ldquo; three years ago, Audi predicted that the global energy and environmental situation decide the future of large displacement engine car will not meet social development. From that time, Audi began to study the transformation of technology to reduce emissions while maintaining the power of performance, 3.0TFSI engine is developed from the beginning. rdquo; Tang Mai told reporters at the listing ceremony of 09 A6L. M is a powerful torque;
A6L 09 equipped 3.0TFSI engine can output 213 kilowatts (290 hp) and maximum power 420Nmiddot. Thus good performance comes from two technical support and supercharged direct injection gasoline. According to statistics, this 3.0TFSI supercharged V6 gasoline direct-injection engine compared with the previous 3.2L engine, the maximum power increased by 30%, fuel consumption was reduced by 13%, 0-100km / h acceleration in just 6.6 seconds.
in line with the principles of the Audi FSI gasoline direct injection technology is the primary prerequisite for its excellent fuel efficiency. Wherein the fuel injection system is a new design, common rail injection system fuel injection nozzle carried by six holes 150 bar high pressure direct injection of fuel into the combustion chamber. Fuel injection nozzle so excellent responsiveness can be up to three times the fuel injection in each compression stroke, thus optimizing the combustion process, to enhance the performance of the engine. The engine exhaust emissions has reached Europe Ⅴ standard, represents the latest standard Audi engine.
3.0TFSI 10.5:1 engine compression ratio is high, also played an important role in improving the efficiency. FSI is also reason for using direct fuel injection, intense swirl the fuel combustion chamber rotates rapidly cooled down, reduces the probability of engine knock.
lightweight design has also been applied to this engine series. In addition to the standard 90-degree angle comprises a cylinder, Al-Si alloy casting 3 liter crankcase only 33 kg weight; comprising an engine including a supercharger weighs 189 kg.
Audi engineers also increases the stress level in the crankcase of this engine, to reduce the frictional resistance between the associated components. Two intake camshaft phase adjustment range of up to 42 degrees crank angle. Thereby forming more conducive intake swirl in the inlet of the fuel air mixture.
●Technical trade-offs between the supercharger and turbocharger
From the late 1970s, Audi began to focus on research and development of turbocharger technology, which helped Audi to dominate the world of motorsport. The supercharger now come back, over the supercharging for the new technologies 3 liters V6 TFSI engine, but this time the letter ldquo; Trdquo; Audi engine series are no longer merely representative of the turbocharger, but represents the engine forced induction.
ldquo; for a 6-cylinder engine, a supercharger select special reasons, because it would be more direct and effective in the transfer of kinetic energy, and thus the acceleration time of the vehicle faster and more fuel efficient. rdquo; technical background Tangmai explain in detail the reasons supercharged V6 engine choice rather than turbocharged with reporters.
ldquo; selection key supercharger and a turbocharger in the length of the intake manifold, if further selection turbocharged V6 engine, the air flow will take a long time, the engine will produce a reaction delay. In contrast, 2.0TFSI turbocharged engine choice, also because it is four-cylinder engine, the intake manifold itself is short, through the short-turbocharger intake manifold to play fast and effective efficiency, there is no need to do by mechanical pressure. rdquo; Tangmai say, ldquo; supercharger gas path is very short, which means that the torque increases very fast, even faster than the response with the displacement of the naturally aspirated engine. For 3.0TFSI engine throttle response is very sensitive, it can easily soar to 6500 rev / min. rdquo;
According to reports, the two four-leaf supercharger 3.0TFSI new rotary piston engines speeds up to 23,000 revolutions / minute, the blade clearance with the housing only thousandths of a millimeter. 1000 kg per hour, the rotor may be transmitted stream. Integration of two water-cooled aluminum mounting intercooler are connected to a separate cooling circuit, through which the compressed hot air is again cooled, thereby increasing the oxygen content of the air entering the combustion chamber. This series of measures to make the supercharger noise to a minimum.