基于离散小波变换的HCCI爆震特性参数研究
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摘要
在一台经改造的发动机上开展了不同进气温度下不同高辛烷值基础燃料(PRF)的均质压燃台架试验,利用离散小波变换方法从缸内压力中提取了爆震信号,定义了爆震强度(pKI),确定了爆震门槛值(pKIe)为0.2 MPa,当某个循环的pKI大于0.2 MPa时,定义为该循环发生爆震。对所研究的3种高辛烷值燃料,进气温度和辛烷值的变化对pKIe的值没有影响。对于轻微爆震的情况,利用提出的方法比使用最大压力升高率方法能更准确地判定爆震的出现,HCCI爆震燃烧存在着明显的边界,是一个突变过程。
Experiment on homogeneous charge compression ignition(HCCI) combustion with primary reference fuels(PRF) of different octane numbers at different intake air temperatures was carried out on a modified engine.In this paper,knock signal was extracted from in-cylinder pressure signal with discrete wavelet transfer(DWT) method and pKI value was defined as knock intensity.Knock intensity threshold(pKIe) was also determined.Knock occurring is regarded when pKI is larger than 0.2 MPa.pKIe is a constant under different intake air temperatures and different fuels in this experiment.The study showed that the defined knock intensity could give precise judgement for a light knock comparing to the method of maximum rise rate of in-cylinder pressure.The research demonstrates that HCCI knocking combustion is a drastic changing process and has a clear boundary.
Experiment on homogeneous charge compression ignition(HCCI) combustion with primary reference fuels(PRF) of different octane numbers at different intake air temperatures was carried out on a modified engine.In this paper,knock signal was extracted from in-cylinder pressure signal with discrete wavelet transfer(DWT) method and pKI value was defined as knock intensity.Knock intensity threshold(pKIe) was also determined.Knock occurring is regarded when pKI is larger than 0.2 MPa.pKIe is a constant under different intake air temperatures and different fuels in this experiment.The study showed that the defined knock intensity could give precise judgement for a light knock comparing to the method of maximum rise rate of in-cylinder pressure.The research demonstrates that HCCI knocking combustion is a drastic changing process and has a clear boundary.
引文
[1]郑尊清,尧命发,张波,等.均质压燃的燃烧循环变动试验[J].天津大学学报,2005,38(6):485—489.
[2]Su Wanhua,Lin Tijeian,Pei Yiqiang.A Compound Tech-nology for HCCI Combustion in a DI Diesel Engine Based onthe Multi-Pulse Injection and the BUMP Combustion Cham-ber[C].SAE Paper 2003-01-0741,2003.
[3]Fiveland Scott B,Rey Agama,Magnus Christensen,et al.Experimental and Simulated Results De Tailing the Sensitivi-ty of Natural Gas HCCI Engines to Fuel Comp-osition[C].SAE Paper 2001-01-3609,2001.
[4]Quader A A.Kirwan J E.Grieve M J.Engine Performanceand Emissions Near the Dilute Limit with Hydrogen Enrich-ment Using an on-Board Reforming Strategy[C].SAE Paper2003-01-1356,2003.
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[6]尧命发,郑尊清,沈捷,等.辛烷值对均质压燃发动机燃烧特性和性能的影响[J].燃烧科学与技术,2004,10(3):244—149.
[7]Burluka A A,Liu K,Sheppard C G W,et al.The Influenceof Simulated Residual and NO Concentrations on Knock On-set for PRFs and Gasolines[C].SAE Paper 2004-01-2998,2004.
[8]蒋德明.内燃机燃烧与排放学[M].西安:西安交通大学出版社,2001,395—397.
[9]Heywood J B.Internal Combustion Engine Fundamentals[M].New York:McGraw-Hill,1988,457—549.
[10]0livier Boubal.Knock Detection in Automobile Engines[J].IEEE Instrumentation&Measurement Magazine,2000,3(3):24—28.
[11]杨建国,张建峰,刘晓峰.基于时频分析的汽油机爆震特征的提取[J].内燃机工程,2003,24(3):33—37.
