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Mazda patents show rotary engine for range-extended EV

Two 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.

Mazda to celebrate 25 years of MX-5 with 15 Miatas in New York

Having first debuted at the Chicago Auto Show in 1989, the Mazda MX-5 Miata has been on the market now for an impressive 25 years. So to celebrate that quarter-century anniversary, Mazda is bringing no less than 15 examples of the legendary roadster from throughout its history to the New York Auto Show this year.
Mazda isn't saying just which versions of the MX-5 it's bringing to the Javitz center this year, but with three generations to choose from and over 900,000 units built and sold, there are plenty of examples - including production versions, special editions and concept cars.
What would really put the cherry on this birthday cake, however, would be if Mazda were to surprise us in Manhattan with the debut of the highly anticipated fourth-generation Miata that we're expecting to debut sometime this year.

Reminder: Come hang out with Autoblog and the 2016 Mazda MX-5 Miata on Tuesday, May 19

Do you love chilidogs, French fries, meeting new friends, and the world's most popular convertible? Do you live in Southeast Michigan? Do you like lists of questions? If you answered "yes" to any but the last of those, we'd like to invite you to a little get-together we're hosting next week. Driving impressions are still under embargo for the US-spec 2016 Mazda MX-5 Miata, but somehow we've conned convinced company PR reps to show the car to you, Joe Public Autoblog Reader. We're enthused about telling you more about the ND Miata, but before we do we'd love to share a Coke and talk about cars. Here's the skinny. A group of Autobloggers will be hanging out at the Athens Coney Island, in Royal Oak, MI, next Tuesday, May 19. We'll have the car on display from 5:00 PM to 8:00 PM, and we'd love to see you. If you're a Miata owner, we'd also love to for you to bring your car along for the party. The more convertibles the better (just be prepared to have your picture taken). Go ahead and set your navi for Athens – 32657 Woodward Ave., Royal Oak, MI 48073 ­– and we'll look forward to seeing you Tuesday. Mazda Geeks unite. Related Video: