cơ cấu phân phối khí thông minh vvt

Transportation Mechanical EngineeringVariable Valve Timing VVT Lecturer: Pham Quoc Thai University of Science and Technology Members:  Dang Nhat Linh  Nguyen Nam Ha  Dang Tuan... A VV

Transportation Mechanical Engineering

Variable Valve Timing (VVT)

Lecturer: Pham Quoc Thai

University of Science and Technology

Members:

 Dang Nhat Linh

 Nguyen Nam Ha

 Dang Tuan

I Introduce

II Characteristics

III Application

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I INTRODUCE

What is the

VVT system?

A VVT system allows the lift, duration or timing (in

various combinations) of the intake or exhaust

valves to be changed while the engine is in operation.

Which results in greater efficiency and power, over a

wider range of engine RPMs.

I INTRODUCE

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I INTRODUCE

 Mixture of the fuel and air is poor

 Fuel does not burn completely

 Low performance

 Waste of fuel

 Environmental pollution

1 Change of the valve timing

 Late intake valve closing

 Early intake valve opening

 Early exhaust opening

 Late exhaust closing

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Thus, it changes time providing

fuel for the engine and

exhausting

Variable Valve-Timing systems use

a cam Phasing Mechanism

SOHC DOHC

2 Change the lift and duration of the valve

The shape of their camshaft lobes

II.CHARACTERISTICS

Improve the efficiency of car engines

III APPLICATION

Variants of the system VVT-i:

 VVTL-i: Variable Valve Timing and Lift intelligent

system

The 2ZZ-GE engine, the first to feature VVTL-i

 Dual VVT-i: Adjusts timing on both intake and

exhaust camshafts

 VVT-iE: Variable Valve Timing - intelligent by

Electric motor

 VVT-iW: Variable Valve Timing - intelligent Wide

 Valvematic: Control the amount of fuel / air by

using valve control

Variants of the system VTEC:

 VTEC-E: Short cam axis, reduces fuel

consumption

 3STAGE VTEC: Use 3 different cam

modes operating in 3 phases

 i-VTEC: Optimized torque and fuel

economy

 AVTEC: Save 13% on fuel compared to

i-VTEC and reduce emissions by up to 75%

These upgrades will increasingly meet the needs of customers

BENEFIT

Money Environment

THANK YOU FOR YOUR

SPENDING TIME WITH US

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