What Is VVA(Variable valve actuation) Systems?
VVA (Variable valve actuation) systems can be classified as camshaft-based systems or cam-less systems. Cam-less systems are very flexibility in valve lift and timing control but have high risk of catastrophic failure if the valve in the lifted position interfere with the piston.
Camshaft based systems are less flexible because the valve event must occur within the confines of the cam profile. While they are quite robust and interference between the piston and valve can generally be avoided even during system malfunctions. All current production VVA systems are camshaft based except some large low speed two-stroke engines.
Camshaft based systems can be classified according to their function. Valve Timing Control (VTC)—also referred to as Variable Valve Timing (VVT) systems—are the most basic camshaft based VVA technology.
Variable valve event and lift control, so called Variable Valve Lift (VVL), can provide a discrete or continuous range of lift and/or duration control between two limits. In some cases, it can allow modest adjustments in phasing. Camshaft based VVL technologies can be combined with VTC to enable variable lift and timing control.
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