495电喷汽油机进气过程仿真及试验研究

【作者】 郑俊丽；

【导师】 吴锋；

【作者基本信息】 浙江大学 ， 动力机械及工程， 2005， 硕士

【摘要】 随着我国汽车产量和保有量的不断攀升,以及越来越严重的能源危机和不容忽略的环境污染问题,对汽车提出更高的节能和环保的要求。为了节约能源和满足排放要求,目前使用的汽油发动机大都采用了电控喷射方式,以提高空燃比的控制精度,但是要满足更高的节能和环保的要求还需要对汽油发动机的空燃比进行更精确的控制,基于模型的空燃比控制是目前国内外研究的热点问题。精确计量汽油机的进气空气流量是实现这种控制方法的前提。本课题的主要任务就是对汽油发动机的进气过程进行研究。 本文对目前汽车机进气过程的研究现状进行了综述,确定了研究方案。建立了汽油机进气歧管状态一维均和二维均值模型,然后在MATLAB/Simulink环境中对所建立的模型实现了仿真计算,比较了一维和二维模型的精度。 本文还建立了汽油机的非均值模型,其中涉及到的模型有汽油机的进气过程模型,燃烧模型、燃油喷射模型及其燃油蒸发模型等等。然后在RICARDO WAVE仿真环境以及在RICARDO WAVE与MATLAB/Simulink的联合仿真环境中对其进行了仿真,得到了需要的发动机性能参数结果曲线。 最后,在WF4C27F—E型电喷汽油机(495汽油机)上进行了试验,将试验结果和前面得到的模型仿真结果进行了对比分析,以所建立的模型进行了验证。更多还原

【Abstract】 With the increasing quantity of the auto in China and running short of petroleum and with the tightening of exhaust emission standards, it is necessary to more accurately control A/F in a stoichiometric proportion. Though modern autos are assembled EFI system, the precision of A/F controlling is still not enough. It still need to improve the precision of A/F. In order to improve the precision of A/F, it need to well and truly measure the flux of the air. The purpose of this paper is researching the intake process of the gasoline engine.A mean value model had been founded in the paper and then the author revised the model. The two kind of models were simulated in MATLAB/Simulink and then the results of models had been compared. The author also set up the thermodynamics and fluid dynamics models for the gasoline engine and then these models were simulated in RICARDO WAVE.In order to validate the validity of the model set up by author, a set of experiment has been done in gasoline engine. The experiment result show the model has good validity in many operation conditions.更多还原