The technology of the Audi Sportback concept is markedly futuristic. Power is provided by the world’s cleanest diesel technology: the 3.0-liter V6 TDI clean diesel almost completely eliminates nitrogen oxides. This engine already meets the emissions limits of all 50 U.S. states and the EU6 standard scheduled to take effect in 2014. And numerous measures to ensure top efficiency mean that the Audi Sportback concept is expected to achieve impressive fuel consumption figures of 5.9 liters of diesel per 100 kilometers (39.87 US mpg).
Since its introduction in 2004, the concept of the Sportback has established itself in the compact class. The success of the Audi A3 Sportback has exceeded even the expectations of its makers – far more customers choose the four-door model with the large rear hatch than its three-door sibling.
But it is far more than two additional doors that sets the Audi A3 Sportback apart from the base model. It is characterized by the sporting elegance of a coupe, the versatility of a five-door model, sophisticated technology and pronounced sportiness – driving dynamics in a new guise.
The developers at Audi chose the world’s cleanest diesel technology as the unit best befitting the Audi Sportback concept show car. The six-cylinder 3.0 TDI clean diesel is equipped with a system for the effective reduction of nitrogen oxides. The diesel engine development engineers at Audi have combined an entire package of innovative measures for this latest TDI generation: The piezo common rail system with an injection pressure of 2,000 bar, highly efficient exhaust gas recirculation and optimized turbocharging result in significantly reduced raw engine emissions. One of the highlights are the combustion chamber sensors that enable even more precise regulation of the combustion processes in the engine – this is the first time that such sensors have been installed on any engine in the world, marking yet another Audi innovation.
The status of the new-generation TDI as the definitive clean-running, high-tech diesel is sealed by the downstream exhaust emission control system, which reduces emissions by up to 90 percent. The system uses AdBlue, a biologically degradable, waterborne additive that is injected in small amounts upstream of the DeNOx catalytic converter. In addition to the catalytic converter, the exhaust emission control system comprises the metering module, the AdBlue tank and heated lines, as well as an extensive system of sensors. The additional oxidizing catalytic converter and the highly efficient, regulated diesel particulate filter round off the comprehensive emission control system.
Thanks to their extremely low emission levels, these modern direct-injection diesel engines can be put into service anywhere in the world, even in the U.S. state of California, which has the world’s most stringent emissions limits. Compared with the fleet average of the gasoline engines typically found in the U.S., the TDI boasts a fuel-efficiency advantage of up to 40 percent. The diesel technology thus makes a greater contribution than any other type of engine to reducing the consumption of fossil fuels. Audi will offer this engine in the U.S. and Europe beginning in 2009.