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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 Alabama ops ordered to allow workers to discuss unionization

A decision last week by the National Labor Relations Board has bolstered the efforts of the United Auto Workers at Mercedes-Benz's Tuscaloosa, AL factory, as the union continues its attempts to represent the factory's workers. According to Reuters, the NLRB ruled that Mercedes-Benz US International, the proper name of the company behind the Tuscaloosa factory, can no longer prevent workers from discussing unionization in work areas while off the clock. While MBUSI maintains that it's not taking a side on unionization and that it wants the "the decision left to our team members," the UAW is still arguing that the US facility should take the same position on unions that the rest the world's Mercedes-Benz plants take and. Speaking to Reuters, the UAW says that stance "acknowledges the human right to form trade unions" and "respects the right of collective bargaining." According to Reuters, the Alabama factory employs 3,500 workers – 2,500 full time and 1,000 "temporary" – and is the only Daimler-owned factory on the planet not to offer employees the opportunity for representation. Presently, the Tuscaloosa facility assembles Mercedes' C-Class, GL-Class and M-Class vehicles.

Mercedes C-Class Coupe due to go on sale next December

While we expect to see the coming Mercedes C-Class convertible sometime next year, perhaps at the Paris Motor Show, Auto Motor und Sport reports that the C-Class Coupe will go on sale in December 2015 (probably in Europe first) - it's possible we'll see it debuted at the same time as the cabrio. The German magazine says the two-door will have sharper lines on a body that is four inches longer, almost two inches wider and a fraction of an inch lower than the sedan, dimensional aggrandizement that will be put to good effect on the AMG version coming in 2016. We'll have to wait for information on powertrains, which should hew to the sedan's lineup in addition to whatever else M-B might bring over here, topped off by the 503-horsepower, twin-turbo V8 in the AMG variant. Speaking of which, the 'last-generation' C63 AMG Coupe is still on sale until spring of next year, if you're a fan of the classics. Or you can wait on news of the C-Class four-door coupe, if niches inside of niches are what you're really after.