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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

2020 Ford Escape hybrids vs other crossover fuel sippers: How they compare on paper

Along with a new generation of Escape, Ford also reintroduced the world to the 2020 Ford Escape Hybrid. And if that weren't enough, Ford is adding a plug-in hybrid version. This is a sign of the times: people are more crossover crazy than ever, but are also seeking ways to use less fuel, whether it's for environmental or purely money-motivated reasons. The Ford hybrids aren't the only fuel-efficient compact crossovers on the market. They will be going head-to-head with conventional hybrids including the 2019 Kia Niro, 2019 Nissan Rogue Hybrid and 2019 Toyota RAV4 Hybrid. There are other plug-in hybrids including the 2019 Subaru Crosstrek PHEV, 2019 Mitsubishi Outlander PHEV and the plug-in version of the 2019 Kia Niro. There are even a couple diesels in the form of the 2019 Chevy Equinox and 2019 GMC Terrain. So we've rounded up the details on all these crossovers to see who leads and lags in criteria such as power, fuel efficiency, space and price. Check out all their details below. 2019 Subaru Crosstrek Hybrid View 68 Photos How do their engines and fuel economy compare? Conventional Hybrids and Diesels Let's face it, if you're buying one of these crossovers, one of the things that matters most to you is just how frugal with fuel they are. We'll start off with the conventional hybrids and diesels, and the clear victor is the Kia Niro, which in base FE trim, manages to hit 50 mpg combined. This is thanks to it sharing its powertrain with the Hyundai Ioniq, the Hyundai equivalent of the Toyota Prius. Buyers should take note that only the FE returns such high fuel economy. The LX and EX drop to 49 mpg, and the S Touring and Touring get 43. Even then, the least efficient Niro is the most efficient of the normal hybrids and diesels. It is nearly the least powerful, though, with 139 horsepower. Just behind it is the Toyota RAV4 Hybrid. It delivers 40 mpg combined, and it has an ace up its sleeve: it comes standard with all-wheel drive. Every other vehicle in this powertrain group has front drive standard, and the Niro isn't available with all-wheel drive at all. If that weren't enough, the RAV4 Hybrid also boasts the most power at 219 horses. While we can't say anything about Escape Hybrid fuel economy, we do know that it will make 198 horsepower, which is close to the class-leading RAV4. The least powerful of these is the Equinox and Terrain, and they return the worst fuel economy at 32 mpg.

Next-gen Chevy Volt will get 1.5-liter, four-cylinder engine

As General Motors gets ready to unveil the new Chevy Volt at the Detroit Auto Show in January, it's starting to reveal a few more details about the updated plug-in hybrid. Today should be fruitful on that front, thanks to an event GM is hosting today that focuses on the new Volt, and we've just had the first bit of new: a bigger engine is coming. Since the beginning, the Volt has used a 1.4-liter, four-cylinder engine as a range extender when the battery runs dry. The second-generation model will instead get a slightly larger 1.5-liter, four-cylinder engine that will be built in Flint, MI. That's a step up from the various engines that have been a part of the 2016 Volt's rumored mills, everything from a 1.0-liter or 1.2-liter three-cylinder to a 2.0-liter turbo. The confirmation about the new 1.5-liter powerplant was found in Automotive News, where we also heard again that GM is going to start building the new Volt's electric drive unit in Detroit, moving production up from Mexico. We will have more information on the 2016 Chevy Volt later today.