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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

Chevy gets cracking on Cruze EV fleet testing

Chevrolet Cruze EV - Click above for high-res image gallery
The Chevrolet Volt hasn't yet gone on sale, but General Motors is looking at ways of expanding its electric vehicle lineup. Chevy, along with partner LG, is employing a group of all-electric cars in the form of the Cruze. The sedans are part of a demonstration fleet which is located in Seoul, South Korea and is being used to provide data in an electric vehicle research project. The goal is to gather information on driving patterns and charging behavior in addition to consumer acceptance.
The Cruze EVs, along with some Daewoo Lacetti Premieres EVs, are the first fleet of full-size electric vehicles and should provide invaluable information for The General. Staying full-size means not sacrificing cargo space, so the battery pack is mounted to the underbody, leaving the trunk area open for plenty recyclable, canvas grocery bags.

Chevy Sail 3 lands in China

Shanghai General Motors took 32 cars to this year's Guangzhou Motor Show, with its Chevrolet Sail 3 leading the way. After putting almost 1.4 million of them into Chinese hands, the third generation of the Bowtie's entry-level sedan wants to "take the nameplate and the segment to a new level." Its new architecture sporting a 1.4-inch longer wheelbase supports a growth spurt of two inches in length and 1.8 inches in width. The exterior also gets "eagle eye-shaped" headlights and "dual-c-element taillights." Under the hood will be either a 1.5-liter DVVT or a 1.3-liter VVT, each of them more powerful and more frugal than previous offerings. Both can be paired with a manual or an automatic transmission, and qualify for listing in China's National Energy-Saving and Eco-Friendly Vehicle Catalogue, as well as a 3,000 renminbi rebate ($490 US). You can read more about it in the press release below, and get more info on the Chevrolet Camaro RS Limited Edition, Corvette Stingray Coupe, Buick Regal GS and Excelle XT also introduced at the show. Chevrolet, Buick and Cadillac Take Center Stage at Guangzhou Auto Show - New Chevrolet Sail 3, Camaro RS Limited Edition and Corvette Stingray Coupe make China debut - Buick showcases customized Regal GS and Excelle XT - Shanghai GM announces new telematics strategy featured in upcoming Cadillac product GUANGZHOU, 2014-11-20 – Shanghai GM is displaying 32 vehicles from the Chevrolet, Buick and Cadillac brands at the 12th Guangzhou International Auto Show, which begins today and runs through November 29 in Guangzhou. Among the products that are making their China debut are the third-generation Chevrolet Sail 3, Chevrolet Camaro RS Limited Edition and Chevrolet Corvette Stingray Coupe. In addition, Buick is showcasing a customized Regal GS and Excelle XT, and Shanghai GM is announcing its new telematics strategy that will be featured in an upcoming Cadillac product next year. Chevrolet Sail 3 Entry-Level Family Car Since its introduction 15 years ago, the Sail has been a driving force in the entry-level family car segment. Nearly 1.4 million Sails have been sold across China. The third-generation Chevrolet Sail, named the Sail 3, will take the nameplate and the segment to a new level when it goes on sale nationwide by the end of this year. Built on Shanghai GM's new-generation small car architecture, the Sail 3 has adopted Chevrolet's new design language. It has a sculpted yet slim exterior with a youthful, dynamic feel.