A Common Rail Injector Sensitive Fault Feature Extraction Method Based on Composite Hierarchical Discrete Entropy Chde and Pairwise Proximity Pwfp

A common rail injector and fault feature technology, which is applied in the direction of machines/engines, mechanical equipment, engine components, etc., can solve the problems of difficult and low extraction accuracy of common rail injector fault features, and achieve good fault diagnosis results Effect

Active Publication Date: 2022-06-21
HARBIN ENG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a common rail injector sensitive fault feature extraction method based on CHDE and PWFP, which solves the problem that common rail injector fault features are difficult to extract or the extraction accuracy is not high under complex working conditions.

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  • A Common Rail Injector Sensitive Fault Feature Extraction Method Based on Composite Hierarchical Discrete Entropy Chde and Pairwise Proximity Pwfp
  • A Common Rail Injector Sensitive Fault Feature Extraction Method Based on Composite Hierarchical Discrete Entropy Chde and Pairwise Proximity Pwfp
  • A Common Rail Injector Sensitive Fault Feature Extraction Method Based on Composite Hierarchical Discrete Entropy Chde and Pairwise Proximity Pwfp

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[0040] The present invention will be described in more detail below in conjunction with the accompanying drawings:

[0041] combine Figure 1-5 , a common rail injector sensitive fault feature extraction method based on CHDE and PWFP, including the following steps:

[0042] S1. Use a high-precision pressure sensor to collect the fuel pressure fluctuation signal of the high-pressure fuel pipe, and divide the collected signal into a training signal and a test signal;

[0043] S2. Calculate the composite hierarchical discrete entropy of the training signal and the test signal respectively;

[0044] S3. Calculate the proximity between discrete entropies at each level, and score with the proximity as a reference. The scores are arranged in ascending order. The lower the score, the more sensitive the fault feature is;

[0045] S4. Select the top-ranked composite hierarchical discrete entropy in the training sample to form a subset of feature vectors, and input the binary tree supp...

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Abstract

The purpose of the present invention is to provide a method for extracting sensitive fault features of common rail fuel injectors based on CHDE and PWFP. Firstly, high-precision pressure sensors are used to collect high-pressure oil pipe pressure signals; then the composite level discrete entropy of fuel pressure signals is calculated; The proximity between the levels of discrete entropy is scored according to the proximity, and the scores are arranged in ascending order. The lower the score, the more sensitive the level of discrete entropy is to the fault feature; finally, the test sample is input into the trained binary tree support vector machine multi-classifier for Fault diagnosis and pattern recognition, and output fault diagnosis results. The invention is suitable for extracting sensitive fault features of the common rail fuel injector under complicated working conditions, and has good fault diagnosis effect.

Description

technical field [0001] The invention relates to a method for extracting faults of a diesel engine, in particular to a method for extracting faults of a common rail injector of a diesel engine. Background technique [0002] Electronically controlled high pressure common rail fuel injection technology, as the third leap in diesel engine technology after high pressure injection technology and supercharging technology, has become a hot spot in the competition of marine diesel engine technology around the world. Due to the increasingly complex function and structure of the common rail fuel system and the harsh working environment, the reliability of the common rail diesel engine fuel system has become the focus of research on the electronically controlled fuel system. According to a survey by the Marine Management Research Association of the Japan Shipowners Association, the failure rate of injectors accounts for 17.1% of the failures of the main engine. The failure of injectors ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02B77/08
CPCF02B77/08
Inventor 宋恩哲柯赟姚崇
Owner HARBIN ENG UNIV
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