基于均值模型的煤油发动机喷油控制策略
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摘要
采取一种基于平均值模型的喷油控制策略,根据容积法公式实时计算进气空气流量,建立进气流量估计器,同时采用油膜补偿控制策略,实现对稳态工况和瞬态工况的精确喷油控制。利用Matlab/Simulink工具,建立平均值模型和油膜补偿控制模型,仿真并与试验数据进行了对比。仿真结果表明,该控制策略可以实现对稳态工况和瞬态工况的精确空燃比控制,验证了该控制策略的有效性和实用性。
Due to inherent short-circuit loss of the inlet pre-mixed two-stroke engine, the actual air-fuel ratio feedback control cannot be performed by using the oxygen sensor. In addition, the inlet pressure under transient conditions cannot be measured truly, yielding error in air flow into the cylinder, because of inlet filling and emptying effect under transient conditions. This paper develops a mean value model based injection control strategy, where the intake air flow is calculated according to the volumetric method formula in real time, and an intake flow estimator adopting the film compensation control strategy is established to realize precise control of fuel injection under steady-state and transient conditions. A mean value model and the film compensation control simulation are performed with the Matlab/Simulink tool and compared with the experimental data. The results show that this control strategy can achieve precise control of the air-fuel ratio for transient and steady state conditions.
Due to inherent short-circuit loss of the inlet pre-mixed two-stroke engine, the actual air-fuel ratio feedback control cannot be performed by using the oxygen sensor. In addition, the inlet pressure under transient conditions cannot be measured truly, yielding error in air flow into the cylinder, because of inlet filling and emptying effect under transient conditions. This paper develops a mean value model based injection control strategy, where the intake air flow is calculated according to the volumetric method formula in real time, and an intake flow estimator adopting the film compensation control strategy is established to realize precise control of fuel injection under steady-state and transient conditions. A mean value model and the film compensation control simulation are performed with the Matlab/Simulink tool and compared with the experimental data. The results show that this control strategy can achieve precise control of the air-fuel ratio for transient and steady state conditions.
引文
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[11]陈林林.二冲程煤油发动机性能数值模拟与喷油控制研究[D].南京:南京航空航天大学,2010.CHEN Lin-lin.Research on numerical simulation of performance and fuel injection control for two-stroke kerosene engine[D].Nanjing:Nanjing University of Aeronautics and Astronautics,2010.
[12]LENZ U,SCHROEDER D.Transient air-fuel ratio control using artificial intelligence[C]//Society of Automotive Engineers Paper.Washington D C,USA:SAE,1997,970618.
[13]HORIE K,TAKAHASI H,AKAZAI S.Emission reduction during warm-up period by incorporating a wall-wetting fuel model on the fuel injection strategy during engine starting[C]//Society of Automotive Engineers Paper.Washington D C,USA:SAE,1995,952478.
[14]SHAYLER P J,Teo Y C,SCARISBRICK A.Fuel transport characteristics of spark ignition engines for transient fuel compensation[C]//Society of Automotive Engineers Paper.Washington D C,USA:SAE,1995,950067.
[15]NEYACHENKO I.Method of A/F Control during SI Engine Cold Start[C]//Society of Automotive Engineers Paper.Washington D C,USA:SAE,1998,981171.
[16]吴锋,胡金龙,邹博文.电喷汽油机进气管空气动态模型的仿真与试验研究[J].内燃机工程,2006,27(3):25-28.WU Feng,HU Jin-long,ZOU Bo-wen.Simulation and experimental study of EFI gasoline engine’s manifold filling dynamic model[J].Chinese Internal Combustion Engine Engineering,2006,27(3):25-28.
[17]卓斌,刘启华.车用汽油机燃料喷射与电子控制[M].北京:机械工业出版社,2001.ZHUO Bin,LIU Qi-hua.Fuel injection and electronic control of automotive gasoline engine[M].Beijing:Machine Press,2001.
