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Composite fault diagnosis method for diesel engine and diagnosis system

A technology of composite faults and diagnostic methods, applied in the direction of internal combustion engine testing, etc., can solve problems such as long detection cycle, unsatisfactory fault detection accuracy, and single detection means

Inactive Publication Date: 2014-02-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the detection methods of these technologies are relatively simple, and they do not deal with vibration and noise and do not reflect the degree of wear of friction pairs. The detection cycle is long and the accuracy of fault detection is not ideal.

Method used

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  • Composite fault diagnosis method for diesel engine and diagnosis system
  • Composite fault diagnosis method for diesel engine and diagnosis system
  • Composite fault diagnosis method for diesel engine and diagnosis system

Examples

Experimental program
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Embodiment

[0038] Depend on figure 1 As shown, the diesel engine test platform used for the diesel engine compound fault diagnosis method includes water tank 1, pressure sensor 2, water eddy current dynamometer 3, coupling 4, dynamometer system 5, gearbox 6, diesel engine 7, and bench 8 , fuel tank 9, fuel consumption meter 10, vibration acceleration sensor 11, data acquisition card 12, vibration analyzer 13, computer 14, exhaust gas analyzer 15, spectrum analyzer 16; the shaft connection gearbox 6 output by the diesel engine 7, the gearbox 6 passes through The coupling 4 is connected with the water eddy current dynamometer 3, and the water eddy current dynamometer 3 transmits the load to the diesel engine 7;

[0039] Described diesel engine 7 connects data acquisition card 12, vibration analyzer 13, computer 14 by vibration acceleration sensor 11; ; The fuel consumption meter 10 is respectively connected with the fuel tank 9, the dynamometer system 5, and the diesel engine 7;

[0040]...

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Abstract

The invention discloses a composite fault diagnosis method for a diesel engine and a diagnosis system. The fault of a fuel supply system of the diesel engine can be diagnosed based on comprehensive analysis of fuel flow monitoring, exhaust emissions, temperature detection and the like in the state parameter measuring method. In vibration analysis, vibrating signals are measured by a vibration acceleration sensor, noise is removed via empirical mode decomposition (EMD), and then characteristic parameters of the vibration signal acceleration are extracted in a manifold learning method. For failure of a piston cylinder, vibration analysis and fuel analysis are combined, and the degrees of friction and wear are judged according to the vibration amplitude and the content of Fe. The composite fault diagnosis of the diesel engine can be realized based on integration of the fault characteristic information and comparison with typical failure characteristics. The diesel engine fault diagnosis system is developed on the basis of integration of information of multiple characteristics, all characteristic information is fully utilized, the speed and accuracy of diagnosis can be improved, the advantages can be complemented, and the level of diesel engine fault diagnosis can be improved.

Description

technical field [0001] The invention relates to the technical field of diesel engine fault diagnosis, in particular to a diesel engine compound fault diagnosis method and a diagnosis system. Background technique [0002] At present, the commonly used methods for diesel engine fault diagnosis include speed measurement, vibration analysis and oil analysis. The speed measurement method is to measure the speed of the diesel engine by installing a sensor on the connecting parts of the diesel engine to measure the speed of the diesel engine. The speed is a reflection of a state during the operation of the diesel engine. [0003] Vibration analysis is to collect, record and analyze the time-frequency domain signal changes of the vibration components in the diesel engine through the application of various dynamic testing instruments. Vibration signal processing mainly includes time-domain analysis, frequency-domain analysis and time-frequency domain analysis. Oil analysis technol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M15/05
Inventor 谢小鹏肖海兵冯伟葛爽
Owner SOUTH CHINA UNIV OF TECH
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