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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.

Next Mazdaspeed3 could look this good

Mazda showed off its brand-new 2014 Mazda3 at an event in New York City earlier this week, and we have to say, at first blush, we're pretty impressed. It looks fantastic - like a smaller, hatch'd version of the already sleek Mazda6 sedan that went on sale earlier this year. And with a 200-pound weight reduction, efficient Skyactiv gasoline engines underhood and Mazda's usual focus on driving dynamics above all, we're willing to bet that the new Three will be a pretty decent steer.
Of course, being enthusiasts, we're already setting our sights on the next-generation Mazdaspeed3, rendered here by artist Theo Chin. To our eyes, it's not a very imaginative transformation, but is likely a spot-on rendering for what the next car will look like. And it's really, really hot.
While Mazda hasn't exactly confirmed that the new Speed3 will be coming, sources within the automaker have indicated that a third-generation version of the MS3 is under development. Thing is, the Japanese automaker wants to give the standard Mazda3 some time to grow in the market, so we might not see the new Speed3 until something like 2016, with a possible diesel version to arrive before then.

More photos of the 2014 Mazda3 sedan

Thanks to the folks at Top Gear Russia, we got an early glimpse of the 2014 Mazda3 sedan. Now, Mazda has released more images of its sleek new four-door, and if you like what the Japanese automaker has done with the five-door hatchback, you won't find anything to complain about with the sedan.
Many would argue that the Mazda3 sedan looks like a scaled-down version of the new Mazda6, and in many cases, that's true. But there are subtle details about the Mazda3 that we really like, starting with the larger grille that makes for a slightly more aggressive front end. On the profile, we like how the strong arching character lines that flow over the front and rear wheel wells intersect in the middle of the car and then taper off. At the rear, a short decklid rounds off a very clean design with taillamps that are indeed reminiscent of the larger Mazda6.
We can't yet confirm powertrain details (or any other specifications, really), but we fully expect the same 2.0-liter and 2.5-liter Skyactiv-G engines to carry over from the hatchback, as well as the six-speed automatic and manual transmissions.