What is the principle of variable valve timing technology?

The principle of VVT (Variable Valve Timing) technology is to adjust the intake (exhaust) amount, valve opening and closing time and angle according to the running situation of the engine, so as to make the intake amount reach the optimal value and improve the combustion efficiency. Its advantages are fuel saving and high power ratio; The disadvantage is the lack of speed and torque in the middle section.

Technology:

VVT technology has a history of more than 30 years. 1980, AlfaRomeo used VVT technology for the first time. Honda, 1989, used VVT technology with variable valve lift for the first time; Bmw, at 200 1, used VVT technology to replace the traditional throttle for the first time.

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.