presentasi vvt-i unautorized
TRANSCRIPT
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VVTiVVTi(Variable Valve Timing Intelligent)
DAIHATSU MOTOR CO.,LTD.
OVERSEAS SERVICE DIVISION
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Engine Performance (Torque)
Improved
About 10 %
Fuel Economy
Improved
About 6 %
NOx Decreased
About 40 %
ADVANTAGEEngine : K3-VE
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VVTi SYSTEM
Engine : K3-VE, EJ-VE
BDC
TDC
2°EX close
12°30°
52°
10° 30°EX openIN close
IN open
Enginerotatingdirection
Valve Timing
VALVE TIMING
VVTi CONSTRUCTION
VVTi CONTROL
CONTENTS
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TDCTDC
BDCBDC
ININ
EXEX
Mengurangi overlap
Gas buang yang balik ke intake port
akan tidak ada
Pembakaran stabil
Menambah hemat bahan bakar
VALVE TIMINGVALVE TIMING
SAAT IDLING
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Menambah overlap
Internal EGR
rate bertambah
Mengurangi
pumping loss
Mengurangi emisi Nox dan membakar kembali HC
Menambah hemat bahan bakar
SAAT BEBAN RINGAN DAN SEDANG
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Saat menutup intake valvemaju
Memperbaiki volumetric efficiency
Menambah out put
SAAT BEBAN BERAT KECEPATAN RENDAH DAN SEDANG
Gas buang yang balik ke intake port akan tidak ada
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Saat menutup intake valvemundur sesuai dengan kecepa
tan mesin.
Saat penutupan valve sesuai dengan gaya inersia aliran udara y
ang masuk
Improved volumetric efficiency
Improved output
SAAT BEBAN BERAT KECEPATAN TINGGI
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RangeKerja mesin Valve timing
1 Idling
2 Beban ringan
3 Beban sedang
4
RPM sedang
&
Beban berat
5
RPM tinggi
&
Beban berat
TMA TMB
EX
IN
EX
IN
EX
IN
EX
IN
EX
IN
Beb
an
RPM Mesin
Range 4 Range 5
Range 3
Range 1
Range 2
RANGKUMAN
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DVVT/VVTi CONTROL
OCV
Engine ECU
Target valve timing
Compensation
Actual valve timing
Throttle sensor
Crank angle sensor
Water temp. sensor
Pressure sensor
Cam angle sensor
Feedback
control
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KONSTRUKSI VVTi
Cam anglesensor
Crankanglesensor
OCV
VVTi
controller
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(Bersatu dengan intake camshaft)
(Bersatu dengan housing)
Lock pin
Tekanan Hydraulic Tekanan
pegas
Saat mesin hidup Saat mesin mati
MundurMaju
KONTROL VVTi
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Drain DrainPompa Spool valve
Advance
chamber
Retard
chamber
Arah gerakan spool valve
OCV (Oil Control Valve)
Duty ratio KecilBesar
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VVTi
controller
Oil pressure
Putaran mesin
Signal maju
Duty ratio : Besar
Engine
ECU
MAJUMAJU
Drain
Operating direction of
spool valve
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Arah putaran
Oil pressure
Engine ECUDVVT controller
Arak gerakan dari spool valve
MUNDURMUNDUR
Signal mundur
Duty ratio: Kecil
Drain
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Engine ECU
Oil pressure
Signal menahan ditengah
Duty ratio : Tengah
MENAHANMENAHAN
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Each sensor
OCV
Oil pump
ECU
Cam angle sensorVVTi controller
Intake cam shaft
Exhaust cam shaft
Crank angle sensor
Retard
Advance
OUTLINE OF VVTi CONTROL