Now, the Audi valvelift system can achieve variable control of its valve lift. This affects the intake duct’s cross-section.

Audi Valvelift System (AVS) has been revealed after six years of development. The system is now available for direct-injection V6-FSI engines 2.8-liter and 3.2-liter. It allows for smooth power buildup, spontaneous throttle response, and, most importantly, reduced fuel consumption of up to seven percent.

The existing variable valve timing system allows for the valve opening/closing times to be adjusted. Now, the Audi valvelift system can achieve variable control of valve lift. This will influence the cross-sectional area of the intake pipe.

Variable valve lift can range from 2.0 mm to 5.7 mm under partial engine loads. The inlet valves can still lift up to 11.0mm under heavy loads. This is ideal for high flow rates and charge volumes in the combustion chamber. Asymmetrically controlling valve lift allows the charge air to flow spirally and circularly into the combustion chamber, also known “drumble”. The ultimate goal is to open and close valves so that the correct amount of air is drawn into the cylinders.

The AVS has an operating range of 700 to 4000 RPM, but can handle speeds up to 7000 RPM. The future development of AVS will allow for the complete shutdown of individual combustion engines.