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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 chief marketer admits ELR is 'a big disappointment'

During the Cadillac XT5 global launch in Dubai, Automobile interviewed Cadillac Chief Marketing Officer Uwe Ellinghaus and got the CMO to touch on just about every major issue affecting the brand and the industry. After two years on the job, having come from 15 years at BMW, Ellinghaus naturally started with the "passionate Cadillac customers" and "iconic brand" spiel, then they got into a top-down look at where America's preeminent luxury brand stands. Ellinghaus said Cadillac is in a period of transition, lately focused on smaller and more performance-oriented vehicles, which has alienated a chunk of veteran customers and left others trying to figure out what Cadillac is about. He believes that "for a few more years, the products will probably be stronger than the brand," while he does his work of conveying what the company has to offer. But the brand had to make the switch, because "Generation X and Y will make 80 percent of all actual buyers in the next five years..." On top of that, he'll be working on making sure the customer and dealership experiences are where they need to be. Speaking of dealers, Ellinghaus thinks the future will not be brick-and-mortar shops, but digital pickup-and-delivery services. "Nobody wants to go to a dealership for service and maintenance," he says. He said the ELR has been "a big disappointment," but it has taught Cadillac that converting its existing line-up to plug-in hybrids is a better way forward. However, he characterized the plug-in hybrid as "the next all-wheel drive," in that everyone's going to offer it soon, so it will be "an entry ticket into luxury automobiles rather than a differentiating aspect." The CMO thinks the CTS is suffering because of the decline in the US midsize luxury sedan market in general thanks to the SUV and crossover craze, so the brand really needs another small SUV. Head over to Automobile for more of Ellinghaus' intriguing answers, like "I do believe that very long-term hydrogen is really the way," and "it's time to get real" in Europe. Taking a dig at Volkswagen on that last matter, he also said, "I think the absence of the diesel is not as much of an issue as it was eight weeks ago." Related Video:

Cadillac developing stretched ATS-L just for China

To luxury automakers, long-wheelbase sedans are to China that crossovers and SUVs are to the US, so it isn't all that surprising any more when the latest sedan gets an extra couple of inches between the wheels to improve rear-seat comfort. According to Car News China, the next sedan to get the stretch will be the Cadillac ATS, which will increase the wheelbase by 10 centimeters (about four inches) to become the ATS-L.
Designed to go up against rivals like the BMW 335Li and the added-length Mercedes C-Class, the ATS-L will reportedly be built locally in China with an engine list that will grow as well. Currently, only the 2.0-liter turbo engine is offered in the ATS in China, but the ATS-L will get the full spectrum of ATS engines including the base 2.5-liter and the peppier 3.6-liter V6. This isn't the first time Cadillac has offered a China-specific stretched sedan either as the SLS dates back to 2006.