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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

2018 Cadillac XT7 three-row crossover spied [UPDATE]

UPDATE: Upon further consideration, and after speaking to some industry insiders, it appears this might not actually be a new Cadillac, but instead just a mule of the new Chevy Traverse. One source points out that the foglights are fixed, round units, which would be production spec and would not suggest Cadillac. Another source says the Cadillac version of the Traverse/Acadia/Enclave was cancelled, and development has stopped. Yes, a Cadillac of this size is expected to arrive – and elements of this prototype sure do look Cadillac to us – but it might be too early for this to be it. Cadillac is expanding its portfolio with a three-row crossover. This is it. Expected to be called the XT7, the new vehicle will give Cadillac an entry above the XT5 and below the hulking Escalade. Though the XT7 is heavily covered, we can see Cadillac's (?) bold grille and what looks like strong proportions. It'll probably look like a larger XT5, and you can sort of (maybe) see a similar roofline if you squint. Spy shooters caught it testing with the new Chevy Traverse and Buick Enclave, and they're all expected to use the new General Motors 3.6-liter V6 engine, like the recently revealed GMC Acadia. The XT7 could show up as soon as late this year or early in 2017. Its part of GM's push to capitalize on the red-hot crossover segment that has been fueled by low gas prices and Americans' thirst for utility. The XT7 would likely represent GM's most profitable play in this segment. Simply affixing the Cadillac badge on the front adds thousands of dollars to the sticker compared to a Chevy or Buick product. The XT7 will also give Cadillac a significant opportunity for growth – and perhaps allow it to gain on Mercedes and BMW on the sales charts. While the CTS and ATS have had mixed success, Americans have continued to show a willingness to buy Cadillac utility vehicles. The XT7 is the latest in Cadillac's product blitz following the XT5 and the CT6 range-topping sedan. Those two are the most critical Caddys, but the XT7 isn't far off. Related Video: Featured Gallery 2018 Cadillac XT7 View 11 Photos Image Credit: Brian Williams / SpiedBilde Spy Photos Cadillac SUV

Cadillac president de Nysschen says electrification coming 'across the spectrum'

We like to pick on new Cadillac president Johan de Nysschen for his insistence, many years ago, when he was president of Audi of America, that plug-in vehicles are for idiots. Listening to him give the keynote address at the Washington Auto Show today, you wouldn't know he ever said anything negative about an electric vehicle. Instead, he sounds something like a EV-angelist. De Nysschen said that Cadillac will be able to benefit from GM's considerable expertise in plug-in technology, which he said would be "applied across the spectrum of our portfolio." GM's electric committment will help in "making electrification commonplace." With the plug-in ELR already on the road, de Nysschen said that the company's next step in advancing powertrains will be the introduction of stop/start technology – which de Nysschen called an "important system to reduce fuel consumption and CO2 emissions" – into a Cadillac for the first time later this year. Without giving any specific details, de Nysschen said that Cadillac will introduce eight new models (not necessarily plug-ins) by the end of this decade, including five that "will take Cadillac into market segments where the brand is not even present today." These new vehicles will likely be much lighter than today's vehicles, de Nysschen said, because "weight reduction today is critical to automotive design, it helps to improve fuel efficiency and contributes to desireable vehicle dynamics." The key is to reduce weight without compromising safety or comfort and to use the right material – steel, aluminum, carbon fiber – in the right place at the right time. It was a not-so-subtle jab at Ford and its new aluminum F-150. "In the pursuit of weight reduction, some manufacturers have also opted for abandoning steel and have gone for an all-aluminum approach," he said. "At Cadillac, we believe that different materials each present particular advantages in specific applications. There is no single material that represents the optimum balance of the conflicting objectives of every single application." Related video: