液压挖掘机功率匹配节能控制方法及试验研究

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1、分类号UDCY997746《密级编号十．初大学CENTRALSOUTHUNIVERSTTY硕士学位论文论文题目液压挖掘机功率匹配节能控制立鎏区达坠盟塞学科、专业机械设计及理论研究生姓名常毅华导师姓名及专业技术职务何清华教授中南大学硕士学位论文ABSTRACTHydraulicexcavator,knownasakindofconstructionmachinewithhighpowerandhi曲energyconsumption，playsanimportantroleintheconstructionofthenationaleconomy．However,duetothes

2、everewasteofenergyresultedbyitshi曲energyconsumptionandlowenergyusage，itcallsforurgentlytheresearchonenergy—savingofhydraulicexcavator．Thisthesisfirstgivesageneraldescriptionofthestatus—quooftheresearchesbothhomeandabroadontheenergy—savingofhydraulicexcavator，andthenfocusesonreducingtheenergyl

3、ossbytheimproperpowermatchingaftertheanalysisofthemainenergylossesofhydraulicexcavator．Next，thethesisexploredtheworkingcharacteristicsoftheengine，advisestooperatetheenginebytheinductionofrotatespeedandalsodesignstheauto—idlingoftheengine．Intheworkingprocessofthehydraulicexcavator，theabsorbedp

4、owerofthehydraulicpumpissetoverthehighestoutputpoweroftheengineandthepowermarginoftheengineiscancelled，whichmakesitpossibletoexertthepotentialsoftheenginebetter．Thisthesisalsoputsforwardamethodnamed“P·Qcurvecorrespondcontrol”，namely,throughthecontrolofrotating—speedinduction，thepumpunderthewo

5、rkingconditionCanadjustthequantumtochangeP—Qcurveaccordingtotheload．ThisCanmaketheengineworksunderthebestworkingareaandsavethefuelconsumption．Atthesametime，confirmthedifferentpoweroutputmodeandworkingcondition，operatetheengineandpumpdifferentlyaccordingtOthedifferentrequirementsunderdifferent

6、workingconditions，andalsomakecontrolstrategies．Taketheengine，thehydraulicpumpandtheloadasadynamicwholetostudyanddesigntheenergy-savingcontrolsystemofthehydraulicexcavatorinordertOmakefulluseoftheoutputpoweroftheengine，improvetheworkingeffectandreducethefuelconsumption．Experimentisanotherstres

7、sinthisthesisandthreepurposesareattainedthroughalargenumberofexperiments：firstly,itprovesrespectivelythatthefluctuationofrotatingspeedofengineundertheII中南大学硕士学付论文ABSTRACTconditionoftheidlingandoverloadoftheenginehassomeeffectonthefuelconsumpt