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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.

Submit your questions for Autoblog Podcast #325 LIVE!

We're set to record Autoblog Podcast #325 tonight, and you can drop us your questions and comments via our Q&A module below. Subscribe to the Autoblog Podcast in iTunes if you haven't already done so, and if you want to take it all in live, tune in to our UStream (audio only) channel at 10:00 PM Eastern tonight.
Discussion Topics for Autoblog Podcast Episode #325
Twin-turbo Cadillac CTS coming

The 2016 Spanish Grand Prix flipped all the scripts

The Monaco Formula 1 Grand Prix circuit and the Hungaroring fly the flag for processional races, yet Spain's Circuit de Catalunya is arguably as bad. Before this weekend, the pole-sitter won the race 19 times out of the last 25 years. The front row of the grid produced 23 winners in the past 25 years. The racing gods edited that script this year, when a first-lap crash and two mid-race strategy changes kept things open until the end of the 66-lap race. It started when Mercedes-AMG Petronas teammates Nico Rosberg and Lewis Hamilton took each other out on Lap 1. After Rosberg passed pole-sitter Hamilton into Turn 1, Rosberg's car slowed through Turn 3, somehow in the wrong mode. Hamilton closed in on Rosberg so quickly that once the Brit ducked inside for the pass, he couldn't back out. Rosberg, however, closed the door so suddenly that Hamilton had no choice but to drive onto the grass. When Hamilton spun, he collected Rosberg and both Mercedes' ended up in the gravel trap. The stewards deemed it a racing incident. The crash put Red Bull teammates Daniel Ricciardo and Max Verstappen in the lead, followed by Toro Rosso driver Carlos Sainz and the Ferrari duo of Sebastian Vettel and Kimi Raikkonen. Both Ferraris cleared Sainz by Lap 10, leaving 56 laps for them to haul in the Red Bulls. Ferrari loosely followed Red Bull's pit strategies. Ricciardo pitted on Laps 11 and 28, Vettel pitted on Laps 15 and 37. Verstappen pitted on Laps 12 and 35, Raikkonen pitted on Laps 13 and 36. Pirelli predicted a three-stop race as the fastest and that the medium tire could only go about 23 laps. Verstappen and Raikkonen didn't get those memos. So while Ricciardo and Vettel came in for third stops the Dutchman and the Finn stayed out, with Verstappen ahead of Raikkonen at the front of the race as of Lap 43. That's when Verstappen – 18 years and 227 days old – proved how good a driver he is, lapping perfectly as second-place Raikkonen closed the gap to a little more than half a second. The Finn still couldn't get past the Dutchman down the pit straight even with the help of DRS, nor under braking at the only real passing opportunity into Turn 1. At the end of Lap 66 Verstappen crossed the line ahead of Raikkonen, a victorious end to Verstappen's first race weekend after being promoted to Red Bull. Further back, Vettel and Ricciardo fought for scraps, the German staying ahead to finish third.