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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 LTS flagship to bow at NY Auto Show

There is widespread agreement across the industry that Cadillac needs a proper, rear-drive flagship sedan that completes legitimately with the Mercedes-Benz S-Class, Audi A8 and BMW 7 Series.
Fortunately, the same view is held within the company, and just such a car - possibly dubbed LTS - is under development. According to a high-level source at Cadillac, the new four-door, which is said to incorporate design cues from the marque's celebrated Elmiraj coupe concept, will debut at the New York Auto Show next April.
If the car needs a cheerleader, surely incoming president Johan de Nysschen is just such a person. De Nysschen doesn't arrive at Cadillac until late in the month, but certainly he will want a proper flagship to do battle with his old foes at Mercedes-Benz and BMW and old friends at Audi and Infiniti.

Cadillac boss says small SUV 'at least four years away'

Since Johan de Nysschen's takeover as brand president, there's a lot of buzz around Cadillac. Now, the brand's leader is now giving a little more clarity about when we might see some of the company's future vehicles, including its compact crossover. "Product development life cycles being what they are, I don't have a date in mind but I would estimate it is at least four years away," said de Nysschen about a small Cadillac CUV. The comments were made to Reuters during the Washington Auto Show. The vehicle is part of Cadillac's eight-model, $12 billion reinvention through 2020. Interestingly, de Nysschen told Autoblog at the 2015 Detroit Auto Show that he estimated the compact luxury CUV to arrive by early 2018. The boss also indicated that Cadillac would get a sedan to slot below the ATS some time in 2017, and the previously spied SRX replacement, possibly called the XT5, would debut in 2016. In the meantime, the company's flagship CT6 is being unveiled at the 2015 New York Auto Show in April. The wait for a luxury compact CUV makes Cadillac one of the later entries into the segment. The space is already filling with vehicles like the BMW X1, Audi Q3, Mercedes-Benz GLA-Class, Lexus NX and Lincoln MKC. Small crossovers in general seem to still be growing in sales. While building a better brand in the US, de Nysschen also wants to grow Cadillac in Europe in the future. He told Reuters that he wants diesel vehicles ready for 2019 to appeal to customers there. Some might even be offered in the US. News Source: ReutersImage Credit: Scott Olson / Getty Images Design/Style Cadillac Crossover Diesel Vehicles Luxury de nysschen