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03-02-2010, 03:02 PM
The efficiency standard - the Audi A8 hybrid (http://www.audizine.com/news/news.php?nid=148)
March 2, 2010 - Audi AG

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Power like a big V6, fuel economy like a modest four-cylinder unit - Audi presents the A8 hybrid as a technology concept at the Geneva Motor Show. Its two propulsion units - a 2.0 TFSI and an electric motor - develop a total output of 245PS of system power and 480 Nm (354.03 lb-ft) of torque. This enables the Audi A8 hybrid to accelerate in 7.6 seconds from zero to 62mph and to achieve a top speed of 146mph. Yet average economy amounts to up to 45.6mpg - the CO2 equivalent is 144 grams per km.

The combustion engine of the Audi A8 hybrid is the 2.0 TFSI - a high-tech powerplant. This four-cylinder unit, which has been named "Engine of the Year" five times in a row since 2005, is an example of Audi's downsizing philosophy. It combines direct fuel injection with turbocharging and the AVS Audi valvelift system, which regulates the valve lift in two stages. In combination with the adjustable intake camshaft, the Audi valvelift system improves cylinder charging and ensures spontaneous and powerful torque build-up. The 2.0 TFSI delivers 211PS and 350 Nm (258.15 lb-ft); the torque value remains constant from 1,500 to 4,200 rpm.

In the crankcase of the four-cylinder unit, which has a displacement of 1,984 cc, two balancer shafts offset second-order inertial forces to ensure virtually vibration-free and pleasantly quiet operation that goes well with the luxurious character of the A8. All components are optimized to minimize friction. The flow-rate-regulated, pressure-controlled oil pump further reduces fuel consumption. More (http://www.audizine.com/news/news.php?nid=148)

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