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Mazda patents show rotary engine for range-extended EV
Fri, Mar 17 2017Two years ago, Mazda introduced a fascinating range-extended electric car called the Mazda2 RE Range-Extender. It took an electric Mazda2, and dropped in an itty-bitty 330cc rotary engine. It wasn't the rotary-powered sports car we had hoped for, but it seemed like a unique way to keep the quirky engine alive and kicking. But not long after the car's reveal, it seemed to disappear. Now the basic idea has resurfaced with a few modern updates in a couple of US patents. The first patent is pretty straightforward and describes a range-extended EV similar to the BMW i3. At the front is an electric motor driving the front wheels. At the back is an internal combustion engine that powers an electric generator. In the middle is a lithium-ion battery for storing and delivering electricity. It's the same set-up as that Mazda2. The second patent is for an engine start-and-stop system, but specifically for rotary engines. The system is designed to shut off a rotary engine when not needed, much as modern piston engines do. It also stops the rotor in a position that closes the intake port to ensure no fuel or exhaust emissions slip out through the intake tract. This is necessary since there are no valves in a rotary, and air and exhaust come through ports that are "opened" and "closed" by the rotor itself. The patent also describes the possibility of firing a spark plug after the fuel has been cut to eliminate any leftover fuel emissions. This system would theoretically improve a rotary engine's fuel economy and emissions significantly, which would be a boon as those are two of the rotary's major weaknesses. The rotary-engine patent also includes the same range-extended powertrain drawing as the first patent. It's there as a description of a possible application. And in such an application, where the rotary wouldn't have to run all the time, the system could take advantage of the rotary's inherent strengths. Weight can be kept low thanks to the engine's small dimensions, which should help in keeping the car sprightly and efficient. Rotaries are renowned for smoothness, too, so it shouldn't need too much refining and sound deadening, the latter of which adds more weight. The small size would also help with packaging, leaving more space for people, cargo, or possibly batteries. And since it has been patented, the company may be looking to bring the system to market.
Autoblog Podcast #523 | BMWs, Trackhawk and Mazda's new engine technology
Fri, Aug 11 2017On this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Associate Editor Joel Stocksdale. We discuss a couple of BMWs, the upcoming BMW X7 three-row SUV and our short-term BMW M760i with a turbocharged, 600-horsepower V12. We also cover the week's news, including Mazda's nifty engine technology it will roll out in the next few years, as well as pricing on the new Jeep Grand Cherokee Trackhawk. The rundown is below. Remember, if you have a car-related question you'd like us to answer or you want buying advice of your very own, send a message or a voice memo to podcast@autoblog.com. (If you record audio of a question with your phone and get it to us, you could hear your very own voice on the podcast. Neat, right?) And if you have other questions or comments, please send those too. Autoblog Podcast #523The video meant to be presented here is no longer available. Sorry for the inconvenience.Get The Podcast iTunes – Subscribe to the Autoblog Podcast in iTunes RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Topics and stories we mention Rundown BMW X7 Spy Shots Volkswagen Passat GT Mazda's future engine technology Jeep Grand Cherokee Trackhawk Pricing BMW M760i driving Ram 2500 driving Spend My Money Feedback Email – Podcast at Autoblog dot com Review the show on iTunes
Mazda shows lightweight MX-5 Spyder and Speedster at SEMA
Tue, Nov 3 2015Ever since Mazda dropped the first teaser on us last week, we've been looking forward to seeing what it had in store for us at SEMA this year. Now we've seen it what Mazda has dubbed the MX-5 Spyder and MX-5 Speedster, and they were worth the wait. The Spyder goes vintage with a silver paintjob and a brown top stretched overhead. It also has an aero kit, grille, and tonneau cover done up in carbon fiber, rides on 17-inch wheels, and features a natural leather interior. The blue Speedster, meanwhile, goes for the stripped-down, wind-in-your-hair experience. It has no roof or windshield, just a tiny deflector at the front of the dashboard. It's dropped an inch closer to the ground on an adjustable coilover suspension with 16-inch alloys, and features a center-exit exhaust. Carbon fiber helps trim 250 pounds from the curb weight, along with a stripped out interior trimmed in Alcantara. Both look pretty slick, and disappoint only in so far as they (like so many of their predecessor concepts) won't be heading for production. If they were, we'd be hard pressed to choose between the two. Which would you go for? Mazda Reveals Extreme Lightweight Design Concepts at 2015 SEMA MX-5 Concepts Display Two Different Takes on Staying True to Pure, Lightweight Sports Car Philosophy LAS VEGAS (November 3, 2015) – Mazda revealed two design concepts today at the SEMA Show in Las Vegas, based on its all-new 2016 MX-5 Miata—MX-5 Spyder and MX-5 Speedster—demonstrating two vastly different takes on lightweight, open-air performance. Lightweight. Fun-to-drive. Roadster. Those three tenets have served as the foundation for the Mazda MX-5 Miata since its 1989 introduction and continue to serve the new fourth-generation model. Focused, lightweight engineering is a guiding principle of every Mazda vehicle made with SKYACTIV Technology, allowing for greater efficiency, improved performance and agile handling dynamics. But what if that sense of lightweight performance were taken to the extreme? What if Mazda's North American designers harkened back to vintage roadsters to create thoroughly modern, bespoke concepts for what a lightweight performance car should be The results would be the MX-5 Spyder and MX-5 Speedster concepts. "Both MX-5 Spyder and MX-5 Speedster are uncompromising designs that highlight the core strengths of MX-5," said Ken Saward, design manager, Mazda North American Operations.