VVT-i, or Variable Valve Timing with intelligence
#1

VVT-i, or Variable Valve Timing with intelligence, is an automobile variable valve timing technology developed by Toyota. The Toyota VVT-i system replaces the Toyota VVT offered starting in 1991 on the 4A-GE 20-Valve engine. The VVT system is a 2-stage hydraulically controlled cam phasing system.

VVT-i, introduced in 1996, varies the timing of the intake valves by adjusting the relationship between the camshaft drive (belt, scissor-gear or chain) and intake camshaft. Engine oil pressure is applied to an actuator to adjust the camshaft position. In 1998, 'Dual' VVT-i (adjusts both intake and exhaust camshafts) was first introduced in the RS200 Altezza's 3S-GE engine. Dual VVT-i is also found in Toyota's new generation V6 engine, the 3.5L 2GR-FE V6. This engine can be found in the Avalon, RAV4, and Camry in the US, the Aurion in Australia, and various models in Japan, including the Estima. Other Dual VVT-i engines will be seen in upcoming Toyota models, including a new 4 cylinder Dual VVT-i engine for the new generation 2007/2008 Corolla. Another notable implementation of the Dual VVT-i is the 2GR-FSE D-4S engine of the Lexus GS450h. By adjusting the valve timing, engine start and stop occur virtually unnoticable at minimum compression, and fast heating of the catalytic converter to its light-off temperature is possible, thereby reducing HC emissions considerably.
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#2
whers the full report
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#3
[Image: inside-of-vvti-engine.jpg]
VVT-i, or Variable Valve Timing with intelligence, is an automobile variable valve timing technology developed by Toyota, similar to the i-VTEC technology by Honda. The Toyota VVT-i system replaces the Toyota VVT offered starting in 1991 on the 4A-GE 20-Valve engine. Perodua use this technology and convert the name to DVVT(Dual Variable Valve Timing). The VVT system is a 2-stage hydraulically controlled cam phasing system.

VVT-i, introduced in 1996, varies the timing of the intake valves by adjusting the relationship between the camshaft drive (belt, scissor-gear or chain) and intake camshaft. Engine oil pressure is applied to an actuator to adjust the camshaft position.

Engine designers have known for a long time that they could get better performance out of an engine under certain circumstances by allowing the intake valve to open slightly before the exhaust valve closes. This increases the time for the fuel/air mixture to enter the cylinder during the intake stroke. In this condition the exhaust and intake valves are open at the same time; this is called Ëœvalve overlapâ„¢. In conventional engines Ëœvalve overlapâ„¢ timing is fixed.

Fixed valve overlap allows the engine to perform well within a certain rev range, however there are three main undesirable side effects.

1) Fuel is wasted “ the fuel/air mixture is not always efficiently burned and this causes unburnt fuel to pass through the engine.

2) Higher levels of undesirable exhaust emissions are produced.

3) Power output potential is not fully realised.



Variable valve timing allows the relationship between the separate inlet and exhaust camshafts to vary the valve timing overlap. In doing so it overcomes the side effects described above by using a computer to continuously vary the intake valve timing and overlap. The valve timing and overlap are adjusted through a series of simple mechanisms to ensure the optimum conditions apply across all the working rev range. The advantages are lower fuel consumption, lower exhaust emissions and higher power output. Because the system is continuously variable, an Ëœiâ„¢ for Ëœintelligentâ„¢ has been added to the acronym.



In 1998, Dual VVT-i (adjusts both intake and exhaust camshafts) was first introduced in the RS200 Altezzaâ„¢s 3S-GE engine. Dual VVT-i is also found in Toyotaâ„¢s new generation V6 engine, the 3.5L 2GR-FE V6. This engine can be found in the Avalon, RAV4, and Camry in the US, the Aurion in Australia, and various models in Japan, including the Estima. Dual VVT-i is also used in the Toyota Corolla (1.6 dual VVT-i 124bhp).

Other Dual VVT-i engines include the 1.8L 2ZR-FE I4, used in Toyotaâ„¢s next generation of compact vehicles such as the Scion XD. It is also used in the 2JZ-GE and 2JZ-GTE engines used in the Lexus IS300 and in the Toyota Supra. By adjusting the valve timing engine start and stop occurs virtually unnoticeably at minimum compression. In addition fast heating of the catalytic converter to its light-off temperature is possible thereby reducing hydrocarbon emissions considerably.

read more http://en.wikipediawiki/VVT-i
http://kereta.info/how-toyota-vvti-engin...telligent/
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#4
where i gt the full report..
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#5
ambarishster use this links
http://ncttorafsm/2003/4runner/215/ncf/1gr-fe_vvtisystem.pdf
http://pmgsinterdownloads/orlando2002_wied.pdf
http://www-personal.umich.edu/~hpeng/ACC2000_Mianzo.pdf
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#6
want more info onVVT-i, or Variable Valve Timing with intelligence
and fuel energiser
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#7
see this vedio
http://googleurl?q=http://youtubewatch%3Fv%3DzpERYiHR0NU&ei=M_K9SqTwE4GIkQXXwKFW&sa=X&oi=video_result&resnum=11&ct=thumbnail&usg=AFQjCNGW6vsGx2RrO5ueYHCLepSDvW7ZSA


http://youtubewatch?v=iKo28HMLhK0
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#8


to get information about the topic VVT-i full report ,ppt and related topic refer the page link bellow

http://studentbank.in/report-vvt-i-or-va...telligence

http://studentbank.in/report-vvt-i--2151
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