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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.

Compact SUV Comparison: Specs, pics and reviews of every brand's crossover

Honda CR-V vs Toyota RAV4. Chevy Equinox vs Ford Escape. Mazda CX-5 vs Subaru Forester. Whichever combinations of compact crossover SUV you're considering, there's probably a comparison test or chart out there to read. Heck, you can even create a three-car comparison yourself here at Autoblog. However, if you want a bunch of that information all in one convenient place, well, here it is. Our mega comparison of specs, features and photos of compact SUV entries from every mainstream manufacturer that sells them. That includes the 2018 Chevrolet Equinox, 2018 Ford Escape, 2018 GMC Terrain, 2018 Honda CR-V, 2018 Hyundai Tucson, 2019 Jeep Cherokee (it's already on sale with notable changes from 2018), 2018 Jeep Compass, 2018 Kia Sportage, 2018 Mazda CX-5, 2018 Mitsubishi Eclipse Cross (none of Mitsu's SUVs are perfect fits for this segment, so we deemed the MEC the most competitive fit), 2018 Nissan Rogue, 2018 Subaru Forester, 2018 Toyota RAV4 and 2018 Volkswagen Tiguan. We can update this comparison as more information about 2019 models is released, most notably the Forester and RAV4. Now, there are certainly some models that are smaller (Nissan Rogue Sport) or larger (Kia Sorento) that could also be considered, but we figured it was wise to stick with those in this sweet spot of comparable size and price. We also included links to Autoblog reviews, buying guides and smaller comparisons. Engines and Transmissions With rare exception, this segment features four-cylinder power. Sometimes it's turbocharged, often its not, but standard engine outputs are generally in the same ballpark. Therefore, we'd recommend focusing on torque output, as it's what will make a difference around town or when passing, and weighing that versus fuel economy (the Chevy Equinox, GMC Terrain, Honda CR-V and Mazda CX-5 make particularly strong cases in this regard). Many drivers aren't too fond of continuously variable transmissions (CVT), either, so that's another thing to consider and note during a test drive. As you can see, several models are available with performance upgrades. Besides the Jeep Cherokee's available V6, all are more powerful turbocharged four-cylinder engines. The exception to this would be the Honda CR-V and Ford Escape, as their 1.5-liter turbo engines don't prioritize performance. Instead, they serve as overall upgrades to the base naturally aspirated engines standard on only their base trim levels (CR-V LX and Escape S).

2018 Mazda CX-5 spied testing in Southern California

It appears the replacement for the Mazda CX-5 is on its way. The current model, though a few years old at this point, is still one of our favorite crossovers on the market. Its combination of handsome styling, practicality, and a genuine fun-to-drive nature make it a winner in our hearts. Hopefully this new model doesn't stray too far from that winning recipe. At least on the outside, that seems to be the case. The spy photos reveal Mazda's Kodo design language in full bloom. The general shape is the same as the current model, but the curves are a little tighter and appear similar to the new CX-9 and Chinese-only CX-4. The grille loses the horizontal bars for a deep-set mesh pattern, while the whole fascia appears to be more upright. The headlights and taillights look to be slimmer and slightly re-sculpted versions of the current shape. Other details for the upcoming CX-5 are scarce. The crossover is expected to debut next year as a 2018 model. It's unknown what engines or transmissions will be available, though the current powertrains are likely to carry over. There's also the rumor of a Mazda diesel making its way over, but, as always, it seems like a long shot. Related Video: