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GM patent reveals new two-stage turbocharger

Modern turbochargers may be some of the best ever made, but performance is something that engineers are always trying to improve. According to GM Inside News, General Motors (GM) is hoping to alleviate some of the negative aspects of a two-stage turbocharger setup with a newly-patented design. The patent, that was filed on May 19, 2016, reveals a clever bypass system that allows the engine, a four-cylinder unit, to optimize both the low-pressure and high-pressure inlets for its respective functions. According to the filing, a conventional two-stage turbocharger setup is engineered to allow both turbines to operate simultaneously at low and mid engine speeds. At high engine speeds, only the low-pressure turbine works. The setup can't isolate either the low or high pressure side, which can impair low-end performance. GM's new two-stage turbocharger setup looks to eliminate this by linking the high-pressure turbo to the exhaust manifold through the high-pressure inlet duct. The low-pressure turbo is attached to the high-pressure turbo by a low-pressure inlet duct, which is linked to a connecting channel. A single actuator that is housed in the exhaust manifold creates a bypass that can opens the high-pressure inlet or close the connecting channel. Depending on what the engine load and speed is, the ECU guides the actuator—a single rotating spindle with discs corresponding to flanges on the high and low pressure sides—to isolate one of the two turbos. Isolating the turbos allow the respective inlets to be engineered for the best possible fluid dynamic performance. The setup should increase performance and decrease lag. There's no word on what car this setup will make an appearance on, but it will most likely be used in premium vehicles before trickling down to the rest of GM's vehicles. Related Video: News Source: GM Inside News, AutoGuide via GM Authority Cadillac Chevrolet GM Technology Sedan turbo patent engine turbocharging

Cadillac CT6 to be lighter than CTS, get PHEV model

Cadillac is suddenly one of the most talked about automakers in the US with Johan de Nysschen taking control. The brand claims that it eventually wants to become, once again, the standard of the world. One of the first vehicles to actually prove whether that's possible is its upcoming CT6 flagship sedan. We still don't know what the production version looks like undisguised, but other important details are falling into place. The latest big news sheds some light on the Caddy's powertrain and some estimates of its weight and size.
General Motors product chief Mark Reuss dropped the details at the automaker's Global Business Conference. According to The Detroit News, he revealed that the CT6 would use a twin-turbocharged, 3.0-liter six-cylinder engine with an eight-speed automatic transmission, and a plug-in hybrid would be an additional option. He reportedly claimed it would be the most "powerful six-cylinder gas engine in the segment" and said the hybrid could get around 70 miles per gallon.
Reuss also revealed that the CT6 would be about 53 pounds lighter than the current CTS, despite being about 8 inches longer, according to The Detroit News. If that's the case, the new flagship is about 203.5-inches long, which is 1.5-inches more than the XTS.

Cadillac ELR regen on demand brakes win 2014 Green Car Technology award

Just like the Oscars, Green Car Journal decided a few years ago to up the number of nominees for its annual award. For the annual "Green Car of the Year" award, given out at the Los Angeles Auto Show each year, there are five finalists. For the "Green Car Technology" award, there are a fantastic ten. At the 2014 Washington Auto Show today, the Cadillac ELR and its regen on demand brakes managed to beat out the nine other finalists to claim the second annual "Green Car Technology" award. What is the purpose of the "Green Car Technology" award? Green Car Journal says it wants to reward "technologies that enable significantly improved environmental performance in vehicles today," which is why only fuel-saving technologies that were "in use on American highways during the award year" can be considered. The Caddy's brakes beat out the Acura Sport Hybrid SH-AWD powertrain, the Audi 3.0-liter turbodiesel engine, the BMW carbon-fiber passenger shell from the i3, the 1.0-liter EcoBoost engine used by Ford, the plug-in hybrid powertrain in the Honda Accord, Hyundai's hydrogen fuel cell technology, the regenerative brakes in the Mazda i-ELOOP, the plug-in hybrid powertrain used in some Porsche models and, finally, the Ram 3.0-Liter EcoDiesel engine. Last year, Green Car Journal gave Mazda's Skyactiv technology the inaugural Green Car Technology award. Cadillac ELR Regen On Demand Wins 2014 Green Car Technology Award Green Car Journal Lauds Cadillac's Electric Car Tech at Washington Auto Show WASHINGTON, Jan. 22, 2014 /PRNewswire/ -- Cadillac's innovative Regen on Demand technology has taken top honors as the winner of Green Car Journal's 2014 Green Car Technology Award™. The prestigious award was presented at a Green Car Journal press conference during the Washington Auto Show's second Policy Day. "Cadillac has cleverly evolved a common electric-drive efficiency system into an intriguing feature that adds a new dimension to the driving experience," said Ron Cogan, editor and publisher of Green Car Journal and CarsOfChange.com. "Ever-increasing efficiency is crucial to our driving future, yet efficiency itself is not an attraction for a great many car buyers.