Blog yang khusus membahas tentang otomotif, baik sport atau sekedar berita otomotif. Tetapi tidak menutup kemungkinan blog ini juga membahas hal yang lain seperti mengenai komoputer, dll. Enjoy this !!!
Forza Ferrari !!!
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VVT-i
Rabu, 12 September 2007
VVT-i(Variable Valve Timing Intelligent)
Untuk menghitung waktu buka tutup katup (valve timing) yang optimal, ECU (Electronic Control Unit) menyesuaikan dengan kecepatan mesin, volume udara masuk, posisi throttle (akselerator) dan tempratur air. Agar target valve timing selalu tercapai, sensor posisi chamshaft atau crankshaft memberikan sinyal sebagai respon koreksi.
Mudahnya sistem VVT-i akan terus mengoreksi valve timing atau jalur keluar masuk bahan bakar dan udara. Disesuaikan dengan pijakan pedal gas dan beban yang ditanggung demi menghasilkan torsi optimal di setiap putaran dan menghemat konsumsi BBM. 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.
I think this one can also be found on most of the cars nowadays.
Car parts are getting more advance and evolving as years go by.