What does vvt mean in the back of the car?

VVT (variable valve timing) variable valve timing system. The system adjusts the phase of the engine cam through the equipped control and execution system, so that the opening and closing time of the valve changes with the change of the engine speed, thus improving the charging efficiency and increasing the engine power.

principle

The principle of engine variable valve timing technology (VVT) is to adjust the intake (exhaust) amount, valve opening and closing time and angle according to the engine operation, so as to achieve the best intake amount and improve the combustion efficiency. Advantages are fuel saving, high power-to-lift ratio, and disadvantages are insufficient middle speed and torque.

VVT technology

The VVT of Korean cars is based on the VVT-I of Toyota in Japan and the VTEC technology of Honda. However, compared with Toyota's VVT-I variable timing valve technology, VVT is only a variable valve technology and lacks timing technology, so VVT engine is indeed more fuel-efficient than ordinary engines, but not as fuel-efficient as Toyota and Honda cars of Japanese cars.

BMW has adopted this technology in the previous generation engines, such as Honda's VTEC, i-VTEC,; Toyota's vvt-I; Nissan's CVVT；; ; Mivik; Mitsubishi; Suzuki's VVT；; ; Modern VVT；; ; Kia's CVVT；; ; VVT； Jianghuai; The VVT of the Great Wall has gradually begun to be used. Generally speaking, it is actually a technology with different names.