What does engine VVT technology mean?

[LaBryce]

Engine VVT technology stands for Variable Valve Timing, which is a technology used in automotive piston engines. VVT technology can adjust the overlap time and timing of the engine's intake and exhaust systems, reducing fuel consumption and improving efficiency. The crankshaft drives the camshaft through a timing belt, gear, or chain. The profile and position of the cams on the camshaft are usually optimized for engine speed, which typically reduces torque at low speeds and power at high speeds. The engine has an ideal operating condition at different speeds: delaying the intake valve opening time, reducing the valve overlap angle, stabilizing the combustion state at idle, reducing fuel consumption and emissions at medium loads, and improving engine efficiency at high speeds.