涡轮增压天然气发动机电控系统进气模型研究
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摘要
针对天然气发动机普遍采用的进气充量标定方法精度和可移植性不高的问题,以一台潍柴WP10NG336涡轮增压火花点燃单点喷射全电控天然气发动机为研究对象,研究了基于物理模型的适合天然气发动机的进气充量模型。在平均值模型的假设基础上,采用折合气体流量描述进气过程,将进气过程流经缸内的气体细分为回流废气、扫气废气、倒流废气、始终驻留废气和新鲜折合气体,对涡轮增压器、节气门、进气管、排气管和气缸进行综合建模,并通过进气惯性对充量的影响来对模型进行简单修正。为验证模型的精确性,开展了针对WP10NG336天然气发动机的台架试验。试验结果表明,本文所提出的进气模型误差范围在4%以内,在占用较少计算资源的情况下能够准确地估计各种工作条件下发动机的实际稳态进气充量。
Aiming at the problem of poor accuracy and portability of normal intake charge calibrating method used in natural gas engine and taking a Weicai WP10 NG336 turbocharged single-point injection natural gas engine as the research object,an intake charge model suitable for natural gas engine was studied.Based on the mean model,the equivalent gas flow was used to describe the intake process.The gas flowing through the cylinders was divided into reversing flow exhaust gas,scavenging exhaust gas,backflow residual gas,consistently stayed residual gas and fresh equivalent gas.Synthetic modeling and analyses were conducted on the turbocharger,throttle valve,intake manifold,exhaust manifold and cylinders,and the model was verified in consideration of the influence of intake inertia.Experiments on the WP10 NG336 turbocharged natural gas engine were conducted,and results showed that the error range of the intake model proposed in this paper is within 4% and the air charge model is able to accurately estimate the actual air charge under different working conditions while occupying little computing resources.
Aiming at the problem of poor accuracy and portability of normal intake charge calibrating method used in natural gas engine and taking a Weicai WP10 NG336 turbocharged single-point injection natural gas engine as the research object,an intake charge model suitable for natural gas engine was studied.Based on the mean model,the equivalent gas flow was used to describe the intake process.The gas flowing through the cylinders was divided into reversing flow exhaust gas,scavenging exhaust gas,backflow residual gas,consistently stayed residual gas and fresh equivalent gas.Synthetic modeling and analyses were conducted on the turbocharger,throttle valve,intake manifold,exhaust manifold and cylinders,and the model was verified in consideration of the influence of intake inertia.Experiments on the WP10 NG336 turbocharged natural gas engine were conducted,and results showed that the error range of the intake model proposed in this paper is within 4% and the air charge model is able to accurately estimate the actual air charge under different working conditions while occupying little computing resources.
引文
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[2] HUTTER R,DE LIBERO L,ELBERT P,et al.Catalytic methane oxidation in the exhaust gas aftertreatment of a lean-burn natural gas engine[J].Chemical Engineering Journal,2018,349:156-158.
[3] YANG Bo,WEI Xing,XI Chengxun,et al.Experimental study of the effects of natural gas injection timing on the combustion performance and emissions of a turbocharged common rail dual-fuel engine[J].Energy Conversion and Management,2014,87(11):297-304.
[4] YANG Bo,ZENG Ke.Effects of natural gas injection timing and split pilot fuel injection strategy on the combustion performance and emissions in a dual-fuel engine fueled with diesel and natural gas[J].Energy Conversion and Management,2018,168(7):162-169.
[5]陈昊,韩斌,陈轶嵩,等.天然气汽车发展现状及趋势[J].中国能源,2018,40(2):36-41.CHEN Hao,HAN Bin,CHEN Tiesong,et al.Current situation and development trend of natural gas automobiles[J].Energy of China,2018,40(2):36-41.
[6]王帅兵,秦豪杰,邵方阁.国内天然气汽车的发展现状及趋势[J].汽车实用技术,2016(10):1-3.WANG Shuaibing,QIN Haojie,SHAO Fangge.Development status and trends of domestic natural gas vehicles[J]. Automobile Applied Technology,2016(10):1-3.
[7]杨健.基于Matlab/Simulink的天然气发动机电控系统仿真[J].小型内燃机与车辆技术,2008,37(6):62-64.YANG Jian.Simulation of electronically controlled system for CNG engine based on Matlab/Simulink[J].Small Internal Combustion Engine and Motorcycle,2008,37(6):62-64.
[8] LIVSHIZ M,KAO M,WILL A.Validation and calibration process of powertrain model for engine torque control development[C/OL]∥SAE 2004 World Congress&Exhibition.[2018-04-15].DOI:10.4271/2004-01-0902.
[9]邹博文,李静波,陈本林,等.基于状态观测器的天然气发动机控制策略研究[J].汽车技术,2008(11):5-8.ZOU Bowen,LI Jingbo,CHEN Benlin,et al.Research of natural gas engine control strategy based on state observer[J]. Automobile Technology,2008(11):5-8.
[10]黄雪峰,谢辉,陈韬,等.用于汽油机瞬态空燃比前馈控制的进气量预测模型[C]∥中国内燃机学会燃烧节能净化分会2014年学术年会暨先进发动机节能及测试技术论坛.北京:中国内燃机学会:2014:965-970.
[11]洪木南,欧阳明高.基于汽油机平均值模型的在线转矩估计[J].机械工程学报,2009,45(4):290-294.HONG Munan,OUYANG Minggao.On-board torque estimation based on mean value SI engine models[J].Journal of Mechanical Engineering,2009,45(4):290-294.
[12]刘巨江,林思聪,吴坚,等.基于进气歧管压力的进气模型研究[J].车用发动机,2011(3):29-31.LIU Jujiang,LIN Sicong,WU Jian,et al.Charge model based on intake manifold pressure[J].Vehicle Engine,2011(3):29-31.
[13]王建昕.汽车发动机原理[M].北京:清华大学出版社,2011:89-90.
[14]HEYWOOD J.Internal combustion engine fundamentals[M].New York,USA:McGraw-Hill Education,1988:205-270.
[15]陆家祥.柴油机涡轮增压技术[M].北京:机械工业出版社,2004:92-101.