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Audi says new 48 volt micro-hybrid system improves fuel economy, paves way for electrification

Most cars use a 12-volt system to power their electrical components. But, with more and more electric bits and bobs being added to new vehicles, a dozen volts is looking a bit weak these days. In fact, Audi says that standard 12-volt systems are being stretched "to their very limits." Enter 48 volts. If used in a car that gets 40 mpg, that would translate to around 43.5 mpg. Audi is testing a supplemental 48-volt electric system in two prototype vehicles – modified mild-hybrid versions of the A6 TDI and the RS 5 TDI – in order to add in more electric technology (an electric compressor, for example, to improve acceleration) and "convenience systems for dynamic chassis control." Audi says it has more applications in the pipeline, but the overall gist is that the German automaker sees 48 volts as an "important building block in electrification strategy." As you can see in the picture above (click to enlarge), the RS 5 TDI concept uses a li-ion battery installed in the back of the car and an alternator to provide 48 volts when the engine is off. Audi says that the 48-volt system can save up to 0.4 liters of fuel per 100 kilometers. To put that into US numbers, if used in a car that gets 40 miles per gallon today, that would translate into a bump up to around 43.5 mpg. The Advanced Lead Acid Battery Consortium (ALABC) is also working on a 48-volt system to improve fuel economy and we've got a deep dive of Audi's electric turbocharger here. Even more powerful and efficient – the new 48-volt technology from Audi Important building block in electrification strategy More voltage and more power for new technologies Scalable platform concept suitable for wide-ranging uses Ingolstadt, August 25, 2014 – Audi is to upgrade part of its vehicle electrical system from twelve to 48 volts. The move represents another technical building block for facilitating the integration of new automotive technologies while increasing the power and efficiency of its cars. "We are using the full bandwidth of electrification in our drive principles strategy. Running part of the vehicle electrical system at 48 volts plays a central role in this," commented Prof. Dr. Ulrich Hackenberg, Member of the Board of Management for Technical Development at Audi. "It enables us to make more energy available.

Audi Prologue Avant Concept points to the future of wagon design in Geneva [w/video]

The new generation Audi R8 and its LMS GT3 racing version are grabbing much of the attention at the Audi stand at the Geneva Motor Show. However, if you are more interested in seeing the brand's future design direction, just take a look at the Prologue Avant Concept that's also on display. Audi traditionally uses the Avant name for the company's wagons, but that's tweaked slightly here. The vehicle is certainly a five-door, but from some angles it looks more akin to a Porsche Panamera-like hatchback. Compared to the B-pillarless Prologue Coupe (that we recently drove), the stretched roof flows all the way to the angled rear hatch, and the result is a very elegant design. The interior tends towards minimalism with just a few screens showing the driving info. The Prologue Avant also ditches the Coupe's petrol-fueled hybrid for a 3.0-liter, twin-turbo diesel V6 plug-in hybrid with a total of 455 horsepower and 553 pound-feet of torque, which is linked to an eight-speed gearbox. Audi claims the setup reaches 62 miles per hour in 5.1 seconds and allows for 33 miles of pure electric driving. To get a sneak peek at what's next from Audi, take a look at the Prologue Avant Concept on the floor of the Geneva show in the gallery above.

Audi Prologue Avant puts new styling focus on wagons

As much as we loved the Audi Prologue Concept that debuted late last year at the LA Auto Show – and, suffice it to say, we liked the first Prologue a lot – this new Prologue Avant from the German automaker may just rock our socks that much further off our feet. We have very little by way of actual, concrete details on what's under the angular wagon-shaped skin of the Prologue Avant, but we'd be perfectly content if it kept the previous two-door's 4.0-liter twin-turbo V8 in place underhood, augmented as it was when it was again shown at CES last month with a hybrid-assist system that put total system horsepower at 677, along with a meaty 701 pound-feet of torque. With all that power routed to all four wheels through an eight-speed automatic transmission, the 0-60 time of just 3.5 seconds strikes us as plenty quick. The powertrain details hardly seem the point of this new concept from Audi, in any case. Clearly, the big deal is the new bodywork, which builds upon the beautiful foundation of the original Prologue coupe with an elongated wagon shell and three additional doors (two rear doors and a rear hatch). The attractive body sits low to the ground on exaggerated 22-inch wheels, according to Auto Express. We note high-tech lighting elements front and rear and a modified front fascia with a bit more brightwork than the previous version. Assuming there's a bit of future reality baked into the Prologue Avant – which we believe is likely, considering that the coupe we salivated over in LA was said to point the way forward for the brand – it's safe to say we're in eager anticipation of the next several years at Audi. Have a good look at the images that have so far been released, and feel free to let us know what you think. We're sure Audi is interested in hearing your opinions, too. Related Video: News Source: Audi via Auto Express Design/Style Geneva Motor Show Audi Wagon Concept Cars Future Vehicles Hybrid Luxury Performance 2015 Geneva Motor Show