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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 CEO Akerson calls out Tesla, says Cadillac will compete on EVs

Cadillac will be taking on Tesla Motors, the underdog EV manufacturer that's seen heaps of critical acclaim and stock market buzz with its most recent sedan, the Model S. "If you want to compete head-to-head with Tesla, and we ultimately will, you want to do it with a Cadillac," Dan Akerson, the chairman and CEO of General Motors, told media in Washington, according to The Detroit News.
Akerson continued, telling The News, "We'll sell more Volts and lose less money on the Volts than they'll lose on the Model S." He also took time to point out that Tesla getting vehicles out to customers isn't a guarantee of success or permanence, using Fisker as an example, saying "Does anybody even remember Fisker? I mean, there were a number of them; they are all gone."
This strong talk from Akerson comes after Doug Parks, another GM exec, let slip that the Detroit-based manufacturer has an EV in the works that will cover 200 miles per charge and only cost about $30,000, a massive upgrade over similarly priced EVs that struggle to top 100 miles per charge. Until that vehicle arrives, though, GM is preparing the Cadillac ELR, a small coupe that, like the Volt with which it shares technology, uses a gas engine as a mobile generator to recharge the batteries. Akerson took aim at Tesla again, saying, "But I do think when the ELR comes out late this year, early next - it's certainly the same postal code as Tesla, but now we're going to move up. It's not going to be a mass-produced car."

Cadillac teases camo'd ELR ahead of Detroit debut

With the 2014 Cadillac ELR being introduced next week at the Detroit Auto Show, General Motors has revealed another picture of its luxury range extended electric vehicle. Last month, we saw a dark, teaser photo showing some of the body detail for the electric coupe, but this recent photo shows the Cadillac in full camouflage testing in California back in September.
If this car looks familiar, it's because our spy shooters got a jump on GM by catching the car in action and providing pictures from all angles. There are still no official details for the ELR yet aside from the fact that it will share the Voltec system with the Chevrolet Volt, but we'll finally see the car unveiled in Detroit a week from today.