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Mazda patent shows rotary placement in complex AWD hybrid layout

If we were playing alt-powertrain Bingo, a recent Mazda patent application filed in Japan would be one or two letters from victory. What's exciting about the patent, discovered by Japanese outlet T's Media via Motor Trend, is that while it makes a case for an internal combustion engine of any configuration, one of the drawings showing a rotary engine. The wild bit is that the whole powertrain comprises the ICE, a transaxle, two tiny in-wheel electric motors turning the front wheels, a third electric motor in the driveline, a capacitor, a lithium-ion battery, and three inverters. Motor Trend parsed the mechanics, and the way it reads, Doc Brown couldn't have done a better job. The rotary engine at the front turns the rear wheels, but not directly. Instead of a flywheel on back of the engine, the drawing shows a 25-kW electric motor and an inverter, then a driveshaft running to the transaxle. Along the axis of the transmission tunnel in a normal car, between the inverter and the transaxle, lies a 3.5-kWh battery running at 48 volts. MT writes that the electric motor can add its output to the ICE output to drive the rear wheels, or the e-motor can turn the rear axle on its own. Up front, two inverters and a double-layer capacitor join the ICE in the engine bay. The capacitor and tiny hub motors in the front wheels run at 120 volts, a higher voltage than the rest of the electrical system, so that the small in-wheel motors can generate the same torque as a larger motor running at a lower voltage. The AWD system acts on-demand. Given the signal, the capacitors discharge their energy to the wheel motors, and recover energy from braking. When the capacitors are at full charge, they send excess regen energy to the lithium-ion battery; conversely, the battery can recharge the capacitors when they're low and the front hub motors need power. The patent explains that the ICE works with the rear e-motor to drive the rear wheels at low speeds, the front motors called on to "generate an output only when a large output is required in the high vehicle speed range." The rather complicated system is focused on providing the benefits of a hybrid system and all-wheel drive, but at lower weight than one would expect. A rotary serves due to its compactness, but one of the drawings shows an engine with a V layout. Hub motors get dinged for adding unsprung weight, hence the small motors here.

Mazda files patents for a sequential twin-turbo setup

Mazda has a history of interesting engine technologies, from yesterday's rotary engine to tomorrow's compression ignition engine, and new patents show it still may have some internal combustion tricks up its sleeve. The one on display in these patents isn't especially new in concept, though. A sequential twin-turbocharger setup is something Mazda itself used on the third-generation RX-7. But it's something we haven't seen much of lately. It looks like it could have some possible advantages over older sequential systems, and it has some potential advantages for enthusiasts. First a quick and dirty primer for what makes a sequential twin-turbo system distinct from other twin-turbo systems. In many twin-turbo engines, there are simply two turbos that work together as one bigger turbo. They're the same size, and they spool up at the same time. With a sequential setup, at low rpm, a smaller turbocharger is spooled up first at low-rpm for quicker throttle response, and as the rpm and exhaust pressure increases, a valve opens up that allows a larger turbocharger to also spool up and provide high-rpm boost. That's basically how the Mazda design shown above functions. A big flap blocks off the larger turbocharger exhaust inlet, channeling all the exhaust to the smaller turbo. When more exhaust is available at high rpm, it looks like that flap opens up to spool up the big turbo, too. What's interesting here is that the way the turbochargers are packaged takes up less space than past systems. It looks like both turbos are contained in one unit that shares the same exhaust outlet, meaning the exhaust manifold could be kept simple and compact. In fact, the piping for compressed intake air could also be shared, reducing the amount of piping, which would further decrease the amount of materials and possible failure points. There are a number advantages of making this system smaller. The potential applications of the system are much greater, since it could fit in smaller cars with smaller engine bays. Making the system smaller also means that there won't be as much weight, which is important from both fuel economy and performance standpoints. Finally, the smaller setup likely uses fewer materials, which could make the system cheaper and thus easier to offer on a wider range of vehicles, or at least more profitable for Mazda.

Mazda2 refreshed for 2020 with new style and tech

The North American market Toyota Yaris is a badge engineered version of the Mazda 2. Now, the Mazda underneath the Toyota badging has received some updates in its home market of Japan, and it will be interesting to see if or when the U.S. counterpart will be refreshed with any of these updates. The 2020 Mazda 2, now indeed called "Mazda 2" instead of the older Demio name on the Japanese market, has received new front end styling to bring it in line with bigger Mazda models. The grille and bumper are new, as are the headlights with adaptive LED technology and LED daytime running lights. Apparently the headlights are constructed out of 20 individually controlled LED blocks to optimize light output and direction, which sounds awfully interesting for this class of vehicle. The front end design, just like the new 16-inch alloy wheels, is Mazda-specific and the Yarisized version is unlikely to benefit from them, especially since the headlights are also different on the Toyota. Cabin materials have also been updated, and the driver’s seat is available with six-way power adjustability for 2020. The MZD Connect infotainment has Apple Carplay and Android Auto support, like the Yaris setup. In addition, cabin comfort is said to have been improved with better soundproofing, which is sometimes sorely needed in this class of cars. Safety and convenience features include adaptive cruise control, which is impressive on a city car, and the Mazda 2 also has the G-Vectoring Control Plus system for high-speed stability. Both the diesel and gasoline versions will get Mazda's i-Eloop brake energy regeneration system. The Japanese market also gets an all-wheel-drive version, which is surely a hoot despite only being available with the automatic transmission. CarAdvice says the Australian market will receive the redesigned Mazda 2 early next year, which is probably in line with the rest of the global market that gets it as a Mazda instead of a Toyota; Mazda says Japan market pre-orders have started today and official sales will begin on September 12th. It pays to remember that the base car dates back to 2014, and that the 2020 refresh is a facelift instead of a ground-up redesign. Assuming the usually expected shelf-life for the facelifted edition, the 2 will have racked up respectable mileage from the “DJ” generation bodyshell.