[2]CATHCART G,DICKSON G,AHERN S.The application of air-assist direct injection for spark-ignited heavy fuel 2-stroke and 4-stroke engines[C]//Society of Automotive Engineers Paper.Washington D C,USA:SAE,2005.
[3]杨致明,李隆强.汽油机改烧煤油或柴油的研究[C]//中国内燃机学会特种发动机分会四届一次学术交流论文集.北京:中国内燃机学会,2006:42-50.YANG Zhi-ming,LI Long-qiang.Study on the gasoline engine to burn kerosene or diesel oil[C]//Set Special Engine Branch four a Seminar Paper.Beijing:Chinese Society for Internal Combustion Engines,2006:42-50.
[4]LEERSUM J,WILLIAMS L T.A numerical model of a high performance two-stroke engine[J].Applied Numerical Mathematics,1998,27(1):83-108.
[5]MERKER G P,GERSTLE M.Evaluation on two stroke engines scavenging models[C]//Society of Automotive Engineers Paper.Washington D C,USA:SAE,1997,970358.
[6]HENDRICKS E,SORENSON S C.Mean value modeling of spark ignition engines[C]//Society of Automotive Engineers Paper.Washington D C,USA:SAE,1990,900616.
[7]HENDRICKS E,CHEVALIER A,JENSEN M.Modeling of the intake manifold filling dynamics[C]//Society of Automotive Engineers Paper.Washington D C,USA:SAE,1996,960037.
[8]HENDRICKS E.Mean value modeling of large turbocharged two-stroke diesel engines[C]//Society of Automotive Engineers Paper.Washington D C,USA:SAE,1989,890564.
[9]陈林林,魏民祥.航空二冲程汽油发动机均值模型的试验与仿真[J].航空动力学报,2008,23(12):2249-2255.CHEN Lin-lin,WEI Min-xiang.Experiment and simulation of the mean value model on two-stroke gasoline aero-engine[J].Journal of Aerospace Power,2008,23(12):2249-2255.
[10]SHAYLER P J,TEO Y C,SCARISBRICK A.Fuel transport characteristics of spark ignition engines for transient fuel compensation[C]//Society of Automotive Engineers Paper.Washington D C,USA:SAE,1995,950067.
[11]陈林林.二冲程煤油发动机性能数值模拟与喷油控制研究[D].南京:南京航空航天大学,2010.CHEN Lin-lin.Research on numerical simulation of performance and fuel injection control for two-stroke kerosene engine[D].Nanjing:Nanjing University of Aeronautics and Astronautics,2010.
[12]LENZ U,SCHROEDER D.Transient air-fuel ratio control using artificial intelligence[C]//Society of Automotive Engineers Paper.Washington D C,USA:SAE,1997,970618.
[13]HORIE K,TAKAHASI H,AKAZAI S.Emission reduction during warm-up period by incorporating a wall-wetting fuel model on the fuel injection strategy during engine starting[C]//Society of Automotive Engineers Paper.Washington D C,USA:SAE,1995,952478.
[14]SHAYLER P J,Teo Y C,SCARISBRICK A.Fuel transport characteristics of spark ignition engines for transient fuel compensation[C]//Society of Automotive Engineers Paper.Washington D C,USA:SAE,1995,950067.
[15]NEYACHENKO I.Method of A/F Control during SI Engine Cold Start[C]//Society of Automotive Engineers Paper.Washington D C,USA:SAE,1998,981171.
[16]吴锋,胡金龙,邹博文.电喷汽油机进气管空气动态模型的仿真与试验研究[J].内燃机工程,2006,27(3):25-28.WU Feng,HU Jin-long,ZOU Bo-wen.Simulation and experimental study of EFI gasoline engine’s manifold filling dynamic model[J].Chinese Internal Combustion Engine Engineering,2006,27(3):25-28.
[17]卓斌,刘启华.车用汽油机燃料喷射与电子控制[M].北京:机械工业出版社,2001.ZHUO Bin,LIU Qi-hua.Fuel injection and electronic control of automotive gasoline engine[M].Beijing:Machine Press,2001.