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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

Coronavirus blues, and the 2021 Hyundai Elantra debuts | Autoblog Podcast #619

In this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Senior Editor, Green, John Beltz Snyder and News Editor Joel Stocksdale. Get a behind-the-scenes look at life for Autobloggers during the coronavirus outbreak, as they talk about how it's not only affecting the automotive industry at large, but the people who cover it as well. Amidst the chaos, Hyundai unveiled the 2021 Elantra, and out editors opine about the new small sedan. They briefly discuss what cars they'd want to drive cross-country if they had a flight that had been canceled, before talking about the cars they've actually been driving, including the Mercedes-Benz GLS 580, Jeep Renegade and Lincoln Corsair. Finally, they reach into the mailbag and help a listener pick a new car. Autoblog Podcast #619 Get The Podcast iTunes – Subscribe to the Autoblog Podcast in iTunes RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown The coronavirus is affecting the auto industry, and those who obsessively cover it 2021 Hyundai Elantra has been revealed Poll: Your flight's canceled. What car do you drive cross-country? 2020 Chevy Corvette orders end Cars we're driving: 2020 Mercedes-Benz GLS 580 2020 Jeep Renegade 2020 Lincoln Corsair Spend My Money Feedback Email – Podcast@Autoblog.com Review the show on iTunes Related Video:

2015 Chevrolet Cruze spied on its home turf

The next Chevrolet Cruze isn't set to go into production for about another year, and we're just now seeing prototypes of the new compact running around here in the States. Not much more has been revealed since we saw the car blasting through the snow in Europe, but we can still clearly see new design elements like the larger grille, slimmer headlamps and redesigned taillamps.
Our spy photographers worked up a composite image of this Cruze prototype alongside the current model, and here, we can clearly see some big visual changes are in store for the new model. The 2015 Cruze's hood slopes downward more dramatically, the windshield is more heavily raked, and the roofline looks more fluid overall. The next-generation Cruze will ride on the new global Delta platform that will also underpin other General Motors vehicles like the Chevrolet Volt and Equinox.
As for what's under the hood, we expect the normal range of gasoline four-cylinder engines (both naturally aspirated and turbocharged), and the compact's new turbodiesel four should carry over, as well. Have a look at the full brace of spy photos in the gallery above.