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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 Vision Coupe | Tokyo Motor Show's big, sensuous 4-door

Mazda has been making a lot of noise recently about not giving up on the rotary engine. Enough that we started to think it might show a new epitrochoid-engined concept at this year's Tokyo Motor Show. But the brand is nothing if not surprising. Have you driven a CX-5 or a CX-9? Have you noted the real-world fuel economy in a Mazda3? Have you looked at a Miata RF? So instead of trotting out the latest in Wankel weirdness, today in its home market, the Mazda folks pulled the silk off of a stunning full-size four-door design concept, the somewhat inaptly named Vision Coupe. Known mainly for sporty and affordable small(ish) vehicles, Mazda hasn't really had an entry in this category since ... ever. Well, save for the staid and short-lived 929 of the '90s (and the rotary-powered, 7/8-scale Olds Cutlass, JDM-only Roadpacer of the '70s.) As customers flock to crossovers, it's not exactly a category brimming with vitality, at least in the American market — sales of the existing Mazda 6 are down in the States by nearly 25 percent this year, double the market average for cars. And this thing is bigger than that. But the decision is intentional and strategic in Mazda's mission to head upscale and focus on clean design — differentiators from its mass-market Japanese peers. "A big sedan has always been the symbol of a brand going premium. It's the icon of a brand," says Julien Montousse, Mazda North America's director of design. "It tells that Mazda is becoming serious in reaching that goal." Breaking even more conventions, while Mazdas generally are cohesive and well-rendered in their design, you would be hard-pressed to find one quite this sensuous. The Vision Coupe looks like an Aston Martin Rapide that has been placed in a sauna until its body-mass index has whittled down to marathoner levels, and then scalloped and stripped of any unnecessary ornamentation, save for a kind of fingerprinted whorl in its side cove. It is elemental, at once planar and burnished, with the lovely long-hood/short-deck proportions of a classic front-engine, rear-wheel-drive grand tourer. Its interior is similarly edited, doing away with the proliferating screens of other vehicles in the category, utilizing instead a digital analog instrument panel and a sophisticated heads-up display that keeps a driver focused on the road and shows just what is deemed necessary, and nothing else.

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.