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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.

2014 Audi SQ5

It may be obvious at this point, but here in the United States, European manufacturer routinely give us the short end of the stick. Now, I'm not talking about models or brands that don't come here, like the Mercedes-Benz A-Class or the entire Renault line. No, instead, I'm referring to cars that are sold right here in the Land of the Free in one bodystyle, while Europe enjoys the same vehicle with a wider variety of configurations.
A prime example of this is the Audi S4/S5 line. In America, we can have the supercharged twins in two-door coupe, four-door sedan, and cabriolet body styles. Meanwhile, our Euroland cousins get the same trio of bodystyles, as well as the A5/S5 Sportback, a characterful 'four-door coupe,' and a versatile hauler, the S4 Avant. At first glance, Audi of America lacks a vehicle that can compete with the latter's blend of performance, versatility and subdued looks. So, what's an American with around $60,000 and an obsession with quick, conservative haulers to do? Well, he can buy an SQ5. (Though it bears mentioning, our US-spec SQ5 is vastly different than what's available to our European friends.)
The SQ5 has a huge number of things going for it that make it a viable alternative to a proper hot wagon, and foremost among them are its looks - this is a sleeper. Audi has thankfully decided not to molest the clean looks of the standard Q5 when penning the sportier model.

Audi moves to patent electric Quattro and active-shutter wheels

Audi might have a few tricks up its sleeve for the coming years, with the Brits at Autocar uncovering a pair of patent filings made by the German luxury brand. The first is something we've seen before - wheel flaps - while the second is an evolution of one of Audi's trademark technologies.
We last saw wheel flaps on the Ford Atlas Concept in 2013, but the futuristic fuel-saving tech has so far failed to arrive on a production car. Audi may be seeking to change that, patenting the flaps that open and close automagically based on airflow. They can also open if the brakes get too hot.
The second patent is an evolution of Audi's Quattro all-wheel drive. The new AWD system uses an electrically driven rear axle and wheel sensors to figure out when and at which corner the car might lose traction, and is targeted largely at hybrid offerings, which is a field Audi has only recently dipped its toe into.