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Mercedes-Benz engines with 48-volt systems coming in 2017

As part of a big green push announced yesterday, Mercedes-Benz is jumping into the world of 48-volt power. The company will launch a new family of efficient gasoline engines next year and will begin rolling out 48-volt systems with it, likely in its more expensive cars first. Mercedes will use the 48-volt systems to power mild-hybrid functions like energy recuperation (commonly called brake regeneration), engine stop-start, electric boost, and even moving a car from a stop on electric power alone. These features will be enabled through either an integrated starter-generator (Mercedes abbreviates it ISG) or a belt-driven generator (RSG). (RSG is from the German word for belt-driven generator, Riemenstartergeneratoren. That's your language lesson for the day.) Mercedes didn't offer many other details on the new family of engines. There are 48-volt systems already in production; Audi's three-compressor SQ7 engine uses an electric supercharger run by a 48-volt system, and there's a new SQ5 diesel on the horizon that will use a similar setup with the medium-voltage system. Electric superchargers require a lot of juice, which can be fed by either a supercapacitor or batteries in a 48-volt system. Why 48-volt Matters: Current hybrid and battery-electric vehicles make use of very high voltages in their batteries, motors, and the wiring that connects them, usually around 200 to 600 volts. The high voltage gives them enough power to move a big vehicle, but it also creates safety issues. The way to mitigate those safety issues is with added equipment, and that increases both cost and weight. You can see where this is going. By switching to a 48-volt system, the high-voltage issues go away and the electrical architecture benefits from four times the voltage of a normal vehicle system and uses the same current, providing four times the power. The electrical architecture will cost more than a 12-volt system but less than the complex and more dangerous systems in current electrified vehicles. The added cost makes sense now because automakers are running out of ways to wisely spend money for efficiency gains. Cars can retain a cheaper 12-volt battery for lower-power accessories and run the high-draw systems on the 48-volt circuit. The industry is moving toward 48-volt power, with the SAE working on a standard for the systems and Delphi claiming a 10-percent increase in fuel economy for cars that make the switch.

Aston wants to build DBX on its new platform, not Mercedes'

Aston Martin is proceeding with plans to launch the DBX as its first production crossover. It just can't say at this point what it will be based on. Speaking with Automotive News Europe, Aston's new CEO Andy Palmer indicated that basing the DBX on a Mercedes SUV platform would not be its first choice because they "clearly sit in a very different space to the one we want to go" with the DBX. Instead, the company's first choice would be to build the crossover atop the new platform it's developing for its sports cars. "It just depends how high off the ground it could go," said Palmer. "I don't exclude the possibility of using some [Mercedes] parts, but I would say very much the primary route is our platform." The prospect of building an Aston SUV on Mercedes architecture – namely that of the GL-Class – has been on the table for some time now. The Lagonda SUV concept it showcased at the Geneva show in 2009 was based on the GL, and the two automakers have been forging a tightening alliance in the years since. The British automaker's next-generation engine is to be built by Mercedes-AMG, and it is expected to source other components from the German automaker as well. For its part, Mercedes has been taking a sportier approach with its latest crossovers, as demonstrated by the GLE Coupe that debuted before the more conventional version and the Concept GLC Coupe that previewed the GLK's replacement in Shanghai last month. Aston Martin, on the other hand, is building a new sports car platform that will underpin its next generation of luxury GTs, replacing the long-serving VH architecture that has served for decades as the basis for its entire model line. Perhaps the most surprising of ANE's report, though, is that Aston seems to be proceeding with plans to build the DBX apparently without even knowing what platform it will use.

Consumer Reports declares most and least loved cars [w/video]

Consumer Reports is crunching the numbers from its annual owner-satisfaction survey, and part of that process is finding out how attached drivers are to their cars. CR simply asks readers of models up to three years old if they would buy the same vehicle again in light of their entire ownership experience, and tallies the results. After looking at the responses for about 350,000 vehicles, it turns out that people really love a certain California-built, electrically powered luxury sedan. That's right, this year's the overall winner was the Tesla Model S with a whopping 98 percent of owners saying they would purchase another one (the Model S also won this award last year, with 99 percent satisfaction). The Chevrolet Corvette Stingray came in a close second with 95 percent of drivers hoping to park another one in their garage. A few models weren't quite so favored, though. The Nissan Versa Sedan was the least loved model among its owners; a mere 42 percent said that they would purchase another. The aging Jeep Compass didn't do much better, with just 43 percent of drivers willing to buy the softroader again. On average, about 70 percent of owners say they would buy their car again, and only four cars ranked below 50 percent in CR's findings. Check out the video above to see some of the winners and losers in a few of CR's categories. If you're a subscriber, you can check out the full list on its website. Related Gallery Consumer Reports Most Loved Cars 2014 Related Gallery Consumer Reports Least Loved Cars 2014 News Source: Consumer Reports - sub. req., Consumer Reports via YouTube Chevrolet Ford Mazda Mercedes-Benz Porsche Subaru Tesla Ownership Videos car ownership