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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

North American Car, Truck and SUV of the Year finalists revealed

The finalists for the 2023 North American Car, Truck and Utility Vehicle of the Year Awards were announced Thursday at the L.A. Auto Show. — The Acura Integra, Genesis Electrified G80 and Nissan Z made the cut in the car category. — The Ford F-150 Lightning, Chevy Silverado ZR2 and Lordstown Endurance advanced in trucks. — And the Cadillac Lyriq, Genesis GV60 and Kia EV6 advanced among utilities.  The winners will be announced Jan. 11 in Detroit.  The finalists underscored the industryÂ’s shift to electric vehicles, as all three utilities and two of the three trucks are EVs. The finalists were culled from a list of 26 semifinalists made up of three trucks, 10 cars and 16 utility vehicles that are new this year.  Notables that missed the cut include the Mercedes EQE, Subaru WRX and Toyota GR Corolla in cars; while the Honda CR-V, Kia Sportage and Rivian R1S were among the utes that did not advance. The three trucks are the only ones eligible this year and have advanced through the voting.  50 jurors who work for media outlets across North America vote three times over the course of the year to whittle down the field, which was originally 47 vehicles. Jurors also test the semifinalists at an October group event in Ann Arbor, Mich. The Honda Civic (car), Ford Maverick (truck) and Ford Bronco (utility vehicle) were the 2022 winners. Autoblog Editor-in-Chief Greg Migliore is a NACTOY juror.   Featured Gallery Ford F-150 Lightning View 48 Photos Green LA Auto Show Acura Cadillac Chevrolet Ford Genesis Kia Nissan Truck SUV NACTOY Lordstown Endurance

2017 Cadillac XT5 First Drive

Thousands of feet above the Pacific Ocean, the winding roads that lead to the summit of Palomar Mountain turn from undulating curves to tight, blind, hairpin bends. Most drivers along this route are looking for a chance to exploit the limits of their cars' handling as much as one can on public roads, while taking in the bucolic views and endless blue skies. Up here, taking the thrilling curves at high speed is best left for drivers of performance cars who have platinum health insurance, lest the possibility of rolling a vertical mile toward Hellhole Canyon Preserve (we are not making this up) is not a deterrent. How different the experience is when you've chosen to climb the mountain in the 2017 Cadillac XT5, the crossover that replaces the SRX in a growing lineup of refined and redefined XT-named utility vehicles. An instant reminder that this SUV is not a Lotus comes as we enter a corner with a smidgen too much gusto, the tires begin to claw for traction, and the seatbelts tighten with the grip of sudden death. A quick tap of the brakes releases the belts, but not before a bead of sweat forms on the forehead. The overwhelming feeling is one of being unsure if this exercise is out of the XT5's comfort zone, despite Cadillac's goal of hitting the high-achieving sweet spot of the sport-luxury crossover segment. You'll know that an XT5 isn't an SRX when you first see one, although the differences are harder to tell when the two are parked side by side. The XT5 is the second Cadillac model to arrive since the brand learned to speak with a New York accent (albeit an affected Soho dialect) and it's a key pillar to the brand's chances at worldwide success. In 2015, the final year of sales for the five-year-old SRX, Cadillac managed to sell almost 100,000 of them around the world – no small feat for a model about to be replaced, and proof of the crossover's relative freshness and its popularity in export markets like China. Like the SRX that precedes it, the XT5 will be available with either front- or all-wheel drive (a $2,645 option), but that's one of few commonalities with the outgoing model. A new, lighter chassis helps the XT5 shed about 300 pounds, although Cadillac favors high-strength steel for bodywork and leaves aluminum for the engine and interior trim. In line with the revised brand guidelines for naming, SRX evolved into XT5, leaving room for larger and smaller utility vehicles to eventually join the lineup.