李鸿,黄英,赵振峰,岳芸鹏,王绪.2 冲程直喷煤油发动机空燃比控制方法[J].航空发动机,2021,47(S1):85-92
2 冲程直喷煤油发动机空燃比控制方法
Air-fuel Ratio Control Method for Two Stroke Direct Injection Kerosene Engine
  
DOI:
中文关键词:  直喷煤油发动机  2冲程  空燃比控制  平均值模型  扫气模型
英文关键词:direct injection kerosene engine  two stroke  air-fuel ratio control  mean value model  scavenging model
基金项目:深圳市科技创新基金(JCYJ20170817114345260)资助
作者单位E-mail
李鸿,黄英,赵振峰,岳芸鹏,王绪 北京理工大学机械与车辆学院北京100081 lihong7452@163.com 
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中文摘要:
      为了保障2冲程直喷煤油发动机高效、稳定地运行,对其空燃比控制方法进行了研究。采用机理建模和试验数据建模 相结合的方法,建立了2冲程直喷煤油发动机平均值模型,包括扫气模型和燃油油量模型。在扫气模型建模过程中,分别对进气 道、曲轴箱、气缸进行了分析;燃油油量模型考虑了气缸温度对燃油蒸发效果的影响,并引入了燃油蒸发系数。对2冲程发动机扫 气过程进行了分析,通过台架试验得到了不同工况下的扫气效率、扫气比和捕获率等扫气参数。基于Matlab/Simulink建立了空燃 比前馈控制器,并进行了台架试验验证。结果表明:控制器能够满足空燃比的控制要求,最大误差为10%左右,该误差产生的原因 为燃油油量模型和扫气模型存在系统误差,但是燃油油量模型的系统误差影响较小,可以忽略。
英文摘要:
      In order to ensure the efficient and stable operation of the two stroke direct injection kerosene engine,the air-fuel ratio control method was studied. The mean value model of two stroke direct injection kerosene engine was established by combining mechanism modeling with test data modeling,including scavenging model and fuel model. The air inlet,crankcase and cylinder were analyzed respec? tively in the process of modeling the scavenging model. The fuel model took into account the influence of cylinder temperature on fuel evap? oration and introduced fuel evaporation coefficient. The scavenging process of two stroke engine was analyzed,and the scavenging parame? ters such as scavenging efficiency,scavenging ratio and trapping efficiency under different working conditions were obtained by bench test. Based on the Matlab/Simulink,the model-based air-fuel ratio controller was established and verified by bench test. The results showed that the controller can meet the control requirements of the air-fuel ratio,and the maximum error is about 10 %. The reason for this error is that there are systematic errors in the fuel model and the scavenging model,but the systematic error of the fuel model has little effect and can be ignored.
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