1
VVTiVVTi(Variable Valve Timing Intelligent)
DAIHATSU MOTOR CO.,LTD.
OVERSEAS SERVICE DIVISION
2
Engine Performance (Torque)
Improved
About 10 %
Fuel Economy
Improved
About 6 %
NOx Decreased
About 40 %
ADVANTAGEEngine : K3-VE
3
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
4
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
5
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
6
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
7
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
8
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
9
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
10
KONSTRUKSI VVTi
Cam anglesensor
Crankanglesensor
OCV
VVTi
controller
11
(Bersatu dengan intake camshaft)
(Bersatu dengan housing)
Lock pin
Tekanan Hydraulic Tekanan
pegas
Saat mesin hidup Saat mesin mati
MundurMaju
KONTROL VVTi
12
Drain DrainPompa Spool valve
Advance
chamber
Retard
chamber
Arah gerakan spool valve
OCV (Oil Control Valve)
Duty ratio KecilBesar
13
VVTi
controller
Oil pressure
Putaran mesin
Signal maju
Duty ratio : Besar
Engine
ECU
MAJUMAJU
Drain
Operating direction of
spool valve
14
Arah putaran
Oil pressure
Engine ECUDVVT controller
Arak gerakan dari spool valve
MUNDURMUNDUR
Signal mundur
Duty ratio: Kecil
Drain
15
Engine ECU
Oil pressure
Signal menahan ditengah
Duty ratio : Tengah
MENAHANMENAHAN
16
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