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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

Next Cadillac Escalade interior will have Mercedes-like screens

Not too long ago, we thought we got a glimpse at the next-generation Cadillac Escalade's interior. But as we have learned from the spy photographer who took it, those are actually for a different full-size GM SUV, probably the GMC Yukon. How can we know this? Well, that same photographer caught this SUV, and it has a fancier interior and a key Cadillac interior piece that proves this is actually the Cadillac interior. The big difference with this interior is the instrument cluster and infotainment system. The previous SUV we saw had a pretty conventional interior with plenty of buttons, a screen at the top of the center stack, and an instrument cluster under a plastic hood. On this presumed Cadillac SUV, it has one large monolith containing screens for instruments and infotainment. It's very much like what you'll find in Mercedes-Benz models. Unlike in Mercedes cars, this bank of screens appears to have some curve to it, orienting everything toward the driver. Besides the fancy screens that point to Cadillac, the shifter also clinches this as the Cadillac interior. It's the same monostable lever found in the latest Cadillacs such as the XT6 and CT5. Much of the rest of the interior has been pretty well covered. But we can tell that Cadillac is using some nice wood trim that appears to stretch across the dashboard. The dash itself also looks as though it will be rather low and minimalist. Like past Escalades, this will probably share most of its mechanicals with the Tahoe/Suburban, meaning it too will be making the long overdue switch to independent rear suspension. It will also likely continue to offer the 6.2-liter V8 and 10-speed automatic transmission as the only powertrain choice. We should see the new SUVs in the next couple of years.

Cadillac explains origins of Lyriq EV name

We feel for Cadillac, a brand we're inclined to dub the Alex Rodriguez of the automotive world — so much obvious talent, its gifts warped by repeated questionable moves and an inability to conclusively close the deal on The Big Stage. And as with Rodriguez, the expectations are so high at the same time the disappointment is so entrenched that Cadillac gets no benefits of any doubts, the commentariat ruthless with criticism for anything less than an out-of-the-park home run. This latest news, like the Newton-meter torque-based naming scheme initiated earlier this year, likely won't help. GM Authority asked Cadillac about the origin of the Lyriq name for the coming battery-electric crossover. Global head of brand strategy Phil Dauchy explained three threads that went into the new moniker. In no particular order, one thread is that "Cadillac," according to Dauchy, gets more mentions in song lyrics than any other brand, including non-automotive brands. The Music Lyrics Database, while not exhaustive, supports the case: Cadillac has 31 pages of lyric mentions among bands from Rancid to Weird Al Yankovic, beating every other brand we could think of. So ... lyrics into Lyriq. The second thread is rolled up with Cadillac's move to proper names instead of alphanumerics for the sedan and crossover lines, all of those names to end in "iq," as well as the push into electric vehicles. Dauchy told GMA the nomenclature overhaul and the two-letter suffix "[signal] that Cadillac is bringing a different type of vehicle to market, one that works in concert with man, nature, and machine." He's bullish on swaying the public with the product, adding, "When you see [the Cadillac Celestiq], its size, presence and scale all connote the emotion associated with the name." The final thread that went into the Lyriq name the alliteration of brand and model names. As GMA phrased it, perhaps unsettlingly, "With Cadillac and the model name both ending in an 'ick' sound, these names roll off the tongue quite well." This brings up a question raised in a number of comments about the Lyriq, which asks whether the last syllable is pronounced "ick" or "eek." Until now, I've pronounced the coming crossover with an "eek" at the end. "Lyr-eek" strikes me as more luxurious, and "Celest-eek" sounds better to me than "Celest-ick," that latter model being the flagship EV that follows the Lyriq. Of course, it also makes me wonder if I've been pronouncing "Cadillac" correctly.