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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.

Lucid Air and Maserati MC20 unveiled | Autoblog Podcast #644

In this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Associate Editor Byron Hurd. Before they get to the juicy news of the week, they chat about the cars they've been driving, including a Ford Mustang Shelby GT350R, Audi A6 Allroad, Mazda CX-9 and Kia Niro. It's been a busy week in the news department, with GM investing in Nikola, Lucid Motors launching the Air electric sedan, Maserati unveiling the MC20 mid-engined supercar and a farewell to the Lexus GS. Then they talk about having a newfound respect for the Fox Body Mustang and the Mazda CX-9. Autoblog Podcast #644 Get The Podcast iTunes – Subscribe to the Autoblog Podcast in iTunes RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown Cars we're driving 2020 Ford Mustang Shelby GT350R 2020 Audi A6 Allroad 2020 Mazda CX-9 2020 Kia Niro GM buys $2 billion stake in Nikola, will build Badger hydrogen-electric pickup Update: Short-seller accuses Nikola of fraud and Nikola threatens to sue Lucid Air production electric luxury sedan is a dream revealed Lucid Air's modular powertrain opens up serious performance possibilities Lucid Motors teases electric SUV at Air debut Mid-engined, 621-horsepower MC20 inaugurates a new era for Maserati All future Maseratis will borrow styling cues from the MC20  2023 Maserati MC20 Folgore planned with three-motor electric powertrain Lexus GS dead for 2021 Respect to: Fox Body Mustang Mazda CX-9 Feedback Email – Podcast@Autoblog.com Review the show on iTunes Related Video:

Junkyard Gem: 1981 Mazda RX-7

The first-generation Mazda RX-7 was sold for the 1978 through 1985 model years, and for decades you'd see and hear these nimble little sports cars buzzing around American streets. Then, well, the apex seals went out, or owners tired of a 2,400-pound car that drank fuel like an Eldorado, or the floor pans were eaten by the Rust Monster... and then nearly all of them were gone. Enough of them remain, however, for a steady trickle to show up with depressing regularity in self-service wrecking yards. Here's a pretty solid '81 that I found in a Denver yard last month. The 12A Wankel engine in this car made 100 hp and 105 lb-ft of torque, which was very good for 1981 (considering that you could buy a new Camaro with a 115-horsepower V8 that year). The $9,385 RX-7 looked like an especially good value when compared to, say, the $11,299 Datsun 280ZX or the $8,997 Fiat 124 Sport Spider, being much lighter on its feet than the former and much quicker than the latter. View 12 Photos If you have ever considered getting one of these cars, move fast before all the restorable ones are gone! Auto News Mazda Automotive History mazda rx-7