HOW TOYOTA VVTi ENGINE WORKS? -Variable Valve Timing-intelligent

HOW TOYOTA VVTi ENGINE WORKS?

 

You need to a flashplayer enabled browser to view this YouTube video

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(Dynamic 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 ‘valve overlap’. In conventional engines ‘valve overlap’ 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.

You need to a flashplayer enabled browser to view this YouTube video

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 ‘i’ for ‘intelligent’ has been added to the acronym.

how vvti engine works

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. 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 Toyota’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.

inside of vvti engine

(inside of vvti engine)

vvt-i= Variable Valve Timing-intelligent

Share and Enjoy

  • wp socializer sprite mask 32px
  • wp socializer sprite mask 32px
  • wp socializer sprite mask 32px
  • wp socializer sprite mask 32px
  • wp socializer sprite mask 32px
  • wp socializer sprite mask 32px
  • wp socializer sprite mask 32px
  • wp socializer sprite mask 32px

kdi

Team KDI suka berkongsi info, tips, gambar kereta modified, bodykit dijual terkini, trend DIY modifikasi. Forum bincang mengenai masalah kereta, cara repair sendiri dengan harga murah dan panduan kepada pembeli dan pemandu. ====================== Kategori hangat kereta dot info: + LATEST NEW CAR SPECIFICATION & VS COMPARISON + MODIFIED CAR + BODYKIT IMAGES GALLERY + TIPS + DIY + TANYA KERETA + MONTHLY BEST DEAL + PROMOTION + AUTOSHOW + EVENTS UPDATE ====================== Barang kereta terhangat: + Body kit, skirting, bumper, grille, spoiler, engine performance, sport rim, tayar ====================== Topic hangat: + Fuel consumption km/l, problem, service, test drive, review, price RM, kelab, kedai kereta ====================== Kereta baru terhangat: + Saga BLM FLX SE, Myvi 1.3 1.5 SE, Viva, Alza, Exora, Preve, Vios, City, Civic, Corolla Altis, Camry, Accord, Hilux, Livina, Triton, D-max, Inspira lancer GT ====================== Pecah fiber pecah gelas, sudah baca harap komen dibalas. Terima kasih! =)

5 Responses

  1. abhi says:

    i am interested to know more about new automobile technology

  2. sifu says:

    i wanna learn about the old school engine.they have a hidden potential………
    may some one gimme the way how n where i can get the guider…….
    where are the exactly right place or person i can refer to……please.
    …………i’m the BEGINNER………

  3. kdi says:

    maybe you can try search via youtube.com about the engine operation

  4. James says:

    On a newly rebuilt 1.8L 1zz-fe, what would not allow oil to flow to the VVTi controller when the OCV and it’s screen has been replaced?

  5. mohamed says:

    i have a toyota fun cargo with a 1nze engine and it burns more fuel than the ae 100 corolla wagon with a 5a engine

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>

What is 21 + 15 ?
Please leave these two fields as-is:
IMPORTANT! To be able to proceed, you need to solve the following simple math (so we know that you are a human) :-)