What is the difference between DVVT and VVT engines?

[AnthonyMarie]

The difference between DVVT and VVT engines lies in their adjustment methods: DVVT engines can simultaneously adjust both intake and exhaust valves, exhibiting excellent characteristics of high torque at low speeds and high power at high speeds; VVT engines can only adjust the intake valves. VVT is a technology used in automotive piston engines that can adjust the overlap timing of the engine's intake and exhaust systems, reducing fuel consumption and improving efficiency. An engine is a machine capable of converting other forms of energy into mechanical energy, applicable both as a power generation device and as an entire machine including the power unit. Its types include internal combustion engines, external combustion engines, gas turbines, and electric motors.