[12]郑治真,沈萍,杨选辉,等.小波变换及其MATLAB工具的应用[M].北京:地震出版社,2001,26—28.
[13]张宗平,刘贵忠,董恩清.基于二进小波变换的信号去噪[J].电子与信息学报,2001,23(11):1 083—1 090.
[14]王仲生,何红,陈钱.小波分析在发动机早期故障识别中的应用研究[J].西北工业大学学报,2006,24(1):68—71.
[15]Sung Tae Park,Jinguo Yang.Engine Knock Detection Basedon Wavelet Transform[C].The 8thRussian-Korean Inter-national Symposium,2004.
[16]杨福生,小波变换的工程分析与应用[M].北京:科学出版社,2000,42—48.
[17]Jonathan M Borg,Ka C Cheok,George Saikalis,et al.Wavelet-Based Knock Detection with Fuzzy Logic[A].CIMSA 2005-IEEE International Conference on Computa-tional Intelligence for Measurement Systems and Applica-tions,Giardini Naxos,Italy,20-22 July,2005.
[2]Su Wanhua,Lin Tijeian,Pei Yiqiang.A Compound Tech-nology for HCCI Combustion in a DI Diesel Engine Based onthe Multi-Pulse Injection and the BUMP Combustion Cham-ber[C].SAE Paper 2003-01-0741,2003.
[3]Fiveland Scott B,Rey Agama,Magnus Christensen,et al.Experimental and Simulated Results De Tailing the Sensitivi-ty of Natural Gas HCCI Engines to Fuel Comp-osition[C].SAE Paper 2001-01-3609,2001.
[4]Quader A A.Kirwan J E.Grieve M J.Engine Performanceand Emissions Near the Dilute Limit with Hydrogen Enrich-ment Using an on-Board Reforming Strategy[C].SAE Paper2003-01-1356,2003.
[5]刘金山,郭英男,谭满志,等.乙醇燃料均质压燃(HCCI)燃烧边界[J].燃烧科学与技术,2005,11(4):369—372.
[6]尧命发,郑尊清,沈捷,等.辛烷值对均质压燃发动机燃烧特性和性能的影响[J].燃烧科学与技术,2004,10(3):244—149.
[7]Burluka A A,Liu K,Sheppard C G W,et al.The Influenceof Simulated Residual and NO Concentrations on Knock On-set for PRFs and Gasolines[C].SAE Paper 2004-01-2998,2004.
[8]蒋德明.内燃机燃烧与排放学[M].西安:西安交通大学出版社,2001,395—397.
[9]Heywood J B.Internal Combustion Engine Fundamentals[M].New York:McGraw-Hill,1988,457—549.
[10]0livier Boubal.Knock Detection in Automobile Engines[J].IEEE Instrumentation&Measurement Magazine,2000,3(3):24—28.
[11]杨建国,张建峰,刘晓峰.基于时频分析的汽油机爆震特征的提取[J].内燃机工程,2003,24(3):33—37.
[12]郑治真,沈萍,杨选辉,等.小波变换及其MATLAB工具的应用[M].北京:地震出版社,2001,26—28.
[13]张宗平,刘贵忠,董恩清.基于二进小波变换的信号去噪[J].电子与信息学报,2001,23(11):1 083—1 090.
[14]王仲生,何红,陈钱.小波分析在发动机早期故障识别中的应用研究[J].西北工业大学学报,2006,24(1):68—71.
[15]Sung Tae Park,Jinguo Yang.Engine Knock Detection Basedon Wavelet Transform[C].The 8thRussian-Korean Inter-national Symposium,2004.
[16]杨福生,小波变换的工程分析与应用[M].北京:科学出版社,2000,42—48.
[17]Jonathan M Borg,Ka C Cheok,George Saikalis,et al.Wavelet-Based Knock Detection with Fuzzy Logic[A].CIMSA 2005-IEEE International Conference on Computa-tional Intelligence for Measurement Systems and Applica-tions,Giardini Naxos,Italy,20-22 July,2005.
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