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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.

VW joins Daimler's protest of new A/C refrigerant as EU deadline for compliance passes

The case of Dupont and Honeywell's refrigerant R-1234yf is doing the exact opposite of keeping things cool. The two chemical companies have spent years and hundreds of millions of dollars developing R-1234yf to replace R-134a, the new refrigerant shown to be 99.7-percent kinder to the environment than the one it is meant to succeed. Part of that development has been years of testing by governments, outside safety agencies and automakers to approve the chemical for use in cars. It passed the protocols necessary for the European Union to declare that new and significantly revised cars from 2013 onward needed to use R-1234yf, and mandated that every car as of 2017 must use it.
Enter Daimler AG. The automaker created a head-on collision test with a B-Class at their Sindelfingen test track that would lead to the pressurized refrigerant being sprayed on the engine. The result in 20 out of 20 test was that the refrigerant burst into flames as soon as it hit the hot engine, while Daimler says that R-134a does not catch fire in the same test. Another unexpected result of the R-1234yf test was the release of hydrogen flouride, a chemical far more deadly to humans than hydrogen cyanide, emitted in such amounts that it that turned the windshield white as it began to eat into the glass.
Said a Daimler engineer in a Reuters piece, "It was scarcely believable. The most complicated lab tests conducted using the most sensitive measuring instruments around found nothing and all we do is drive a car around a couple of times, open a tiny hole in the refrigerant line and the next thing you know the car is on fire." So Daimler said it wouldn't use the refrigerant, and it recalled the cars it had already shipped with R-1234yf.

Eight Mercedes Fuso Canter E-Cell trucks now in service

Portugal is far better known for its scenery and seascapes (not to mention some of its alcoholic beverages) than its place as a vehicle-testing center. But the European country is serving just that purpose for Daimler's Mercedes-Benz division and a new line of trucks. And they are of the battery-electric variety. Daimler has sent eight of its Mercedes-Benz Fuso Canter E-Cell battery-electric trucks for customer-trial purposes to various parts of the Western European country. And these customers include the Portuguese cities of Lisbon, Porto and Abrantes as well as delivery company Transporta. These entities will be testing trucks that have about a 60-mile single-charge range and deliver 150 horsepower. The trials for the trucks, which have 14-foot beds, will last one year. Daimler hasn't released a whole lot of details on further development or sales possibilities of the model. The hybrid version of the Fuso Canter debuted in the fall of 2009 and was under the Mitsubishi badge at the time, even though it was 85-percent owned by Daimler. That model is said to boost fuel economy relative to conventionally-powered trucks by as much as 23 percent. Take a look at Daimler's press release on the Fuso Canter E-Cell and its Portugal testing below. Zero emission and quiet as a whisper: eight new Fuso Canter E-Cell in customer trials Eight Fuso Canter E-Cell in real-life testing with customers for a year Locally emission-free and virtually noiseless Powerful, high-torque electric motor Battery capacity ensures range of more than 100 km Highlight of anniversary year for the Canter assembly plant in Tramagal, Portugal The drive system to suit: Canter Euro VI, Canter Eco Hybrid and Canter E-Cell The cleanest technology, whatever the application: Fuso is a pioneer of "green" drive systems in the commercial vehicle sector. The Daimler subsidiary in Japan is the home of Daimler Trucks' centre of competence for hybrid technology, and with this experience behind it, Fuso has also been responsible for developing the new battery-electric-powered "Zero Emission" Canter E-Cell. The first all-electric light-duty truck, produced in a small series, runs emission-free and almost silently. The Canter E-Cell for Europe is manufactured at the Tramagal plant in Portugal. Eight vehicles have now been released for customer trials.