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上海大众博世Motronic MED 7汽油直喷系统设计与功能英文自学手册

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heengineisinthecorrespondingengineloadandspeedranges-therearenoexhaustemissionfaultsinthesystem-thecoolanttemperatureisabove50°C-theNOxsensorisready,and-thetemperatureoftheNOxstoragecatalystisbetween250°Cand500°CIftheaboveconditionsaremet,theenginemanagementsystemcanchangeovertostratifiedchargemode.IntakeprocessInstratifiedchargemode,thethrottlevalveisopenedaswideaspossibleinordertominimisethrottlelosses.ThrottlevalveTheintakemanifoldflapclosesthelowerductinthecylinderhead.TheintakeairflowsatafasterIntakemanifoldrateandtumblesintothecylindersviatheupperflapduct.pletelyasacertainvacuummustalwaysbepresentduetotheactivatedcharcoalcanistersystemandexhaustgasrecirculation.AirflowInthecylinder,thetumblemotionoftheairisincreasedbythespecialshapeofthepistoncrown.TumbleairAirflowFlowrecess253_03810

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