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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.

Recharge Wrap-up: Honda Grace hybrid goes on sale in Japan, Daimler spends 100M euros on batteries

The Mercedes-Benz S-500 Plug-In Hybrid has earned an Environmental Certificate from the TUV Sud technical inspection authority. The award is based on a lifecycle assessment of the vehicle. This includes the ability to reduce CO2 emissions by 43 percent through charging, and by 56 percent if charged using hydroelectricity. Read more in the press release below. Daimler is expanding its production capacity for lithium-ion batteries. The company is investing around 100 million euros in its subsidiary Deutsche ACCUmotive, who will provide batteries for the electric Smart Fortwo and Forfour, as well as various Mercedes-Benz models. By the end of the construction, Deutsche ACCUmotive will have quadrupled production and logistics space since 2011. Read more in the press release below. Honda has begun sales of its Grace hybrid sedan in Japan. The Grace is based on the Honda Fit and uses the automaker's Sport Hybrid i-DCD system. It comes in front- and four-wheel-drive versions and uses a seven-speed DCT with built-in motor. The Honda Grace starts at the equivalent of about $16,500. Read more in the press release below. Honda has begun operation of its wind farm in Brazil. The farm consists of nine wind turbines, expected to produce about 95,000 MWh of electricity per year, which is on par with Honda's consumption for automobile production in the country. Honda is aiming to cut its CO2 production by 30 percent by 2020 compared to 2000 levels. Read more in the press release below. Toyota has won the 2014 World Endurance Championship's Driver and Manufacturer categories with hybrid technology. Toyota celebrated the win after the final race in Sao Paolo, Brazil. Toyota uses the same hybrid technology in its racing cars as it does in its production vehicles. Read more in the press release below. Controlled Power Technologies and other groups are calling for an international 48-volt electrical standard for vehicles. The groups called for the standard at the International Conference Automotive 48 V Power Supply Systems, saying that the 48V standard for mild hybrids would help make the systems more affordable. This will make it easier for automakers to meet the more stringent CO2 standards anticipated in coming years along with the introduction of the World Light vehicles Test Procedures. Read more at Green Car Congress. The world's first certified three-litre luxury saloon: S 500 PLUG-IN HYBRID receives Environmental Certificate Stuttgart.

Mercedes testing C-Class plug-in hybrid modes in Germany

Testing appears to be underway for what would be the first Mercedes-Benz C-Class with a hybrid powertrain. We can see a pair of the prototypes undergoing testing in Germany, with one, a C-Class Wagon, still heavily clad in camouflage and featuring a more noticeable outlet on the passenger side of its rear bumper.
There's also a more production-looking sedan, which features a not-so-discreet flap over its rear-bumper outlet. It's difficult to speculate on power outputs for this fuel-sipping C-Class, although our spies seem to think that this car will feature some combination of a four-cylinder gas engine with an electric motor, although just which four is unclear (note, we wouldn't mind if MB fit its 2.0-liter turbo with some batteries and motors). Regardless, the four-pot/electric motor seems like a pretty reasonable combo, although it probably means that Mercedes won't be challenging the six-cylinder-powered system of the BMW ActiveHybrid3 any time soon.
When the plug-in C-Class arrives later this year as a 2015 model, it will likely offer a full range of driving modes, including both gas or electric, only, as well as a more traditional hybrid mode.