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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.

Mercedes forced to lower MPG ratings on two C300 models *UPDATE

*UPDATE: Donna Boland, manager of corporate communications at Mercedes Benz USA, told AutoblogGreen that the sticker change only applied to around 500 C-Class vehicles on dealer lots, since a new C-Class came out in late August. "About 500 are left in the United States, and we've relabeled them," she said. First Hyundai, then Ford and now Mercedes-Benz. The list of companies that have had to change their vehicles' official EPA fuel economy ratings has just grown by one with the announcement that the 2013 and 2014 C300 4-Matic FFV and PZEV versions need to have their EPA labels adjusted. The changes aren't massive, at most one mile per gallon. The changes aren't massive, at most one mile per gallon, but they are lower than before. The FFV version goes from 20 to 19 mpg in the city while the PZEV drops one mpg across the board from 23/20/29 combined/city/highway) to 22/19/28. The FFV's combined (22) and highway (27) ratings stay the same. Other Mercedes vehicles that were spot checked turned out to have accurate labels. The problem, which is reminiscent of the issues that Ford had with the Total Road Load Horsepower, was that "Mercedes underestimated the impact of aerodynamic drag and tire rolling resistance known as 'road-load,'" the EPA said in a statement you can read below. We have asked Mercedes for more information on the issue but have not yet heard back. We're not sure how many vehicles the EPA is retesting (or asking to be retested), but the agency says that the C300 models were evaluated again by Mercedes "with EPA oversight" and the EPA did its own tests at the National Vehicle and Fuel Emissions Laboratory in Ann Arbor, MI. Christopher Grundler, the director of EPA's Office of Transportation and Air Quality, said that the EPA knows that the changes are minimal, but that, "it is important that our oversight system is producing the correct results because even one MPG matters to consumers." In case you need a primer in the recent history of companies adjusting their EPA numbers, check out this and this. Based on today's news, we won't be surprised to hear more changes are coming. EPA Requires Mercedes-Benz to Correct Fuel Economy Labels for Two C300 4-Matic Vehicles WASHINGTON - The U.S. Environmental Protection Agency (EPA) is revising estimates for two 2013/2014 Mercedes C300 4-matic vehicles, the FFV and PZEV, to ensure consumers are given accurate fuel economy values.

Autoblog's adventures at the Nurburgring 24-Hour race [spoilers]

The brand-new Audi R8 LMS, said to share 50 percent of its components with the street-legal R8 shown off at Geneva, has won its very first race at the 2015 Nurburgring 24-Hours. The No. 28 car driven by Christopher Mies, Edward Sandstrom, Nico Muller, and Laurens Vanthoor for the Audi Sport WRT team out of Belgium finished only 40.279 seconds ahead of the No. 25 BMW Sport Team Marc VDS Z4 GT3 in second place, for the smallest winning gap since the race began in 1970. Those two cars traded the lead throughout Sunday morning and were less than a minute away from one another for the last two hours. They were part of a total 35 lead changes during the entire race – a record for the event – and both did 156 laps. Third place went to the No. 44 Falken Tire Porsche 997 GT3, one lap down. The Audis did what they always do: lurked close to the front, stayed out of trouble, then pounced when everyone else faltered. For the opening stretches the BMW Z4 teams owned it, running 1-2-3 for a while, but all of them hit trouble. When morning came and the race got over its yellow-flag fever, the No. 28 Audi was in front and stayed there. It was the third Nurburgring 24-Hour win for Audi in four years, the brand's first win only coming in 2012. Last year's winner, the Phoenix Audi team that set a race record by doing 159 laps, had both of its cars retire. One hit an oil patch about 12 hours in, spun and was hit by another car behind, taking on too much damage to continue. The other retired with engine issues. Other Notes Three cars crashed out of the race while leading, after the rains that weren't supposed to happen, happened about 90 minutes in. The No. 20 Schubert BMW Z4 led the first 50 minutes of the race, hopped a crest at Pflanzgarten, landed in a pool of water, and hit the wall on the 30th lap. Then the No. 30 Frikadelli Porsche, with a driver team that included ex-'Ring Taxi driver Sabine Schmitz, hit the No. 31 Mercedes SLS AMG GT3 on the approach to Carrousel and crashed out. Then the No. 1 Phoenix Audi, last year's winning car, took the lead but hit the wall after that oil patch near Pflanzgarten and was out of the race. Aston Martin celebrated a class win in the SP8 category with the No. 49 Vantage GT4 N430. This being the tenth anniversary of the Vantage running the Nurburgring-24, this year's car was painted in the same colors as the racecar from ten years ago.