fundamental test results of a hydraulic free piston

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1、1149FundamentaltestresultsofahydraulicfreepistoninternalcombustionengineAHibiandTIto*DepartmentofMechanicalEngineering,ToyohashiUniversityofTechnology,Toyohashi,JapanAbstract:Thehydraulicfreepistoninternalcombustionenginepumpthathasbeenconstructedandtestedinthisworkist

2、heopposedpiston,two-strokecycle,uniflowscavenging,directfuelinjection,andcompressionignitiontype.Theopposedenginepistonsreciprocatethehydraulicpumppistonsdirectlyandthehydraulicpowertobeusedinthehydraulicmotorsisgenerated.Thehydraulicpressuregeneratedissubstantiallycons

3、tant.Theopposedfreepistonsrestaftereverygascycleandhydraulicpoweriscontinuouslysuppliedbyahydraulicaccumulatorduringthefreepistons’rest.Thesmallerthehydraulicflowoutput,thelongerthedurationoftherest.Everygascycleisperformedunderafixedworkingconditionindependentofhydrauli

4、cpoweroutput.Thetestresultsinthisworkindicatethatthenumberofgascyclespersecondofthefreepistonenginepumpisdirectlypro-portionaltohydraulicflowoutput.Theopposedfreepistonsoperateevery53.2swhenhydraulicflowoutputis1.02cm3/s;atthattimehydraulicpoweroutputis0.0124kW.Hydraulic

5、thermalefficiency,theratioofhydraulicenergyproducedtofuelenergyconsumed,hasbeenmeasuredintherange0.0124kWto4.88kWofhydraulicpoweroutputandithasbecomeclearthathydraulicthermalefficiencyinthisrangeisconstant.Themeasuredvalueofhydraulicthermalefficiencyis31percent.Ithasbeendemo

6、nstratedthathydraulicthermalefficiencyiskeptconstantevenifhydraulicpoweroutputisverysmall.Keywords:internalcombustionengine,freepistonengine,opposedpiston,hydraulicpower,constantpressuresystem,fuelsaving,idlingstopNOTATION1INTRODUCTIONCcomputersignaltocontrolon–offvalve15

7、inThethermalefficiencyofacrankpistonengineisvery1Fig.3lowwhenthepoweroutputisverysmall,thoughitisCcomputersignalforthefuelinjectiongoodintheoptimumworkingcondition.Inaddition,a2fnumberofcyclespersecondconsiderableamountoffuelisconsumedwhilekeepingppressureinhydrauliccham

8、ber13inFig.3theengineidling.Insuchapplicationsasapassengercpgaspressureinenginecylinder2inFig.3car,automotivecrane,au