电磁阀控制脉宽对发动机可变气门系统压力波动的影响
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摘要
液压油压力波动现象直接影响电-液式可变气门系统气门附加升程的启-闭特性,进而间接影响缸内气体状态参数。基于自主研发的DK4A柴油机电-液式可变气门系统工作过程,建立了压力波动系统化评价参数,并通过该评价参数,分析了电磁阀的控制脉宽(8～20)ms对柴油机可变气门系统压力波动的影响规律。试验研究结果表明:波峰峰值压力P_2随控制脉宽的增加而增加,而峰值相位α_5后移;控制脉宽≥12ms时,液压腔内液压油在波动区间β_5内出现了压力波动维持阶段,且控制脉宽越大,波动维持阶段越长,波动率及波动方差均出现了先增加后减少的趋势;区间β_6的压差及压力突变率和β_7的波动率及波动方差均呈现出先增大后减小的变化规律;区间β_8波动始点压力值逐渐降低,始点相位α_8及波动消失点相位α_9逐渐滞后。
Hydraulic oil pressure fluctuation can directly affect the electric-hydraulic type variable valve system additional lift start-up and shutting down system characteristics,thus,indirectly affect the status data of the in-cylinder gas. It is based on the working process of the DK4 A diesel electric-hydraulic type variable timing system which was produced independently,established an evaluation parameters of the pressure fluctuation. Through the evaluation parameters,analysed the influence of the control pulse width(8～20)ms to the diesel variable valve pressure system. The results of the research shows that:the pressure peaks of P_2 were increased with the increasing of the control pulse width,and the peak phase of α_5 was shift;When the control pulse width ≥12 ms,the hydraulic oil in the hydraulic chamber appears a pressure fluctuations maintenance phase in the range of fluctuation range β_5,and the greater of the control pulse width,the fluctuation of the maintenance phase longer,the volatility and variance are both increased and then decreased;The different pressure and pressure mutation rates of β_6 and the volatility and variance of β_7 both increased first before the decreased;The pressure value of volatility starting point gradually decreases in β_8,the starting phase of α_8 and the fluctuation vanishing phase of α_9 gradually lagging.
Hydraulic oil pressure fluctuation can directly affect the electric-hydraulic type variable valve system additional lift start-up and shutting down system characteristics,thus,indirectly affect the status data of the in-cylinder gas. It is based on the working process of the DK4 A diesel electric-hydraulic type variable timing system which was produced independently,established an evaluation parameters of the pressure fluctuation. Through the evaluation parameters,analysed the influence of the control pulse width(8～20)ms to the diesel variable valve pressure system. The results of the research shows that:the pressure peaks of P_2 were increased with the increasing of the control pulse width,and the peak phase of α_5 was shift;When the control pulse width ≥12 ms,the hydraulic oil in the hydraulic chamber appears a pressure fluctuations maintenance phase in the range of fluctuation range β_5,and the greater of the control pulse width,the fluctuation of the maintenance phase longer,the volatility and variance are both increased and then decreased;The different pressure and pressure mutation rates of β_6 and the volatility and variance of β_7 both increased first before the decreased;The pressure value of volatility starting point gradually decreases in β_8,the starting phase of α_8 and the fluctuation vanishing phase of α_9 gradually lagging.
引文
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[10]李洋.柴油机可变气门系统开发及试验研究[D].天津:天津大学,2008.(Li Yang.Development and experimental study of diesel engine variablevalve actuation system[D].Tianjin:Tianjin University,2008.)
[11]战强,韩志强,吴松林.两模式进气门晚关系统对于柴油机燃烧特性影响研究[J].内燃机学报,2013,31(1):1-8.(Zhan Qiang,Han Zhi-qiang,Wu Song-lin.Effects of Two-Mode LateIntake Valve Closing System on Diesel Engine Combustion and Emiss-ions[J].Transactions of CSICE,2013,31(1):1-8.)
[12]战强,苏万华.滑阀-液压式进气门晚关机构的设计和研究[C].中国内燃机学会燃烧节能净化分会,2010.(Zhan Qiang,Su Wan-hua.Design and Study of a Hydraulic-Slide ValveLate Intake Valve Closing Actuation[C].The Combustion Energy-savingPurifying Branch of China Internal Combustion Engine Association,Academic Annual Conference,2010.)
