What is dual VVT-i?

It is the abbreviation of Toyota Intelligent Variable Valve Timing System. VVT-I system has been widely installed in the latest Toyota engine. Toyota's VVT-I system can continuously adjust the valve timing, but it cannot adjust the valve lift.

Its working principle is that when the engine changes from low speed to high speed, the electronic computer automatically presses the engine oil to the small turbine in the driving gear of the intake camshaft, so that the small turbine rotates at a certain angle relative to the gear box under the pressure, and the camshaft rotates forward or backward within 60 degrees, thus changing the opening time of the intake valve and achieving the purpose of continuously adjusting the valve timing.

Extended data:

The advantage of VVT-i system is that it can automatically search the optimal valve timing corresponding to engine speed, intake air, throttle position and cooling water temperature under various driving conditions, and control the camshaft timing hydraulic control valve.

The actual valve timing is sensed by the signals of each sensor, and then feedback control is implemented to compensate the system error and achieve the best valve timing position, thus effectively improving the power and performance of the automobile and minimizing fuel consumption and exhaust emissions.

References:

Baidu encyclopedia -vvt-I