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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

GM's labor deal with UAW union on verge of ratification

Nov 15 (Reuters) - General Motors' tentative labor deal with the United Auto Workers (UAW) union closed in on ratification as the votes were counted on Wednesday. Following the approval earlier in the day by more than 60% of union members at the Detroit automaker's large Arlington, Texas, assembly plant, additional votes in favor have the deal close to clinching majority approval. The number of union locals, most of which are smaller, still to report vote totals is not large. After several large assembly plants voted against the deal earlier on Wednesday, some media had reported the deal was heading toward failure. But Arlington's support, followed by strong voting in favor by smaller warehouse and parts facilities, has put the deal on the brink of approval. This would mark the first ratification of a deal, which runs through April 2028, with one of the Detroit Three automakers. Ford and Stellantis voting is still under way, and workers at both companies were favoring ratification by comfortable margins. The UAW's GM vote tracking site currently shows approval of the contract leading by a 54% to 46% margin with almost 32,000 workers having cast votes out of about 46,000 UAW-represented GM workers. The Arlington plant, with about 5,000 UAW members, has the most of any GM plant. Voting officially ends on Thursday at 4 p.m. EST, although most votes will be cast on Wednesday. The UAW went on strike for more than six weeks against the Detroit Three, seeking better wages, working conditions and cost-of-living adjustments. All three companies agreed to tentative agreements about two weeks ago. Workers at other GM assembly plants voted against the deal, including 60% of workers at its Fort Wayne, Indiana, truck plant, 53% at its Wentzville, Missouri, plant, 58% of workers at GM's Lansing Grand River plant and 61% of workers at the Lansing Delta Township plant. Seven of GM's 11 assembly plants rejected the deal. In addition to Arlington, workers at plants in Detroit, Fairfax, Kansas; and Lake Orion, Michigan; approved the agreement. Only nine facilities are still listed without vote totals on the UAW vote tracker, including GM's Lockport, New York, components plant with about 1,200 members. Those voting in favor of the agreement have a lead of almost 2,500 and many of the facilities still to come include workers who stand to receive large pay increases upon ratification.

2021 Cadillac Escalade First Drive | Opulence at a cost

The Cadillac Escalade is one of the most recognizable cars in America, both on the road and in the minds of consumers. It is equal parts profit machine and pop culture icon, and it sits atop GM’s heavy-hitting hierarchy of body-on-frame SUVs. Sure, Cadillac may hold most of the cards in the luxury SUV marketing game, but itÂ’s not the only player. For starters, the Lincoln Navigator is quite good, and it takes a very similar approach to truck-based luxury. Both are flashy, cushy and high-tech, and their tuning acknowledges that driving dynamics will never be the strong suit of vehicles this large – though ride comfort certainly can be. To make matters worse, the Europeans are getting serious about their three-row SUV game, and while they may not offer the same body-on-frame capability you get from the Americans, they more than make up for it with brand prestige and state-of-the-art engineering. With such solid competition, Cadillac was not in a position to just phone in the EscaladeÂ’s redesign. The highlight of that effort is a new platform, shared with the new Chevrolet Tahoe and GMC Yukon, that finally features an independent rear suspension. There's also the gorgeous and tech-rich interior featuring a 38-inch curved OLED dash screen, a new diesel engine option and – stop us if youÂ’ve heard this one before – Super Cruise. While the Escalade does share its fundamentals with the Tahoe and Yukon, the Cadillac-branded variant of GMÂ’s big truck platform always gets special treatment. Only the very base model is available without a leather interior, for example, and the aforementioned in-cabin tech is exclusive to the Escalade. YouÂ’re also limited to just two engine options: the standard 420-horsepower V8 that's the range-topping option on GM's other SUVs, and the new 3.0-liter Duramax turbodiesel inline-six that's good for 277 hp and a V8-matching 460 pound-feet of torque. Both are paired with GMÂ’s 10-speed automatic transmission, and thereÂ’s no price difference, regardless of trim.   Like CadillacÂ’s other offerings, the 2021 Escalade has a split trim hierarchy. Above the base model, you can choose one of two paths: Premium or Sport. The Premium Luxury and Premium Luxury Platinum are your more traditional, flashier options, with lots of chrome and a rich, warm interior. The Sport and Sport Platinum are for those who prefer a more modern, subtle aesthetic, with blackout exterior trim and more subdued interior finishes.