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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.

2018 Mazda CX-5 teased ahead of LA reveal

While it will make its full debut at the LA Auto Show, Mazda released a teaser of the new CX-5 ahead of time. Like so many other teasers, the car is obscured by low light, but we can make out some significant details. For one, it appears that Mazda has toned down the muscular curves of the current CX-5's front fenders. In fact, many of the crisp creases of the current model have been softened on this new version. Below you can see a brighter version of the teaser alongside an image of the current model. The greenhouse also appears lower and longer than the current model, and it's highlighted by a chrome strip running from the A-pillar back to the roof. Where it terminates also seems to suggest this CX-5 could have the "floating" roof look that's so popular now. However, when comparing the teaser image with recent spy photos, it could just as easily have a more traditional rear pillar and roof design. Those same spy photos also reveal that the new CX-5 will get a more aggressive, concave grille with a mesh insert. This image is all Mazda has revealed of the new crossover so far, so we'll have to wait until the reveal on November 16 for all the details. Related Video:

Mazda Miata speedster and spyder concepts set for SEMA

Mazda will show speedster and spyder concepts based on the 2016 MX-5 Miata next week at SEMA in Las Vegas. The speedster is at the top of the teaser, and the spyder is the bottom half. The speedster goes with an extreme lightweight design. It has only a small wind deflector in place of the windshield and a blue ether topcoat. The spyder is a vintage roadster rendered into a modern form with a handcrafted leather interior and mercury silver paint job. Both are lighter than the production version and will be sure to get the hearts of Mazda fanatics and roadster enthusiasts alike racing at the possibilities. We doubt either will actually see production, like so many Miata-based concepts of the recent past. But that won't stop us from dreaming all the same. MAZDA TO SHOWCASE LIGHTWEIGHT PERFORMANCE AT SEMA WITH TWO MX-5 MIATA CONCEPTS - MX-5 Spyder and Speedster Concepts Bring Vintage Cues into Modern Designs - IRVINE, Calif., Oct. 29, 2015 -- The Mazda MX-5 Miata has been an exercise in honing the concept of a lightweight sports car for more than 26 years, created solely for driving exhilaration. But for the 2015 SEMA Show at the Las Vegas Convention Center, Mazda designers wanted to see what they could do if that idea was taken to the extreme. What they created were two vastly different takes on the fourth-generation MX-5: The 2016 MX-5 Spyder Concept and 2016 MX-5 Speedster Concept. MX-5 Spyder captures the character of a vintage roadster and translates it into a modern-day design, including bespoke leather interior details that were painstakingly crafted, and featuring a new Mercury Silver concept paint color. MX-5 Speedster is a study in the extremes of lightweight, purpose-built performance, paying homage to minimalist roadsters of the 1950s. The Blue Ether-painted MX-5 Speedster is uncompromised in its approach to wind-in-the-hair driving, going so far as to eschew a traditional windshield for a lighter deflector. Both cars are significantly lighter than the 2,332-lbs. MX-5 roadster that customers can purchase at dealers and come with a host of conceptual and aftermarket pieces and fabrication from partners including Racing Beat, Haartz Corporation, ASC – American Sunroof Corporation, Makin Industries/RAYS Wheels, KW Suspensions, Delta Seat, H&R Springs, Lusch, AC&A Manufacturing, Franks Fab Shop, Long Road Racing and SIM Specialty Interior Manufacturing.