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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, Mazda, Mitsubishi, Mercedes also under diesel emissions scrutiny

The controversy over Volkswagen's diesel emissions scandal isn't limited to the US. In Europe, where diesel engines are far more popular, the issue is shining a harsh light on the NEDC emissions test. As already known, the evaluation does a poor job of reflecting real-world production of NOx, and it appears a significant number of automakers are affected. The Guardian in the UK has been reporting on real-world test results from a company called Emissions Analytics. After the latest round of checks, vehicles from Mercedes-Benz, Honda, Mazda and Mitsubishi were found to generate far more NOx than they should. The newspaper also published similar results for Renault, Nissan, Hyundai, Fiat, Volvo, Jeep, Citroen, VW, and Audi. On average, the figures are about four times over the limit of producing the pollutant. Unlike VW and its defeat device, these automakers aren't actually breaking the rules. The vehicles perform up to the NEDC lab test for emissions, but those results simply aren't translated to the street. "The VW issue in the US was purely the trigger which threw light on a slightly different problem in the EU - widespread legal over-emissions," Nick Molden from Emissions Analytics said to The Guardian. A big fight to decide the future of this issue appears to be on the horizon. Automakers claim that they can't meet the next round of tightening emissions regulations and are asking for compromises. Although, spokespeople for Mercedes and Honda told The Guardian that the brands would be in favor of the stricter rules. Meanwhile, some European governments began backtracking their support of diesels well before this scandal came to light. The added scrutiny certain hasn't helped the future of the oil-burner. Related Video:

Mazda sketches Koeru concept ahead of Frankfurt show

Mazda is giving us an early peek at the Koeru concept set to debut at the Frankfurt motor show. With a name derived from the Japanese word for "exceed" or "go beyond," the model is the latest evolution in the company's long-lived Kodo design language. Sketches tend to distort a vehicle's actual proportions, and the perspective on this one appears to be playing some visual tricks. Some things can't be hidden so easily, though. The Koeru appears to wear a more sharply angled version of Mazda's shield-shaped grille, and the headlights evolve the look of the CX-3 with an even narrower squint. The steeply raked rear hatch provides a coupe-like roofline, but we wonder if the angle is this pronounced in real life. Reports from last year suggest that a new CX-9 is on the way in 2016, and we could be getting a preview with the Koeru. Mazda is also purportedly developing a CX-7 successor. We should get a better idea if this show car represents either of those future CUVs when we can see it in the metal in Germany. MAZDA TO UNVEIL NEW CROSSOVER CONCEPT IN FRANKFURT Mazda Koeru features a distinctly powerful rendition of the KODO design theme Japanese carmaker aims to further raise benchmark in competitive SUV segment Hiroshima / Leverkusen, 7 August 2015. In a world premiere at the 66th 2015 Frankfurt International Motor Show (IAA), Mazda will reveal the Mazda Koeru, a new crossover SUV concept that makes a bold statement in an increasingly popular and competitive segment. Koeru, Japanese for "exceed" or "go beyond", is a fitting name for Mazda's latest venture into the growing crossover SUV market, where the company is again looking to surpass existing standards and raise the bar for performance, efficiency and overall value. With its formidable KODO – Soul of Motion design, the Koeru expresses the power and vitality of a predator along with a unique level of refined dignity. The full line-up of Mazda's latest SKYACTIV Technology, meanwhile, ensures outstanding dynamic performance, fuel economy and safety with no compromise to Mazda's patented driving fun. The carmaker will also display its new-generation model line-up in Frankfurt. Highlights include an all-new Mazda MX-5 complete with accessories as well as several SKYACTIV powertrains. Mazda's press conference takes place at 13:45 (hall 9.0, B16) on 15 September, the first of two press days. The IAA is open to the public from 17-27 September.