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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

Plug In 2014: VIA makes the case for 'free' plug-in hybrid work vans, trucks

If you're a fleet manager who's been waiting anxiously for the chance to buy a plug-in hybrid van from Via Motors, your wait is almost over. If you work for the right fleet, anyway. David West, the chief marketing efficer for VIA Motors, took AutoblogGreen for a ride around the San Jose Convention Center in a Via van sporting an Electric Blue paint job as part of the Plug In 2014 Conference this week and gave us an update on how things are coming along. The big news is that the Via PHEV van production is going to start by the end of September. Via can currently build two vans an hour at its production plant in Mexico, or about 16 a day and could easily double that. "That would get us to 20,000 a year with two full lines running," West said. "We have the capacity." "There is no way gas can compete with electric." – David West, Via Motors But they can't sell that many quite yet. By the end of December, around 350 Vans will be made, mostly for a $20-million program from the Department of Energy (DOE) and the South Coast Air Quality Management District that will see the vehicles used by fleets that will report energy data to the Idaho National Lab. Via is also finishing up CARB certification for both the van and the company's plug-in hybrid pick-up truck. About 50 percent of Via's technology in the truck will not need to be tested again, since it's the same as what's in the van, but things like crash tests will need to be done twice. Despite the progress, this is not where Via hoped it would be today. The bankruptcy of battery supplier A123, "took about a year off our timeline," West said. "It's been getting a little slow getting it to market, there have been some challenges, particuarly since we had the country's worst recession right in the middle of this wrap up, but it's inevitable in my mind. There is no way gas can compete with electric." Maybe that's why FedEx has expressed an interest in buying around 5,000 units, West said. FedEx already has some pilot vehicles, just like Verizon does, and PG&E wants to replace all of their gas trucks with electric vehicles, which would be another 3,000 sales, he said. Besides the fuel savings, vehicles like these, with easy on-site power generation, could also work wonders in post-disaster situations, he said, since they could replace the need for generators.

Weekly Recap: Bentley Bentayga leads luxury SUV charge at Frankfurt

The Bentley Bentayga is launching a new era of ultra high-end sport utility vehicles that will see luxury makers vie for the world's richest and most exclusive customers. The Bentayga is Bentley's first SUV, and it will formally debut next week at the Frankfurt Motor Show. It's loaded with Bentley's best technology and features, led by a 600-horsepower W12 engine. The mission is simple: stop giving up sales to other companies by not having an SUV in its portfolio. "It creates an entirely new category of ultra-luxury SUV, where there are currently few rivals," IHS Automotive analyst Ian Fletcher said in a report. But Bentley and the Bentayga will soon face stiff competition. Archrival Rolls-Royce will produce its own crossover to be built in England, though timing is unclear. Lamborghini has approved plans for a ute that will be assembled in Italy and launch in 2018. Even the sportier British brands are getting into the market. Aston Martin will make a crossover version of the DBX concept shown earlier this year in Geneva, and Jaguar is launching the F-Pace crossover, which will debut in Frankfurt. These new entries will invigorate a segment that's comprised of the Mercedes G63 AMG and the Land Rover Range Rover SV Autobiography, and Bentley is poised to grab a large share of it, Fletcher noted. IHS forecasts Bentayga sales could hit 3,000 units per year in 2017 and 2018, pushing total Bentley sales to more than 10,000 in the next few years. The vehicle will also get plug-in hybrid and diesel variants to widen its reach. The Bentayga is a sales grab, for sure, but Bentley took care to ensure the SUV remained true to the brand. It's laden with the top-shelf wood, leather, and metal, and it comes standard with an expansive panoramic glass roof. It also has intelligent features like electronic night vision and an optional responsive off-road system that can be configured to adapt to eight different settings. It's a different kind of Bentley, but it's a harbinger of things to come for the world's richest luxury makers. Other News & Notes Toyota debuts next-gen Prius Toyota revealed the next-generation of its iconic fuel-sipping hybrid, the 2016 Prius, at an event in Las Vegas. The car promises 10-percent gains in fuel efficiency, though actual figures – and even powertrain specifics – were not revealed. We estimate that could mean about 56 miles per gallon in city driving and 53 on the highway.