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Acta Armamentarii ›› 2022, Vol. 43 ›› Issue (5): 992-1001.doi: 10.12382/bgxb.2021.0155

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Fault Diagnosis Method of High-pressure Common Rail System Based on EEMD-SVM

LI Liangyu1, SU Tiexiong1, MA Fukang2, WU Xiaojun3, XU Chunlong3   

  1. (1.College of Mechatronic Engineering,North University of China,Taiyuan 030051,Shanxi,China;2.School of Energy and Power Engineering,North University of China,Taiyuan 030051,Shanxi,China;3.China North Engine Research Institute,Tianjin 300400,China)
  • Online:2022-04-12

Abstract: When the high-pressure common rail system for diesel engine is running, the rail pressure fluctuation signal fluctuates greatly and has obvious nonlinear characteristics, which makes the fault diagnosis more difficult. For the problem that the state parameters of rail pressure signal in high-pressure common rail system are difficult to extract and identify, a fault diagnosis method based on ensemble empirical mode decomposition (EEMD)-support vector machine (SVM) is proposed. The rail pressure signal is decomposed into a series of eigenmode functions by EEMD, and the eigenvalues in the eigenmode functions are extracted using the feature extraction criterion determined by the zero-crossing rate curve. The extracted eigenvalues are input into SVM for fault type diagnosis. The rail pressure signal is obtained through AMESim software simulation experiment, and seven different eigenvalue selection methods are compared. Finally, the energy eigenvalue is selected to construct the eigenvalue vector for identification, and the diagnosis results are analyzed to verify the correctness and accuracy of the proposed method. The results show that the proposed EEMD-SVM-based fault diagnosis method for high-pressure common rail system can be used to identify six different operating states, with the average fault diagnostic accuracy rate of 96.11%.

Key words: high-pressurecommonrailsystem, faultdiagnosis, ensembleempiricalmodedecomposition, supportvectormachine

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