presntasi VVT-I by sprata

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									            VVTi
(Variable Valve Timing Intelligent)




      DAIHATSU MOTOR CO.,LTD.
     OVERSEAS SERVICE DIVISION
                                      1
  ADVANTAGE
                             Engine : K3-VE



                      Improved
Engine Performance
  (Torque)
                     About     10 %

                      Improved
Fuel Economy
                     About       6%

                      Decreased
NOx
                     About       40 %
                                              2
                               VVTi SYSTEM
                                       Engine : K3-VE, EJ-VE


 Valve Timing
                                                CONTENTS
             TDC
  IN open
                  2°EX close                   VALVE TIMING
       30           12°
                           Engine
       °                   rotating            VVTi CONSTRUCTION
                           direction

                                               VVTi CONTROL



52°
IN close
            10°       30°EX open

             BDC                                                    3
VALVE TIMING
SAAT IDLING


      Mengurangi overlap           TDC




    Gas buang yang balik ke
          intake port
        akan tidak ada        EX




       Pembakaran stabil                     IN




    Menambah hemat bahan
           bakar                   BDC


                                         4
SAAT BEBAN RINGAN DAN SEDANG




             Menambah overlap




      Internal EGR        Mengurangi
    rate bertambah       pumping loss




      Mengurangi
     emisi Nox dan         Menambah
       membakar           hemat bahan
      kembali HC             bakar

                                        5
SAAT BEBAN BERAT KECEPATAN RENDAH DAN SEDANG




          Saat menutup intake valve
                   maju




       Gas buang yang balik ke intake
            port akan tidak ada




        Memperbaiki volumetric
        efficiency


              Menambah out put

                                               6
SAAT BEBAN BERAT KECEPATAN
TINGGI




        Saat menutup intake valve
         mundur sesuai dengan
            kecepatan mesin.



       Saat penutupan valve sesuai
        dengan gaya inersia aliran
            udara yang masuk



      Improved volumetric efficiency


             Improved output



                                       7
         RANGKUMAN
                                      Kerja mesin          Valve timing
                              Range                  TMA           TMB


                                1     Idling                     IN
                                                    EX

                                                             IN
                                2     Beban
                                      ringan        EX

                    Range 5
                                                            IN
Beban




                                3     Beban
                                      sedang        EX
                Range 3
                                      RPM
                                      sedang                IN
                                4
                                      &             EX
        Range     Range 2             Beban berat
          1
                                      RPM tinggi              IN
                  RPM Mesin     5        &
                                                    EX
                                      Beban berat
                                                                          8
                 DVVT/VVTi CONTROL




                   Engine ECU

                                        Throttle sensor
OCV              Target valve timing    Pressure sensor


      Feedback
                     Compensation       Water temp. sensor
       control


                                        Crank angle sensor
                  Actual valve timing   Cam angle sensor




                                                     9
             KONSTRUKSI VVTi



                               Cam
  OCV                          angle
                               sensor



VVTi
controller




   Crank
   angle
   sensor




                                        10
      KONTROL VVTi

                           Lock pin
Tekanan
Hydraulic                          Tekanan
                                    pegas

     Saat mesin hidup                        Saat mesin mati


                          Mundur
                                             Maju




            (Bersatu dengan housing)


(Bersatu dengan intake
      camshaft)
                                                               11
                  OCV (Oil Control Valve)


            Arah gerakan spool valve


    Besar     Duty ratio     Kecil

Advance                       Retard
chamber                      chamber




    Drain     Pompa        Drain       Spool valve



                                                     12
MAJU




                                                             Signal maju
                                                           Duty ratio : Besar
                                      VVTi
  Putaran                             controller
  mesin




                                                                  Engine
                                                                    ECU

                                     Oil           Drain
            Operating direction of   pressure
                 spool valve                                                    13
MUNDUR




                                            Signal mundur
                                            Duty ratio: Kecil

 Arah
putaran
                  Arak gerakan dari
                     spool valve




DVVT controller
                                                 Engine ECU



                    Drain    Oil pressure
                                                                14
MENAHAN




                   Signal menahan ditengah
                         Duty ratio :Tengah




                                   Engine ECU




          Oil pressure
                                              15
                                       OUTLINE OF VVTi CONTROL
               VVTi controller
                                                             Cam angle sensor
 Advance

      Retard

                                         Intake cam shaft
   OCV




                                         Exhaust cam shaft




Oil pump




                  Crank angle sensor

                                             ECU
                                                                   Each sensor

                                                                           16

								
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