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The working principle of Audi AVS
  • Automotive

The Audi variable valve lift system (Audi Valvelift System) is used for a 3.2 liter V6 FSI cylinder direct injection gasoline engine. The 3.2 liter V6 FSI in cylinder direct injection gasoline engine will be used as the first batch of the first batch of FSI V6 engines to apply the Audi AVS variable valve lift system. This engine can maximize the output of the 197kW. Power. The Audi AVS variable valve lift system controls the timing and lift of the intake valve of the gasoline engine, and this technology takes the lead in introducing Audi 2.8 litres and 3.2 liters of FSI V6 engines, and is carried on A4, A5, A6 and A8. In June 2008, Audi officially launched the four cylinder engine version of the AVS variable valve lift system. The Audi AVS system, like the Honda i-VTEC system, can further control the opening lift of the intake valve. The difference lies in the design of the spiral groove sleeve, which is responsible for the change of the lift. The common VVT variable valve timing system can only adjust the opening time of the inlet or intake and exhaust doors, while the Audi AVS system, like the Honda i-VTEC system, can further control the opening lift of the intake valve. The mechanical structure of the Audi AVS variable valve lift system is slightly different from that of the Honda i-VTEC: in the camshaft responsible for controlling the intake valve, there are two different angles of cam and the spiral groove sleeve responsible for the change of the lift. The spiral groove sleeve is controlled by an electromagnetic actuator to switch two sets of different cams to change the opening lift of the intake valve. With the high load of the engine, the AVS system moves the cam to the right to push the cam to 7 millimeters, so that the larger angle cam drives the valve top; in this case, the valve lift can reach 11 millimeters to provide the best intake flow and flow velocity of the combustor to achieve a stronger power output. In the case of low engine load, in order to pursue engine fuel saving, the AVS system then pushes the cam to the left side and pushes the valve top with a smaller cam. At this time the valve lift can be adjusted between 2 and 5.7 mm. Because of the asymmetric intake lift design, the air enters the combustor in a spiral way, and the design of the combustion chamber and piston head with the special outline can further optimize the oil and gas mixing in the cylinder. The Audi AVS variable valve lift system can operate between 700 to 4000RPM speed, and the biggest advantage of the AVS system is that it can reduce fuel consumption by 7%. Especially when the cruise speed is carried out in the transit speed domain, the fuel saving effect of the AVS system is most obvious. With the aid of the AVS system, the intake flow control of the cylinder is more precise than before. Generally, the engine is only controlled by the throttle to control the intake flow. In the case of low load, the air resistance of the throttle is not completely opened, which often causes unnecessary pump loss. With the application of AVS system, throttle valve can be fully opened even under low load condition, and the intake flow is precisely controlled by the AVS system. Audi will also continue to develop the AVS system. In the future, the AVS system is expected to have cylinder management functions and can be shut down in a low load case to reduce fuel consumption.

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