical field [0001] The invention relates to the basic field of fault diagnosis of clutch engagement process based on SDG model, in particular to a method and system for fault diagnosis of AMT heavy-duty off-road vehicle clutch engagement process based on SDG model. Background technique [0002] AMT (Automatic Mechanical Transmission) is an automatic mechanical transmission based on a dry clutch and a mechanical transmission. The control of the clutch is the core key of the AMT. Whether the clutch and its operating mechanism can work normally will directly affect the realization of basic functions such as starting and shifting operation of the vehicle, and then affect the power, economy and ride comfort of the vehicle. For AMT heavy-duty off-road vehicles, dry clutches are mostly used, and the operating mechanism mostly adopts the air-assisted hydraulic control form. Due to the harsh working environment of heavy-duty off-road vehicles and the many links in series in the ...

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to solve the problem of poor globality and low diagnostic efficiency in the fault diagnosis of the clutch engagement process of AMT heavy-duty off-road vehicles. A method and system for fault diagnosis of the clutch engagement process of AMT heavy-duty off-road vehicles based on the SDG model are provided in the embodiment. Through the dynamic analysis and mathematical modeling of the clutch engagement process, the SDG model of the clutch engagement process is established. Through the actual measurement and the analysis of the nodes and directed edges in the model, the fault source is found and the fault diagnosis function is completed.

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