In contrast to the fixed valve timing of conventional engines, the VVT-I system is an computer controlled mechanism that continually varies the timing for opening and closing the intake valves in accordance with the vehicle's operating conditions.
BY determining the level of performance that is demanded of the engine at a given time by way of the driver's accelerator operation and the engine rpm, the VVT-I enables the overall performance of the engine to be enhanced all the way from the low to the high rpm range.
VVT-I is comprised of three major components
1.The electronic control unit(ECU), which calculates optimum intake valve timing based on engine operating conditions.
2.The oil control valve (OCV), which controls hydraulic pressure under the ECU's instruction and
3.The VVT pulley, which continuously changes the intake valve timing using hydraulic pressure.
The VVT-I is an engine control system that has achieved high levels of the seemingly opposing performances of Higher power out-put, Lower fuel consumption, Cleaner exhaust gases.
How VVT-I will help ?