Transcription of Modeling for Control of HCCI Engines - Stanford University
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Modeling for Control of HCCI Engines - Stanford University
Singlecylinderresearchengineusingvariabl evalve actuation(VVA)atStanfordUniver-sity. ,whichutilizeda temperaturethresholdtomodeltheonsetofthe combustionreaction, , , IntroductionExperimentalstudiesatStanfor dUniversity([1], [4])andelsewhere[6]demonstratethatvariab levalve actuation(VVA)canbeusedtoinitiatehomogen eouschargecom-pressionignition(HCCI).Thi sisachievedbyreinductingcombustionproduc tsfromthepreviouscycle, thermalsinkduringcombustion,thisprocessl owersthepeakcombustiontemperature, is importanttonotethatothermethodsexisttoin itiateHCCI,suchasheatingorprecompressing thein-take air([10],[7]) orvaryingthecompressionratio[2].Duetothe natureofHCCI,a sparkignition(SI)ordieselengines,whereth ecombustionis initiatedviasparkandfuelinjec-tion,respe ctively, ,ensuringthatcombustionoccurswithaccepta bletimingis ,whichdependsonin-cylinderspeciesconcent rations, synthesizea controllertostabilizeHCCI usingtheVVAsystem,a modelofthesystemwithspecialattentionpaid tocombustionphasingisthereforenecessary.
out of the cylinder through the exhaust valve, m˙2, po is the cylinder pressure, p, and pT is the exhaust manifold pres- sure, assumed to be atmospheric. For the reinducted ex-haust from the previous cycle through the exhaust valve, m˙3, po is the exhaust manifold pressure, and pT is the cylinder pressure,p.
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