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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's Johan de Nysschen clarifies a few points on the brand's future

Last week, Motor Trend ran coverage on a journo roundtable with Cadillac president Johan de Nysschen. During the roundtable, de Nysschen cited a few reasons for the decline in sedan sales, including gas prices, "young consumers" — read, millennials — less interested in driving dynamics than lifestyle accessories, and the state of U.S. infrastructure. Jalopnik homed in on the last two reasons, and those became the story, including here in our post on the roundtable. So de Nysschen called Jalopnik to add more context. The original reaction pieces painted de Nysschen's rationales as an excuse for sporty sedans not selling well, when the issue is Cadillac's sporty sedans not selling well. His main clarification: "I wasn't advocating the idea that the world is black and white, that if you're a young buyer a millennial or a teenager that you don't enjoy driving." On that note, it would be ridiculous to deny millennial and sedan-segment bugbears; de Nysschen has market research and the industry-wide, rabbit-like crossover breeding program to back him up. Yet even as he touted the success of the XT5, noting that it's "the third-best-selling luxury nameplate in the U.S. after the Lexus RX, and the Mercedes C-Class," he could add, "But the irony is not lost on me that the C-Class is a sedan." The circumstances laid out in the follow-up piece inject more likely color into the situation: the brand's onetime, singleminded focus on the U.S., followed by a singleminded focus on China that left the U.S. market wanting for attention. We could add to that: years of lackluster products and awful attempts at volume and brand engineering under the old GM at the same time that downsized premium luxury products, crossovers, and SUVs began their rocketship trajectories; trying to live off the Escalade success; and the carmaker's desire not to offend its older, traditional buyers while concurrently wooing "coastal influencers." De Nysschen also acknowledged that Cadillac interiors aren't where they need to be, saying, "We recognize that's where we want to improve." The result, as de Nysschen put it, "We're playing with the hand that we've been dealt.

New Takata problem results in recall of 414 GM vehicles

An airbag-inflator rupture discovered by Takata during testing has resulted in a new recall affecting 414 vehicles from General Motors, including 395 of them in the US. This latest campaign covers 2015 model-year examples of the Buick LaCrosse, Cadillac XTS, Chevrolet Camaro, Equinox, Malibu, and GMC Terrain. There are no reported breaks in any of these vehicles on the road, and the company estimates only one percent of them actually have the faulty parts. According to documents submitted to the National Highway Traffic Safety Administration (as a PDF), one side-airbag inflator failed a cold test at -40 Fahrenheit "releasing high pressure gas and propelling the separated components apart." The supplier told GM about the failure the next day. In these vehicles, the safety device might not only burst but the bag could inflate incorrectly, as well. GM and Takata say that a cause is not yet known, but they are "conducting an investigation." GM will begin notifying affected owners via overnight mail on Oct. 19. Dealers will replace the side airbag modules on all of the affected vehicles with new components outside of the suspect lot. All of the removed parts will also be collected for further study. Takata's faulty front airbag inflators have resulted in a serious scandal for the supplier. Initial figures indicated 34 million US vehicles are need of repair, though more recent figures have knocked that down to 23.4 million bad parts in 19.2 million automobiles. GM was already among the dozen automakers with models to fix, and some of its pickups were affected, along with the Saab 9-2X and Pontiac Vibe. GM Statement: General Motors is recalling 395 cars and crossovers in the U.S. because one of the front seat side air bags inflators may be defective. In the event of a deployment, the air bag's inflator may rupture and the air bag may not properly inflate. The rupture could cause metal fragments to strike the vehicle occupants, potentially resulting in serious injury or death. GM is unaware of any incidents involving vehicles with these components, which were part of a lot in which one inflator failed acceptance testing at the supplier. Dealers will replace the side air bag module or modules in affected vehicles. Including Canada, Mexico and exports, the total population of the recall is 414, GM estimates 1 percent of the recalled vehicles may have the defect.