[13]韩志强,战强,吴松林.进气门晚关机构与增压系统在柴油机中等负荷的优化匹配研究[J].农业机械学报,2013,44(3):17-23.(Han Zhi-qiang,Zhan Qiang,Wu Song-lin.Optimization Match betweenIVCA and Turbocharged System at Middle Load in Diesel Engines[J].Transactions of the Chinese Society of Agricultural Machinery,2013,44(3):17-23.)
[14]韩志强,樊利康.进气门晚关机构对高增压柴油机排放与热效率的影响[J].车用发动机,2015(1):69-76.(Han Zhi-qiang,Fan Li-kang.Influence of IVCA on Emission and The-rmal Efficiency for Highly Boosting Diesel Engine[J].Vehicle Engine,2015(1):69-76.)
[2]Weall A,Szybist J P,Edwards K D.HCCI load expansion opportunitiesusing a fully variable HVA research engine to guide development of a pr-oduction intent cam-based VVA engine:the low load limit[C].SAE2012-01-1134,2011.
[3]Lang O,Salber W,Hahn J.Thermodynamical and mechanical approachtowards a variable valve train for the controlled auto ignition combustionprocess[C].SAE Paper 2005-01-0762,2005.
[4]Postrioti L,Foschini L,Battistoni M.Experimental and numerical studyof an electro-hydraulic camless VVA system[C].SAE Paper 2008-01-1356,2008.
[5]Don Law,Dan Kemp,Jeff Allen.Controlled Combustion in an ICE with afully Variable Valve Train[C].SAE Paper,2001-01-0251.
[6]Nebojsa Milovanovic,Rui Chen,Jamie Turner. Influence of the VariableValve Timing Strategy on the Control of a Homogeneous Charge Compr-ession Ignition(HCCI)Engine[C]. SAE Paper 2004-01-1899.
[7]刘发发,王云开,李华.电控液压可变气门机构性能及应用[J].内燃机学报,2011(1):54-60.(Liu Fa-fa,Wang Yun-kai,Li Hua.Performances of Electro-HydraulicValve Train and Application[J].Transactions of CSICE,2011(1):54-60.)
[8]谢宗法,王岩,王志明.全可变液压气门机构的气门运动特性[J].内燃机学报,2011(2):169-174.(Xie Zong-fa,Wang Yan,Wang Zhi-ming.Valve Movement Characte-ristics Using Fully Variable Hydraulic Valve Train[J].Transactions ofCSICE,2011(2):169-174.)
[9]曾东建,樊利康,韩伟强.电控液压可变气门系统控制参数对气门运动规律的影响[J].内燃机工程,2015(12):1-7.(Zeng Dong-jian,Fan Li-kang,Han Wei-qiang.The effect of controlparameters of electro-hydraulic variable valve drive system on the valvemovement charateristics[J].Combustion Engine Engineering,2015(12):1-7.)
[10]李洋.柴油机可变气门系统开发及试验研究[D].天津:天津大学,2008.(Li Yang.Development and experimental study of diesel engine variablevalve actuation system[D].Tianjin:Tianjin University,2008.)
[11]战强,韩志强,吴松林.两模式进气门晚关系统对于柴油机燃烧特性影响研究[J].内燃机学报,2013,31(1):1-8.(Zhan Qiang,Han Zhi-qiang,Wu Song-lin.Effects of Two-Mode LateIntake Valve Closing System on Diesel Engine Combustion and Emiss-ions[J].Transactions of CSICE,2013,31(1):1-8.)
[12]战强,苏万华.滑阀-液压式进气门晚关机构的设计和研究[C].中国内燃机学会燃烧节能净化分会,2010.(Zhan Qiang,Su Wan-hua.Design and Study of a Hydraulic-Slide ValveLate Intake Valve Closing Actuation[C].The Combustion Energy-savingPurifying Branch of China Internal Combustion Engine Association,Academic Annual Conference,2010.)
[13]韩志强,战强,吴松林.进气门晚关机构与增压系统在柴油机中等负荷的优化匹配研究[J].农业机械学报,2013,44(3):17-23.(Han Zhi-qiang,Zhan Qiang,Wu Song-lin.Optimization Match betweenIVCA and Turbocharged System at Middle Load in Diesel Engines[J].Transactions of the Chinese Society of Agricultural Machinery,2013,44(3):17-23.)
[14]韩志强,樊利康.进气门晚关机构对高增压柴油机排放与热效率的影响[J].车用发动机,2015(1):69-76.(Han Zhi-qiang,Fan Li-kang.Influence of IVCA on Emission and The-rmal Efficiency for Highly Boosting Diesel Engine[J].Vehicle Engine,2015(1):69-76.)