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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.

2016 Mercedes-Benz C350 Plug-In Hybrid on sale this fall

The Mercedes-Benz C350 Plug-In Hybrid can go from 0 to 60 miles per hour in less than six seconds and can travel 20 miles in all-electric range. As for the more practical issues related to the new PHEV, well, those details will have to wait a bit longer. The C350 Plug-In Hybrid makes its official debut at the Detroit Auto Show this week. The electrified Mercedes will start US sales this fall as a 2016 model. The sedan's four-cylinder, 1.9-liter, turbocharged gasoline engine will be paired with an electric motor that will deliver a combined 275 horsepower. The car will also have such goodies as regenerative braking and collision-avoidance systems, not to mention a top speed of 130 mph. We're still waiting for the car's estimated fuel economy, of course. Not to mention its sticker price. Spy shots of the C-Class PHEV started popping up in May, as well as reports that the Daimler division was testing prototypes in Germany. Meanwhile, this past summer, Mercedes-Benz started taking payments for the S500 Plug-In Hybrid, the German automaker's first production plug-in vehicle. That model, which started European deliveries last September, can zip from 0 to 60 in about five seconds. It also costs about $146,000.

Autoblog drives to the Arctic Circle

In Which Mercedes' Sprinter Becomes A Long-Distance Sherpa
In the wintery wilds of northern Alaska, even the cute little critters want to kill you.
As I am about to nod off on my long leg flight from Minneapolis to Anchorage ahead of driving to the Arctic Circle, the friendly twenty-something Alaskan knitting furiously in the seat next to me pauses and says, "When you're driving up there, don't open your windows." In the dead of winter? I hadn't planned on cruising alfresco, but her warning to keep the glazing snugged against the weatherstripping is one I would take to heart. She continues: "If you leave 'em open, a fox is liable to jump right in. There are lots of rabid foxes up there, and they leap into your car and just Go. To. Town." And here I was, thinking that a curious bear or maybe an ill-placed moose in the road was going to be my biggest potential four-legged threat. In the wintery wilds of northern Alaska, even the cute little critters want to kill you.