A diesel engine valve wear fault identification method based on vibration signal

By obtaining the vibration signal of the diesel engine cylinder head and performing signal processing, the phase changes of the valve seating impact are identified, and the problem of inaccurate identification of valve wear faults is solved, and efficient and accurate fault identification and monitoring is achieved.

CN115060502BActive Publication Date: 2025-03-25CHINA NORTH ENGINE INST TIANJIN
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Patent Information

Application Number
CN202210654828.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-06-10
Publication Date
2025-03-25
Estimated Expiration
2042-06-10

AI Technical Summary

Technical Problem

The prior art is difficult to accurately and timely identify diesel engine valve wear faults, resulting in failure to deal with the faults in time, which may cause serious safety hazards.

Method used

By continuously obtaining the cylinder head vibration signal of a certain cylinder of a diesel engine, we judge whether the vibration impact energy has an increasing trend, and accurately extract the phase of the valve seating impact through signal processing, and conducting state judgment to identify valve wear faults.

Benefits of technology

It realizes accurate identification of diesel engine valve wear faults, simple processing methods, clear identification mechanism, good timeliness and high accuracy, and is suitable for real-time status monitoring and fault diagnosis in actual engineering fields.

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Abstract

The present invention provides a method for identifying valve wear faults of diesel engines based on vibration signals, comprising the following steps: continuously acquiring the cylinder head vibration signal of the diesel engine cylinder; judging whether the vibration impact energy shows an increasing trend under the same working conditions according to the cylinder head vibration signal, if there is no increasing trend, it is considered that the diesel engine cylinder has no valve wear fault; if there is an increasing trend, further judgment is required; effectively identifying the valve seat impact through signal processing, extracting the phase of the intake and exhaust valve seat impact; performing state judgment on the phase result of the extracted valve seat impact, if the phase is ahead of the design phase of the intake and exhaust valve closing, it is judged that the diesel engine cylinder has a valve wear fault, otherwise, continuously collecting and monitoring the cylinder head vibration signal. The diesel engine valve wear fault identification method based on vibration signals of the present invention can more effectively identify the diesel engine valve wear fault; it also has strong applicability in the actual engineering field.
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