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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.

Refreshed 2015 Audi A8 starts at $77,400*

Audi definitely made the US wait for the refreshed 2015 A8 and S8. The updated models were first unveiled last summer, but it has taken until June for the revised flagship sedan to reach dealers here.
The refreshed A8 line doesn't come cheap, though. Prices are up $2,000 or more over the 2014 model year. The basic 3.0T model goes for $77,400 or $81,400 for the long wheelbase version. The long wheelbase TDI is $85,100. The standard 4.0T model asks $86,400 or $90,400 for the longer one. An S8 sets back buyers $114,900, and the full bore A8L W12 is $137,900. All of these prices exclude destination (which was $895 last year and now stands at $925, according to Audi representative Mark Dahncke).
To make the wait worth it, Audi is packing the sedan with new technology and given it the slightest restyle. All models of the luxurious vehicle now come standard with full LED headlights. The 2015 model also benefits from electromechanical steering, available variable ratio steering and active lane assist. The night vision system is also updated to detect animals and alert the driver. Mechanically, there are some tiny tweaks as well. The 4.0T V8 is boosted to 435 horsepower, compared to 420 hp previously, and the 6.3-liter W12 now has cylinder deactivation.

2015 Audi A6 spiffs up for Paris Motor Show duty

While the big names at the Audi booth might be dominated by the TT line, it's not the only product getting some attention from the German company. The A6, on sale in its present form since 2012, is getting its official mid-cycle refresh.
Featuring light exterior freshening, the new fascia wears a tweaked grille and slimmer, more expressive headlights. The rear end sees more substantial changes, with a freshened rear bumper that features rectangular exhaust outlets and more dramatically redone taillights.
Under hood, the 3.0-liter, supercharged V6 engine now produces 329 horsepower, while the 3.0-liter, turbodiesel V6s are available in 215- or 268-hp varieties, or in twin-turbocharged form, with 315 hp or 322 hp. The other big powertrain news surrounds the transmission. Audi has finally dropped the continuously variable transmission from the base, front-drive A6, slotting in a dual-clutch transmission in its place.