VVT-i. The system is the abbreviation Toyota intelligent variable valve timing system. In recent decades, based on improving power, economy and reduce engine emissions requirements for cars, many countries and engine manufacturers, research institutions put a lot of manpower and material resources to carry out research and development of new technologies. At present, these new technologies and new methods, and some have been used in internal combustion engines, is in some stage of development and improvement, could become the future direction of the internal combustion engine technology.
variable valve timing engine technology (VVT, Variavle Valve Timing) are increasingly used in recent years is a new technology of the modern car engine with variable valve timing can be improved into intake charge, so that the volumetric efficiency increases, the engine torque and power can be further improved.