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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 seeks national mandate for zero-emissions cars

DETROIT — General Motors says it will ask the federal government for one national gas mileage standard, including a requirement that a percentage of auto companies' sales be zero-emissions vehicles. Mark Reuss, GM's executive vice president of product development, said the company will propose that a certain percentage of nationwide sales be made up of vehicles that run on electricity or hydrogen fuel cells. GM says a nationwide program modeled on such a requirement in California could result in 7 million electric vehicles, or EVs, on U.S. roads by 2030. California wants 15.4 percent of vehicle sales by 2025 to be EVs or other zero emission vehicles. Nine other states, including Maryland, Massachusetts, New Jersey and New York, have adopted those requirements. In January, California Governor Jerry Brown set a target of 5 million zero-emission vehicles in California by 2030. The Trump administration criticizes California's ZEV mandate, saying it requires automakers to spend tens of billions of dollars developing vehicles that most consumers do not want, only to sell them at a loss. Reuss told reporters that governments and industries in Asia and Europe "are working together to enact policies now to hasten the shift to an all-electric future. It's very simple: America has the opportunity to lead in the technologies of the future." A national mandate also would create jobs and reduce fuel consumption, CO2 emissions and "make EVs more affordable," Reuss added. GM, the nation's largest automaker, will spell out the request Friday in written comments on a Trump administration proposal to roll back Obama-era fuel economy and emissions standards, freezing them at 2020 levels instead of gradually making them tougher. Under a regulation finalized by the Environmental Protection Agency at the end of the Obama administration, the fleet of new automobiles would have to get 36 miles per gallon by 2025, 10 mpg higher than the current requirement. But the Trump administration's preferred plan is to freeze the standards starting in 2021. Administration officials say waiving the tougher fuel efficiency requirements would make vehicles more affordable, which would get safer cars into consumer hands more quickly. GM on Thursday said it doesn't support the freeze, but wants flexibility to deal with consumers' shift from cars to less-efficient SUVs and trucks.

GM earnings rise 1% as buyers pay more for popular pickups

DETROIT — General Motors said Thursday that higher prices for popular pickup trucks and SUVs helped overcome slowing global sales and profit rose by 1% in the second quarter. The Detroit automaker said it made $2.42 billion, or $1.66 per share, from April through June. Adjusting for restructuring costs, GM made $1.64 per share, blowing by analyst estimates of $1.44. Quarterly revenue fell 2% to $36.06 billion, but still beat estimates. Analysts polled by FactSet expected $35.97 billion. Global sales fell 6% to 1.94 million vehicles led by declines in North America and Asia Pacific, Middle East and Africa. The company says sales in China were weak, and it expects that to continue through the year. In the United States, customers paid an average of $41,461 for a GM vehicle during the quarter, an increase of 2.2%, as buyers went for loaded-out pickups and SUVs, according to the Edmunds.com auto pricing site. The U.S. is GM's most profitable market. Chief Financial Officer Dhivya Suryadevara said she expects the strong pricing to continue, especially as GM rolls out a diesel pickup and new heavy-duty trucks in the second half of the year. "We think the fundamentals do remain strong, especially in the truck market," she said, adding that strength in the overall economy and aging trucks now on the road should help keep the trend going. Light trucks accounted for 83.1% of GM's sales in the quarter, and pickup truck sales rose 8.5% as GM transitioned to new models of the Chevrolet Silverado and GMC Sierra, according to Edmunds, which provides content to The Associated Press. As usual, GM made most of its money in North America, reporting $3 billion in pretax earnings. International operations including China broke even, while the company spent $300 million on its GM Cruise automated vehicle unit. Its financial arm made $500 million in pretax income. Suryadevara said GM saw $700 million in savings during the quarter from restructuring actions announced late last year that included cutting about 8,000 white-collar workers through layoffs, buyouts and early retirements. The company also announced plans to close five North American factories, shedding another 6,000 jobs. About 3,000 factory workers in the U.S. whose jobs were eliminated at four plants will be placed at other factories, but they could have to relocate. GM expects the restructuring to generate $2 billion to $2.5 billion in annual cost savings by the end of this year.