What is the difference between CVVL technology and VVT?

[StArya]

CVVL technology and VVT technology have significant differences. The specific distinctions are as follows: Meaning of the two technologies: CVVL technology stands for Continuous Variable Valve Lift technology, which is a continuous valve lift adjustment. VVT, short for Variable Valve Timing, represents variable valve timing control technology, with an added emphasis on continuity. It controls the valves based on the engine's current operating conditions, maintaining optimal combustion when the engine speed decreases and delivering greater torque. Operation process of the two technologies: CVVL technology uses an electronic hydraulic control system to adjust the timing of the camshaft opening the intake valves, thereby controlling the valve overlap angle. This technology can alter the engine's intake and exhaust timing. VVT, or variable valve timing, is a technology used in automotive piston engines to adjust the overlap timing and timing of the engine's intake and exhaust systems, also helping to reduce fuel consumption. Advantages of CVVL technology: CVVL technology offers many practical benefits to consumers, with the most notable being reduced fuel consumption. Under low-load conditions, it uses lift control instead of throttle control, reducing throttle loss, increasing intake pressure, maintaining higher cylinder pressure, and minimizing the work consumed during the gas exchange process, thereby lowering pumping losses.

[Boromir]

VVT stands for Variable Valve Timing technology, primarily responsible for adjusting the timing of valve opening and closing. CVVL, on the other hand, is more advanced—it not only adjusts timing but also continuously regulates the depth of valve opening. To put it simply, VVT is like a fixed-size faucet that only controls the on/off timing, while CVVL can precisely adjust the flow rate. When used together, they significantly benefit the engine, delivering noticeable power gains while improving fuel efficiency. However, CVVL has a more complex structure, demands higher control precision, and naturally comes with higher costs, which is why it’s commonly found in premium brands like BMW.