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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 Halts Sale Of Most Chevy Cruze Models

General Motors has told dealers to stop selling some 2013 and 2014 Chevrolet Cruze compact cars. But the company won't say why. Dealers say stop-sale orders are routine and almost always made to fix a safety problem. They received the order in an e-mail Thursday, but no reason was given. The move comes as GM deals with fallout from a delayed recall of 1.6 million older small cars to fix an ignition switch problem. The company says the switches can slip out of the run position and shut down the engine. That causes loss of power steering and brakes and disables air bags. GM says the problem has been linked to 31 crashes and at least a dozen deaths. Spokesman Greg Martin says he has no details on the Cruze. Related Gallery Chevy Impala Earns Highest Accolades From Consumer Reports Recalls Chevrolet GM Cruze

GM veteran Bryan Nesbitt tapped to head Buick design

General Motors styling veteran Bryan Nesbitt (pictured above) took over a new role on Monday as executive director of global Buick design and global architectures. Andrew Smith, who previously did that job and also coordinated the look for Cadillac, has remained in charge of the pen at Caddy with this shift. Nesbitt rose to prominence when he designed the Chrysler PT Cruiser, according to Automotive News. He joined GM in 2001 and has been there ever since in multiple high-level roles. In 2007, he was appointed vice president of design for North America and was later briefly general manager of Cadillac in 2009-2010. Nesbitt took over as the vice president of GM's international operations design in China in 2011. This shuffle also moves Ken Parkinson, currently styling boss for Chevrolet trucks, to China as design vice president there. In addition, John Cafaro becomes the person in charge of the look for Chevy globally, rather than previously splitting that role between cars and trucks with Parkinson. GM Global Design Leadership Changes – effective June 1, 2015. Bryan Nesbitt, Design Vice President, GM China will repatriate to North America and assume the position of Executive Director, Global Buick and Global Architectures. He will be located in Warren, MI. Bryan will be the design Champion for Buick in the US and China. Ken Parkinson, Executive Director, Global Chevrolet Trucks and Global Architecture will assume the position of Design Vice President, GM China. He will be based in Shanghai, China. Andrew Smith, Executive Director, Global Cadillac and Buick Design will assume the position of Executive Director, Global Cadillac. He will continue to be the design Champion for the Cadillac brand. In addition, he will continue to lead the Global Color & Trim team. He will be based in Warren, Michigan. John Cafaro, Executive Director, Global Chevrolet Cars will assume the position of Executive Director, Global Chevrolet. He will be the design Champion for Chevrolet. In addition, John will lead the exterior components and accessories team. He will continue to be based in Warren, MI. The roles and responsibilities of Helen Emsley, Mark Adams, Carlos Barba, Clay Dean, Michael Simcoe, and Teckla Rhoades remain the same. Related Video: The video meant to be presented here is no longer available. Sorry for the inconvenience.