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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

Crowd lifts Cadillac to free pedestrian after two vehicles barrel toward him

An elderly Missourian is lucky to be alive today after a car that had pinned him to the ground was lifted off him by witnesses. According to WDAF, Orlando Gentry and Troy Robertson were working at a Kansas City, Mo., clothing store when a stolen minivan careened through a red light at 35th and Prospect and was immediately T-boned by a woman driving a gold Cadillac. The impact drove both vehicles up onto the sidewalk at the corner, side by side, directly at pedestrian Carlos Green. "We was out here with our kids, and we was at work, and the next thing we heard was a boom!" Gentry told WDAF. "Man, those cars came out of nowhere, and Carlos was just helpless," Robertson said. Gentry tried to escape but was caught between the vehicles and pinned beneath the Caddy. Then a light pole punctuated the crash by falling on top of the Caddy - and almost on top of Carlos Green. "Yeah, he tried to jump out of the way, but he just got pinned underneath the Cadillac. He definitely hurt his right leg. When I saw all that, I screamed, 'Somebody help me help get this car off Carlos,'" Robertson said. He, Gentry and passersby lifted the heavy Caddy off Green so he could crawl free. Thankfully, Green wasn't seriously injured. He was discharged from an area hospital bruised, with one leg in a cast, but ultimately healthy. The woman driving the Cadillac was unhurt, but the two men driving the minivan ran off during the confusion. Kansas City police are looking for the escaped car thieves. This is the second time in as many weeks that people banded together to lift a car off someone. On May 9 in Philadelphia, a group of good Samaritans lifted an SUV off a little girl who had been run down and pinned beneath an SUV tire. Related Video:

GM to accelerate its EV strategy — Cadillac could be all-electric by 2025

General Motors will roll out details of an expanded and accelerated electric vehicle strategy on Thursday in an effort to convince investors it can be a serious competitor to Tesla, people familiar with the plans said. GM Chief Executive Mary Barra, who is scheduled to speak at a conference hosted by Barclays, is expected to say the automaker is ready to spend more on electric models by 2025 than the $20 billion previously outlined, the sources said. Supplier sources said previous plans to make the Cadillac brand all-electric by 2030 are being sped up, possibly to 2025, and other sources said that acceleration will be repeated in other brands and in segments such as commercial vans. Asked about the Thursday appearance, a GM spokeswoman called talk of increased spending speculative and declined to give details. The Detroit automaker is also expected to discuss a new timeline for many of the EVs to follow those already identified, such as the GMC Hummer EV pickup and Cadillac Lyriq crossover, people familiar with the plans said. Lyriq (shown above) is slated to go into production in late 2022, but GM officials have been stung by criticism the automaker was bringing the vehicle to market too late, one source said. "The pull-ahead in programs is real and the organization is really doubling down on speeding up product development," the source said. Barra and other GM executives have been signaling the automaker's EV acceleration plans. She said earlier this month GM would boost capital spending over the next three years to speed EV development and was talking with other automakers about partnerships to develop more vehicles using GM's battery technology. Last week, a GM executive said the company had pulled forward the rollout of two "major" EV programs, and GM officials have touted the faster 18-month development time for the Hummer truck. Tesla's soaring market capitalization, and growing pressure from regulators to phase out carbon-emitting engines, has put pressure on established automakers to respond to investors who view their internal combustion lineups as outmoded and doomed in the long run. A critical part of GM's pitch to investors has been its new Ultium batteries, which it estimates will offer an electric driving range of 400 miles or more on a single charge. It is building a battery plant with Korean battery maker LG Chem in northeast Ohio.