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