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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.

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Range Rover versus Mercedes-Benz: Which makes a more appealing SUV?

From time to time — truth be told, all the time — the Autoblog staff enjoys a good debate on the merits and demerits of the cars and trucks we drive each week. This week, we spent some time in a brand-new Land Rover Range Rover Supercharged SUV, a model some of us think sits at the pinnacle of the luxury utility vehicle segment. Others disagree. The following is a real-life online debate that took place over the course of a few hours. Have a read, and feel free to take sides. There's a poll at the end so you can make your voice heard. Consumer Editor Jeremy Korzeniewski: Strange as it may sound, Jeremy Clarkson and I have a few things in common, most obvious of which is that we share a given name. But we also both love cars so much that we decided to turn our automotive passion into a career — with varying degrees of success, of course — and we both have come to realize over time that there's no point in trying to topple the Land Rover Range Rover as the world's best luxury off-road utility vehicle. Thing is, this universal truth isn't quite as universally shared as I think it should be. In fact, my esteemed colleague Alex Kierstein believes that Mercedes-Benz makes the most desirable four-wheel-drive off-road vehicles. He's clearly wrong, but I feel obligated to let him explain his choice, though it won't go without a rebuttal. Senior Editor Alex Kierstein: That's correct, and so am I in this regard. I'm sorry, Jeremy, but it's an irrefutable fact that Mercedes-Benz is doing the best interiors in the business now. And the interior is where you're going to spend most of your time, at least when the thing's running. The Range Rover's interior simply isn't as special, and frankly it'll be in the shop enough that you won't enjoy it. Now, stepping into pretty much any contemporary Mercedes sedan interior is a "wow" moment. They seem special — posh, exclusive, luxurious. The SUVs, all older vehicles coming due for total redesigns at some point in the future, are lagging a bit, but it's still a premium and upscale experience. Especially since performance is almost academic at this point. Anything in this class is going to be powerful, almost absurdly so. So why not go for the one that makes you feel like royalty, rather than your mechanic? JK: I just want to point out that it was you who brought reliability into this discussion.