汽油机论文：单缸四冲程汽油机怠速工况转速控制策略研究.doc

索购全文在线加好友：278.121.888（同时提供论文辅导写作和学术期刊论文发表服务）汽油机论文：单缸四冲程汽油机怠速工况转速控制策略研究【中文摘要】随着汽车保有量的增加，城市交通拥堵状况随之加剧。据统计，汽车发动机大约有30%的燃油消耗在怠速工况下，同时有1/3的排放量来自怠速工况。怠速转速低，HC、CO等污染物的排放明显增多，转速高则燃油消耗量大。因此，研究怠速工况下电喷发动机稳定运转的控制策略尤为重要。本文主要研究内容如下：(1)以CB125发动机为研究对象，结合平均值模型理论，以发动机电喷系统标定试验数据为基础，建立了基于Matlab/Simulink的基本喷油脉宽仿真模型、燃油蒸发与动态油膜模型、发动机动力输出模型，将三个模型封装得到发动机整机模型，得出了发动机基本喷油脉谱、喷油脉宽响应曲线和转速响应曲线，验证了模型的正确性。(2)分别探讨了目前在怠速控制系统中得到广泛应用的传统PID控制、参数随被控系统工况变化而变化的变参数PID控制以及对时变性、非线性、不确定性系统有很好适应性的模糊PID控制，并对三种控制系统进行了阶跃响应仿真对比，结果表明模糊PID控制相对于其他两种控制系统具有抗干扰能力强，鲁棒性好等特点。(3)对怠速工况的控制策略进行了总体设计，在平均值模型上进行仿真同时在本田CB125发动机上进行试验。结果表明，模糊PID控制系统较其他两种控制系统更适合于本课题开发的发动机电喷系统。【英文摘要】Withtheincreaseofcarownership,urbantrafficcongestionisgettingmoreandmoreintensive.Accordingtostatistics,about30%oftheautomobileenginefuelisconsumedintheidlecondition,while1/3oftheexhaustemissionsfromidlecondition.Atthelow-speedidlecondition,theHC、COandotherpollutantemissionisincreasingsignificantly,butfuelconsumptionisincreasingatthehigh-speedcondition.Therefore,controlstrategyisparticularlyimportanttokeeptheenginespeedstableatidlecondition,aswellastoalleviatetheincreasingseriousenvironmentalpollutionandenergydepletion.Inthispaper,HondaCB-125engineistakenasthesubjectbasedonthetestdatausingthemean-valuemethod.ThemodelofengineatidlespeedinMatlab/Simulinkisconstructedtoconfirmthetargetparametersoftheenginecalibration.Pulsegraphsofengineinjectionandrotatespeedresponsecurvesareobtainedandthevalidityofthemodelindifferentsituationsisproved.WidelyusedtraditionalPIDcontrolsystem,Variable-argumentsPIDcontrolsystemcontrolandflexiblefuzzy-PIDgoodatthenonlinear,time-varying,uncertaintiesconditionsinidlespeedarestudied.Stepresponsesofthesethreecontrolsystemsaresimulatedandcompared.Itshowsthatfuzzy-PIDisbetterinstronganti-interferenceandrobustnessthantheothertwosystems.Theoverallengineidlespeedcontrolstrategyisdesigned,andidlespeedstabilityofthreesystemsaresimulatedandcomparedusingthemean-valuemodleintheofHondaCB-125engine.Theresultsshowthatthefuzzy-PIDcontrolsystemismoresu