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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 drops diesel engines for 2020 Chevy Equinox and GMC Terrain crossovers

GM is officially discontinuing the diesel engine in the Chevy Equinox and GMC Terrain for the 2020 model year. The 1.6-liter turbodiesel was always an oddball of an engine in the compact crossover segment, and now the experiment has come to an end. The Car Connection initially reported the news, and a GMC spokesperson, Stuart Fowle, confirmed it to us this morning.  “A huge majority of our Terrain customers have opted for one of our two gas engines," says Fowle. We canÂ’t say this eventuality comes as a massive surprise, as we saw news from couple of months ago that GM was dropping all-wheel drive from the diesel-powered cars for 2020. Low demand was cited as the reason for that cull, and itÂ’s the same for the little GM crossovers this time around, too. These vehicles were the only ones powered with a diesel engine in their class, but thatÂ’s going to be changing. Just as GM is going away from the diesel, Mazda is finally bringing its diesel to market in the CX-5. YouÂ’ll only be able to get that engine in the most expensive ($42,045) trim level, combined with all-wheel drive, though. The cheapest Equinox diesel starts at a comparably low $30,795. ThatÂ’s a $2,400 upcharge over the base 1.5-liter turbo four-cylinder, and the value is questionable. Mileage is better, but diesel fuel is more expensive. Towing capability didnÂ’t increase over the base engineÂ’s 1,500-pound capacity, but the extra torque around town was nice. As diesels go in the U.S., this one was rather rough and noisy, possibly contributing to some turning their noses up after a test drive. Perhaps another reason for its demise was that the much quicker 2.0-liter turbo Equinox was only $100 more than the diesel. This engine offered significantly better towing at 3,500 pounds, too. You can read all about what we thought of the diesel in our first drive review here, but the 2019 model year is the last one if you had it on your shortlist. This article has been updated to indicate the source.

Recharge Wrap-up: GM, LG Chevy Bolt collaboration, Honda Energy Star plants

Green Car Reports details the relationship between GM and LG in the development and production of the Chevy Bolt. The unique relationship between the two companies began in 2008, and now sees LG producing a multitude of systems for the Bolt, many of which were designed by or with GM. LG's involvement in the Bolt has gone so deep as "defining what will this vehicle be, everything from how we are going to package it, what size it should be, what kind of performance it should have," according to Pam Fletcher, GM's Executive chief engineer for electrified vehicles. Forgoing the traditional automotive relationship for a more collaborative one doesn't just save money, but it also gives GM access to LG's suite of technologies and manufacturing capabilities. Read more at Green Car Congress. The EPA has awarded three Honda factories with Energy Star certification. The automaker's assembly plants in Marysville and East Liberty, Ohio have now earned Energy Star certification ten consecutive years. The Marysville plant added LED lighting, hydrogen-powered tow motors and forklifts, high efficiency HVAC and direct-fired water boilers. The East Liberty facility added new LED lighting and replaced a large water heater with a high-efficiency one. Honda's newest US plant, Honda Manufacturing of Indiana, installed LED lighting and used energy efficient features in its recent expansion. Honda also cites a culture of energy-mindedness – for every associate – for its success. "When everyone involved considers energy efficiency and how they can help the environment, results improve," says Karen Heyob, Honda's sustainability boss in North America. Read more from Honda. The student-led Associated Students of the University of Montana (ASUM) Transportation has ordered two Proterra electric buses. The 40-foot Catalyst Fast Charge buses will serve the campus, and will recharge with a semi-autonomous fast charger. "As part of our ongoing effort to innovate service, align with student advocacy and reduce our carbon footprint, we take great pride in our decision to go electric," says ASUM Office of Transportation Director Jordan Hess. "We hope this encourages – and challenges – other universities to seriously consider the economic and environmental benefits of zero-emission buses." Read more in the press release below. First Student-led Transit Agency in the U.S.