VariabelVentilzeiten

VariabelVentilzeiten, often abbreviated as VVT, refers to a technology used in internal combustion engines that allows for the adjustment of the timing of the intake and exhaust valves. This adjustment is not fixed but can be altered dynamically based on engine operating conditions, such as engine speed and load. The primary goal of VVT is to optimize engine performance, fuel efficiency, and emissions across a wider range of operating scenarios than a fixed valve timing system.

Traditional engines operate with a fixed valve timing, meaning the valves open and close at the same crankshaft angles regardless of how the engine is running. This fixed timing is typically a compromise, designed to offer a balance between performance at high engine speeds and efficiency at lower speeds. VVT systems overcome this limitation by employing mechanisms that can advance or retard the opening and closing points of the valves relative to the piston's position.

There are several types of VVT systems, including hydraulic, electric, and mechanical. Hydraulic systems, the most common, use engine oil pressure controlled by solenoids to alter the position of camshafts or camshaft phasers. Electric systems utilize electric motors to achieve the same effect, offering potentially faster response times. The benefits of VVT include improved torque across the engine's RPM range, better fuel economy due to more efficient cylinder filling and scavenging, and reduced exhaust emissions, particularly NOx, by manipulating valve overlap.