• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2015, Vol. 51 ›› Issue (2): 148-154.doi: 10.3901/JME.2015.02.148

• 可再生能源与工程热物理 • 上一篇    下一篇

基于集合经验模式分解的汽油机爆震特征提取

李 宁1杨建国2周 瑞3   

  1. 1.上海第二工业大学智能制造与控制工程学院 上海 201209;
    2.哈尔滨工业大学汽车工程学院 威海 264209;
    3.中国舰船研究设计中心 上海 201108
  • 出版日期:2015-01-20 发布日期:2015-01-20
  • 基金资助:
    国家自然科学基金(51305250)、上海市教委创新(14YZ153)、上海第二工业大学机械制造及其自动化培育学科(XXKPY1305)资助项目

Gasoline Engine Knock Feature Extraction Based on Ensemble Empirical Mode Decomposition

LI Ning1YANG Jianguo2ZHOU Rui3   

  1. School of Intelligent Manufacturing and Control Engineering, Shanghai Second Polytechnic University, Shanghai 201209;School of Automobile Engineering, Harbin Institute of Technology, Weihai 264209;China Ship Development and Design Center, Shanghai 201108
  • Online:2015-01-20 Published:2015-01-20

摘要: 爆震特征提取是汽油机点火闭环控制的前提和基础。基于集合经验模式分解(Ensemble empirical mode decomposition, EEMD),提出一种汽油机爆震特征提取方法。EEMD通过对信号加入有限幅度的高斯白噪声,利用高斯白噪声频率均匀分布的统计特性使信号在不同尺度上保持连续性,有效地抑制经验模式分解(Empirical mode decomposition, EMD)的模式混叠问题。研究了利用EEMD和EMD两种方法分别从汽油机缸内压力信号和缸盖振动信号中提取爆震特征的可行性和有效性。试验结果表明,对于缸内压力信号,EEMD和EMD均能提取出爆震特征;对于缸盖振动信号,EEMD可以提取出爆震特征,而EMD则由于模式混叠的影响,无法提取爆震特征。

关键词: 爆震, 经验模式分解, 汽油机, 特征提取

Abstract: Knock feature extraction is the key of closed loop control of ignition in gasoline engine. Based on the ensemble empirical mode decomposition (EEMD), a gasoline engine knock feature extraction method is presented. By adding some finite amplitude Gaussian white noises to the signal, EEMD keeps the signal continuous in different time span, and therefore the mode mixing inhering in the classical empirical mode decomposition (EMD) method is alleviated. The effectiveness of applying EEMD and EMD to extract knock feature from a pressure signal measured from combustion chamber and a vibration signal measured from cylinder head are investigated. The experimental results demonstrate that the knock feature can be effectively extracted from both pressure and vibration signals by EEMD. On the other hand, owing to the interference in different modes, the knock signature can only be extracted from the pressure signal by EMD.

Key words: empirical mode decomposition, feature extraction, gasoline engine, knock

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