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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.

Honda, Nissan and Mazda recalling 3 million vehicles for airbag inflators

Three million more vehicles can be added to the worldwide tally to be repaired for the faulty airbag inflators supplied by Takata. Honda, Nissan, and Mazda have all issued recalls to replace the bad part, including about 1.2 million of them in North America. NHTSA has been investigating all three companies, plus Chrysler and Toyota, for potentially affected vehicles.
Honda is recalling roughly 1.02 million Civic, CR-V, Odyssey and Element models In North America, built between April 2000 and October 2002. Mazda needs to repair 14,794 units of the RX-8 and Mazda6, and Nissan has 228,000 vehicles in North America to be fixed.
Chrysler is also starting what it calls a "regional field action" to replace the inflators in the 2006 Dodge Charger, according to a company spokesperson. The company says that it has not yet found the problem in any of its vehicles, but it's being done "out of an abundance of caution." The final number of Chargers affected will be announced later this week.

Mazda RX-7 could return in 2020

We like writing about the next Mazda RX-7 because it's like writing about the Chupacabra, Slenderman, or the Florida Skunkape, all of which are imaginary creatures seen by someone who knew someone who had an uncle whose dead great-grandfather's sister took a picture of it, invariably at night, while she was drunk, with her 1933 Kodak Brownie. Autocar is the latest with an RX-7 revival, saying it could come as soon as 2020 to celebrate Mazda's 100th anniversary. Before we get to that, let's take a brief look at RX-7 rumors. In 2009 there was speculation we'd get a concept RX-7 at the Tokyo Motor Show. That same year it was predicted the RX-8 would die to make room for a new RX-7 in 2012. In 2010 Mazda was developing a 300-horsepower rotary for the RX-7 that could run on gasoline or diesel and had better fuel economy and less oil consumption. Then Autocar said we could get the new RX-7 by 2013, a rumor that turned into a new RX-9 based on the Mazda MX-5 Miata platform. In 2012 the potential arrival date had become 2017. In 2013 the company CEO Masamichi Kogai said the equivalent of "Not gonna happen," and he said it again last year, just 90 days ago. It should be clear by now that this car is Mazda's version of the Lotus Esprit. Whew. Now that we're clear on all that, what does Autocar say? That a follow-up to the extinct RX-8 is coming that will sit on the new MX-5 Miata platform, and Mazda's vice president of European R&D said there are still 30 engineers working on rotary engines in partnership with universities. The successor will be front-engined and rear-wheel drive, have either two seats or 2+2 seating, and could be called RX-6, RX-7, or RX-9. That sounds like three distinct statements, only one of which is definitely true, that could possibly just maybe add up to a new RX-7, but could even more likely add up to a rotary-engined concept car that never sees production. We've only got five more years to wait, and since we've been begging at the RX-7 doors this long... Related Video: News Source: Autocar Rumormill Mazda Coupe Performance rotary rotary engine mazda rx-7