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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

Akerson says Cadillac will get a larger sedan within two years

It seems that during a recent affair showing off the 2014 Cadillac CTS, General Motors CEO Dan Akerson confirmed reports regarding a new Cadillac flagship sedan. According to USA Today, which Akerson was visiting, he said that a sedan larger than the XTS would debut within the next two years.
This matches up with what we heard earlier in the month about a Cadillac model that will go up against the BMW 7 Series and Mercedes-Benz S-Class (not a pricier, low-volume sedan also discussed in that article). But this is the first time a high-profile executive name has been attributed to such a report, and the first time a broad timeframe has been mentioned. This article adds that the unnamed car will be rear-, and all-wheel drive with a platform "loosely based" on the new CTS, with styling closer to that car than recent Cadillac concept vehicles. The XTS will continue production of course, as well.

GM CEO to meet with U.S. lawmakers over job cuts

WASHINGTON — General Motors Co Chief Executive Mary Barra plans to visit Capitol Hill next week to discuss the company's plans to halt production at five plants in North America next year and cut up to 15,000 jobs, two congressional aides said on Friday. GM has come under harsh criticism from lawmakers from both major political parties, and from President Donald Trump, since Monday when it announced the biggest restructuring for the U.S. No. 1 carmaker since its bankruptcy a decade ago. Barra is expected to meet with lawmakers from Michigan and Ohio, where GM plans to shutter three plants, as well as senior leaders in Congress. GM did not immediately comment. Barra has been calling lawmakers this week to explain the decision to end production. Trump has threatened to revoke subsidies for GM. The Detroit automaker plans to halt production next year at three assembly plants: the Lordstown small-car factory near Youngstown, Ohio; the Detroit-Hamtramck complex in Detroit; and the Oshawa, Ontario, assembly complex near Toronto. It will also stop building several models now assembled at those plants, including the Chevrolet Cruze, the Chevrolet Volt hybrid, the Cadillac CT6 and the Buick LaCrosse. Additionally, GM plans to shutter the Warren transmission plant outside Detroit and a plant that makes electric motors and drivetrains outside Baltimore, Maryland. The Cruze compact car will be discontinued in the U.S. market in 2019, although GM may continue building it in Mexico for other markets, Barra said. Reporting by David Shepardson. Related Video: